The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
R I Miller - One of the best experts on this subject based on the ideXlab platform.
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penetration depth and Core Radius μsr measurements in the vortex state near the lower critical field
Physica B-condensed Matter, 2003Co-Authors: R I Miller, R F Kiefl, J H Brewer, S R Dunsiger, J C Chakhalian, A N PriceAbstract:Abstract μSR measurements of the magnetic field distribution in the high-Tc superconductor YBa2Cu3O6+x and conventional superconductor NbSe2 near the lower critical field are presented. The muon spin polarization signal is analyzed in terms of a Ginzburg–Landau (GL) field distribution. Our analysis reveals that the increase in the vortex Core Radius levels off below μ 0 H=0.05 T in underdoped YBa2Cu3O6+x and the penetration depth stops decreasing. We find that λ=2000 A in YBa2Cu3O6.50, λ=1850 A in YBa2Cu3O6.67, and λ=1600 A in NbSe2. At still lower external magnetic fields, the GL field distribution no longer fits the μSR signal, likely due to a transition to the Meissner state.
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nonlocal effects and shrinkage of the vortex Core Radius in yni2b2c probed by muon spin rotation
Physical Review B, 2002Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:The magnetic field distribution in the vortex state of ${\mathrm{YNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ has been probed by muon spin rotation. The analysis based on the London model with nonlocal corrections shows that the vortex lattice has changed from hexagonal to square with increasing magnetic field H. At low fields the vortex Core Radius, ${\ensuremath{\rho}}_{v}(H),$ decreases with increasing H much steeper than what is expected from the $\sqrt{H}$ behavior of the Sommerfeld constant $\ensuremath{\gamma}(H),$ strongly suggesting that the anomaly in $\ensuremath{\gamma}(H)$ primarily arises from the quasiparticle excitations outside the vortex Cores.
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nonlocal effects and shrinkage of the vortex Core Radius in yni2b2c probed by musr
Physical Review B, 2002Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:The magnetic field distribution in the vortex state of YNi2B2C has been probed by muon spin rotation (muSR). The analysis based on the London model with nonlocal corrections shows that the vortex lattice has changed from hexagonal to square with increasing magnetic field H. At low fields the vortex Core Radius, rho_v(H), decreases with increasing H much steeper than what is expected from the sqrt(H) behavior of the Sommerfeld constant gamma(H), strongly suggesting that the anomaly in gamma(H) primarily arises from the quasiparticle excitations outside the vortex Cores.
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low temperature limit of the vortex Core Radius and the kramer pesch effect in nbse2
Physical Review Letters, 2000Co-Authors: R I Miller, R F Kiefl, J E Sonier, J H Brewer, J Chakhalian, S R Dunsiger, G D Morris, W A MacfarlaneAbstract:Muon spin rotation ({mu}SR ) has been used to measure the magnetic field distribution in the vortex state of the type-II superconductor NbSe{sub 2} (T{sub c}=7.0 K ) below T=2 K . The distribution is consistent with a highly ordered hexagonal vortex lattice with a well resolved high-field cutoff associated with the finite size of the vortex Cores. The temperature dependence of the Core Radius is much weaker than the temperature dependence predicted from the Bogoliubov-de Gennes theory. Furthermore, the vortex Radius measured by {mu}SR near the low temperature quantum limit is about an order of magnitude larger than predicted. (c) 2000 The American Physical Society.
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anomalous field dependence of the vortex Core Radius and magnetic penetration depth in yni2b2c probed by μsr
Physica B-condensed Matter, 2000Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:Abstract Muon spin rotation measurements were performed to deduce the magnetic penetratioin depth λ and vortex Core Radius ρv in the mixed state of YNi2B2C for H c 1 ⪡H≦0.7 H c 2 . A preliminary analysis based on the modified London model shows that ρv decreases steeply with increasing H, while λ increases linearly in H.
R F Kiefl - One of the best experts on this subject based on the ideXlab platform.
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penetration depth and Core Radius μsr measurements in the vortex state near the lower critical field
Physica B-condensed Matter, 2003Co-Authors: R I Miller, R F Kiefl, J H Brewer, S R Dunsiger, J C Chakhalian, A N PriceAbstract:Abstract μSR measurements of the magnetic field distribution in the high-Tc superconductor YBa2Cu3O6+x and conventional superconductor NbSe2 near the lower critical field are presented. The muon spin polarization signal is analyzed in terms of a Ginzburg–Landau (GL) field distribution. Our analysis reveals that the increase in the vortex Core Radius levels off below μ 0 H=0.05 T in underdoped YBa2Cu3O6+x and the penetration depth stops decreasing. We find that λ=2000 A in YBa2Cu3O6.50, λ=1850 A in YBa2Cu3O6.67, and λ=1600 A in NbSe2. At still lower external magnetic fields, the GL field distribution no longer fits the μSR signal, likely due to a transition to the Meissner state.
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nonlocal effects and shrinkage of the vortex Core Radius in yni2b2c probed by muon spin rotation
Physical Review B, 2002Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:The magnetic field distribution in the vortex state of ${\mathrm{YNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ has been probed by muon spin rotation. The analysis based on the London model with nonlocal corrections shows that the vortex lattice has changed from hexagonal to square with increasing magnetic field H. At low fields the vortex Core Radius, ${\ensuremath{\rho}}_{v}(H),$ decreases with increasing H much steeper than what is expected from the $\sqrt{H}$ behavior of the Sommerfeld constant $\ensuremath{\gamma}(H),$ strongly suggesting that the anomaly in $\ensuremath{\gamma}(H)$ primarily arises from the quasiparticle excitations outside the vortex Cores.
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nonlocal effects and shrinkage of the vortex Core Radius in yni2b2c probed by musr
Physical Review B, 2002Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:The magnetic field distribution in the vortex state of YNi2B2C has been probed by muon spin rotation (muSR). The analysis based on the London model with nonlocal corrections shows that the vortex lattice has changed from hexagonal to square with increasing magnetic field H. At low fields the vortex Core Radius, rho_v(H), decreases with increasing H much steeper than what is expected from the sqrt(H) behavior of the Sommerfeld constant gamma(H), strongly suggesting that the anomaly in gamma(H) primarily arises from the quasiparticle excitations outside the vortex Cores.
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low temperature limit of the vortex Core Radius and the kramer pesch effect in nbse2
Physical Review Letters, 2000Co-Authors: R I Miller, R F Kiefl, J E Sonier, J H Brewer, J Chakhalian, S R Dunsiger, G D Morris, W A MacfarlaneAbstract:Muon spin rotation ({mu}SR ) has been used to measure the magnetic field distribution in the vortex state of the type-II superconductor NbSe{sub 2} (T{sub c}=7.0 K ) below T=2 K . The distribution is consistent with a highly ordered hexagonal vortex lattice with a well resolved high-field cutoff associated with the finite size of the vortex Cores. The temperature dependence of the Core Radius is much weaker than the temperature dependence predicted from the Bogoliubov-de Gennes theory. Furthermore, the vortex Radius measured by {mu}SR near the low temperature quantum limit is about an order of magnitude larger than predicted. (c) 2000 The American Physical Society.
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anomalous field dependence of the vortex Core Radius and magnetic penetration depth in yni2b2c probed by μsr
Physica B-condensed Matter, 2000Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:Abstract Muon spin rotation measurements were performed to deduce the magnetic penetratioin depth λ and vortex Core Radius ρv in the mixed state of YNi2B2C for H c 1 ⪡H≦0.7 H c 2 . A preliminary analysis based on the modified London model shows that ρv decreases steeply with increasing H, while λ increases linearly in H.
J E Sonier - One of the best experts on this subject based on the ideXlab platform.
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nonlocal effects and shrinkage of the vortex Core Radius in yni2b2c probed by muon spin rotation
Physical Review B, 2002Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:The magnetic field distribution in the vortex state of ${\mathrm{YNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ has been probed by muon spin rotation. The analysis based on the London model with nonlocal corrections shows that the vortex lattice has changed from hexagonal to square with increasing magnetic field H. At low fields the vortex Core Radius, ${\ensuremath{\rho}}_{v}(H),$ decreases with increasing H much steeper than what is expected from the $\sqrt{H}$ behavior of the Sommerfeld constant $\ensuremath{\gamma}(H),$ strongly suggesting that the anomaly in $\ensuremath{\gamma}(H)$ primarily arises from the quasiparticle excitations outside the vortex Cores.
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nonlocal effects and shrinkage of the vortex Core Radius in yni2b2c probed by musr
Physical Review B, 2002Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:The magnetic field distribution in the vortex state of YNi2B2C has been probed by muon spin rotation (muSR). The analysis based on the London model with nonlocal corrections shows that the vortex lattice has changed from hexagonal to square with increasing magnetic field H. At low fields the vortex Core Radius, rho_v(H), decreases with increasing H much steeper than what is expected from the sqrt(H) behavior of the Sommerfeld constant gamma(H), strongly suggesting that the anomaly in gamma(H) primarily arises from the quasiparticle excitations outside the vortex Cores.
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low temperature limit of the vortex Core Radius and the kramer pesch effect in nbse2
Physical Review Letters, 2000Co-Authors: R I Miller, R F Kiefl, J E Sonier, J H Brewer, J Chakhalian, S R Dunsiger, G D Morris, W A MacfarlaneAbstract:Muon spin rotation ({mu}SR ) has been used to measure the magnetic field distribution in the vortex state of the type-II superconductor NbSe{sub 2} (T{sub c}=7.0 K ) below T=2 K . The distribution is consistent with a highly ordered hexagonal vortex lattice with a well resolved high-field cutoff associated with the finite size of the vortex Cores. The temperature dependence of the Core Radius is much weaker than the temperature dependence predicted from the Bogoliubov-de Gennes theory. Furthermore, the vortex Radius measured by {mu}SR near the low temperature quantum limit is about an order of magnitude larger than predicted. (c) 2000 The American Physical Society.
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anomalous field dependence of the vortex Core Radius and magnetic penetration depth in yni2b2c probed by μsr
Physica B-condensed Matter, 2000Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:Abstract Muon spin rotation measurements were performed to deduce the magnetic penetratioin depth λ and vortex Core Radius ρv in the mixed state of YNi2B2C for H c 1 ⪡H≦0.7 H c 2 . A preliminary analysis based on the modified London model shows that ρv decreases steeply with increasing H, while λ increases linearly in H.
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muon spin rotation measurements of the magnetic field dependence of the vortex Core Radius and magnetic penetration depth in nbse2
Physical Review Letters, 1997Co-Authors: J E Sonier, R I Miller, R F Kiefl, J H Brewer, J Chakhalian, S R Dunsiger, W A Macfarlane, A Wong, G M Luke, J W BrillAbstract:Muon-spin rotation spectroscopy ({mu}SR) has been used to measure the internal magnetic field distribution in NbSe{sub 2} for H{sub c1}{lt}H{lt}0.25H{sub c2} . The deduced profiles of the supercurrent density J{sub s} indicate that the vortex-Core Radius {rho}{sub 0} in the bulk decreases sharply with increasing magnetic field. This effect, which is attributed to increased vortex-vortex interactions, does not agree with the dirty-limit microscopic theory. A simple phenomenological equation in which {rho}{sub 0} depends on the intervortex spacing is used to model this behavior. In addition, we find for the first time that the in-plane magnetic penetration depth {lambda}{sub ab} increases linearly with H in the vortex state of a conventional superconductor. {copyright} {ital 1997} {ital The American Physical Society}
Minoru Nohara - One of the best experts on this subject based on the ideXlab platform.
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nonlocal effects and shrinkage of the vortex Core Radius in yni2b2c probed by muon spin rotation
Physical Review B, 2002Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:The magnetic field distribution in the vortex state of ${\mathrm{YNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ has been probed by muon spin rotation. The analysis based on the London model with nonlocal corrections shows that the vortex lattice has changed from hexagonal to square with increasing magnetic field H. At low fields the vortex Core Radius, ${\ensuremath{\rho}}_{v}(H),$ decreases with increasing H much steeper than what is expected from the $\sqrt{H}$ behavior of the Sommerfeld constant $\ensuremath{\gamma}(H),$ strongly suggesting that the anomaly in $\ensuremath{\gamma}(H)$ primarily arises from the quasiparticle excitations outside the vortex Cores.
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nonlocal effects and shrinkage of the vortex Core Radius in yni2b2c probed by musr
Physical Review B, 2002Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:The magnetic field distribution in the vortex state of YNi2B2C has been probed by muon spin rotation (muSR). The analysis based on the London model with nonlocal corrections shows that the vortex lattice has changed from hexagonal to square with increasing magnetic field H. At low fields the vortex Core Radius, rho_v(H), decreases with increasing H much steeper than what is expected from the sqrt(H) behavior of the Sommerfeld constant gamma(H), strongly suggesting that the anomaly in gamma(H) primarily arises from the quasiparticle excitations outside the vortex Cores.
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anomalous field dependence of the vortex Core Radius and magnetic penetration depth in yni2b2c probed by μsr
Physica B-condensed Matter, 2000Co-Authors: K Ohishi, K Kakuta, Jun Akimitsu, W Higemoto, R Kadono, R I Miller, A N Price, R F Kiefl, J E Sonier, Minoru NoharaAbstract:Abstract Muon spin rotation measurements were performed to deduce the magnetic penetratioin depth λ and vortex Core Radius ρv in the mixed state of YNi2B2C for H c 1 ⪡H≦0.7 H c 2 . A preliminary analysis based on the modified London model shows that ρv decreases steeply with increasing H, while λ increases linearly in H.
W A Macfarlane - One of the best experts on this subject based on the ideXlab platform.
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low temperature limit of the vortex Core Radius and the kramer pesch effect in nbse2
Physical Review Letters, 2000Co-Authors: R I Miller, R F Kiefl, J E Sonier, J H Brewer, J Chakhalian, S R Dunsiger, G D Morris, W A MacfarlaneAbstract:Muon spin rotation ({mu}SR ) has been used to measure the magnetic field distribution in the vortex state of the type-II superconductor NbSe{sub 2} (T{sub c}=7.0 K ) below T=2 K . The distribution is consistent with a highly ordered hexagonal vortex lattice with a well resolved high-field cutoff associated with the finite size of the vortex Cores. The temperature dependence of the Core Radius is much weaker than the temperature dependence predicted from the Bogoliubov-de Gennes theory. Furthermore, the vortex Radius measured by {mu}SR near the low temperature quantum limit is about an order of magnitude larger than predicted. (c) 2000 The American Physical Society.
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Muon spin rotation measurement of the fundamental length scales in the vortex state of YBa2Cu3O6.60
Physical Review Letters, 1997Co-Authors: Jeff Sonier, R I Miller, J H Brewer, W A Macfarlane, Robert F. Kiefl, D. A. Bonn, Sarah Dunsiger, Walter Hardy, Ruixing Liang, T. M. RisemanAbstract:The internal field distribution in the vortex state of YBa2Cu3O6.60 is shown to be a sensitive measure of both the magnetic penetration depth and the vortex-Core Radius. The temperature dependence of the vortex Core Radius is found to be weaker than in the conventional superconductor NbSe2 and much weaker than theoretical predictions for an isolated vortex. The effective vortex-Core Radius decreases sharply with increasing H, whereas the penetration depth is found to be much stronger than in NbSe2.
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muon spin rotation measurements of the magnetic field dependence of the vortex Core Radius and magnetic penetration depth in nbse2
Physical Review Letters, 1997Co-Authors: J E Sonier, R I Miller, R F Kiefl, J H Brewer, J Chakhalian, S R Dunsiger, W A Macfarlane, A Wong, G M Luke, J W BrillAbstract:Muon-spin rotation spectroscopy ({mu}SR) has been used to measure the internal magnetic field distribution in NbSe{sub 2} for H{sub c1}{lt}H{lt}0.25H{sub c2} . The deduced profiles of the supercurrent density J{sub s} indicate that the vortex-Core Radius {rho}{sub 0} in the bulk decreases sharply with increasing magnetic field. This effect, which is attributed to increased vortex-vortex interactions, does not agree with the dirty-limit microscopic theory. A simple phenomenological equation in which {rho}{sub 0} depends on the intervortex spacing is used to model this behavior. In addition, we find for the first time that the in-plane magnetic penetration depth {lambda}{sub ab} increases linearly with H in the vortex state of a conventional superconductor. {copyright} {ital 1997} {ital The American Physical Society}