The Experts below are selected from a list of 8412 Experts worldwide ranked by ideXlab platform

N J Curro - One of the best experts on this subject based on the ideXlab platform.

  • measurements of the nmr Knight Shift tensor and nonlinear magnetization in uru2si2
    Physical Review B, 2018
    Co-Authors: M Lawson, Blaine Bush, T Kissikov, Z Brubaker, K R Shirer, J R Jeffries, Sheng Ran, Inho Jeon, M B Maple, N J Curro
    Abstract:

    URu$_2$Si$_2$ exhibits an anomalous peak in the nonlinear magnetic susceptibility at the hidden order transition. In order to investigate this anomaly, we conducted direct magnetization measurements and investigated the detailed angular dependence of the $^{29}$Si nuclear magnetic resonance Knight Shift tensor. We find that the nonlinear magnetization is smaller than previously reported, and the analogous nonlinear Knight Shift tensor is below the detection limit. Our results suggest that the magnitude of the anomalous peak is sample dependent.

  • universal Knight Shift anomaly in the periodic anderson model
    Physical Review B, 2014
    Co-Authors: M Jiang, N J Curro, R T Scalettar
    Abstract:

    Here, we report a Determinant Quantum Monte Carlo investigation which quantifies the behavior of the susceptibility and the entropy in the framework of the periodic Anderson model (PAM), focussing on the evolution with different degree of conduction electron (c) -local moment (f) hybridization. These results capture the behavior observed in several experiments, including the universal behavior of the NMR Knight Shift anomaly below the crossover temperature, T*. We find that T* is a measure of the onset of c-f correlations and grows with increasing hybridization. Our results suggest that the NMR Knight Shift and spin-lattice relaxation rate measurements in non-Fermi liquid materials are strongly influenced by temperature-dependent hybridization processes. Furthermore, our results provide a microscopic basis for the phenomenological two-fluid model of Kondo lattice behavior, and its evolution with pressure and temperature.

  • nmr investigation of the Knight Shift anomaly in ceirin 5 at high magnetic fields
    Physical Review B, 2013
    Co-Authors: A C Shockley, N Aprobertswarren, D M Nisson, P L Kuhns, A P Reyes, S Yuan, N J Curro
    Abstract:

    We report nuclear magnetic resonance Knight Shift data in the heavy fermion material CeIrIn5 at fields up to 30 T. The Knight Shift of the In displays a strong anomaly, and we analyze the results using two different interpretations. We find that the Kondo lattice coherence temperature and the effective mass of the heavy electrons remains largely unaffected by the magnetic field, despite the fact that the Zeeman energy is on the order of the coherence temperature.

K. Niedźwiedź - One of the best experts on this subject based on the ideXlab platform.

  • Titanium Knight Shift in Ti1−x Vx (0 ⩽ × ⩽ 0.65) dihydrides
    Journal of Alloys and Compounds, 1992
    Co-Authors: B. Nowak, O.j. Źogał, K. Niedźwiedź
    Abstract:

    Abstract The titanium Knight Shifts have been measured in the cubic and tetragonal phases of TiH 2 in the 155–320 K temperature range. The anisotropy of the Knight Shift tensor of 49 Ti resonance in the tetragonal phase was determined. The axial Knight Shift K ax which was equal to +0.0087±0.0005% at 155 K decreased to +0.0050±0.0005% at 250 K. The titanium Knight Shifts in nearly stoichiometric dihydrides of Ti 1−x V x (0.04⩽ × ⩽ 0.65) alloys were measured at room temperature. They have decreased from K =0.245±0.002% for pure TiH 2 ( x =0) to K =0.11±0.01% in Ti 0.35 V 0.65 H ≈2 . These changes are discussed in terms of the changes in the magnetic susceptibilities in these materials.

Tomoki Machida - One of the best experts on this subject based on the ideXlab platform.

  • spatial distribution of Knight Shift around quantum hall edge channels using resistively detected nmr
    International Journal of Modern Physics B, 2007
    Co-Authors: Satoru Masubuchi, K Hamaya, Tomoki Machida
    Abstract:

    We develop a method for studying spatial distribution of the Knight Shift using resistively-detected nuclear magnetic resonance (NMR) in an AlGaAs/GaAs quantum Hall device. By controlling the position of the dynamic nuclear polarization with the side-gate voltage, the spatial distribution of the NMR spectrum is investigated in a vicinity of quantum Hall edge channels. The value of Knight Shift gradually changes in the region where the local Landau-level filling factor is between ν = 1 and ν = 2, implying that the change of the local electron spin polarization is detected in the edge channel.

  • local detection of Knight Shift around quantum hall edge channels using resistively detected nmr
    Physica Status Solidi (c), 2006
    Co-Authors: Satoru Masubuchi, K Hamaya, Tomoki Machida
    Abstract:

    We develop a method for the observation of the Knight Shift in nanometer-scale region in semiconductors using resistively detected nuclear magnetic resonance (RDNMR) in quantum Hall edge channels. Using a gate-induced decoupling of the hyperfine interaction between electron and nuclear spins, we obtain the RD-NMR spectra with and without the electron-nuclear spin coupling. By comparing these two NMR spectra, we obtain the values of the Knight Shift for the nuclear spins polarized dynamically in the region between the relevant edge channels. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

B. Nowak - One of the best experts on this subject based on the ideXlab platform.

  • Titanium Knight Shift in Ti1−x Vx (0 ⩽ × ⩽ 0.65) dihydrides
    Journal of Alloys and Compounds, 1992
    Co-Authors: B. Nowak, O.j. Źogał, K. Niedźwiedź
    Abstract:

    Abstract The titanium Knight Shifts have been measured in the cubic and tetragonal phases of TiH 2 in the 155–320 K temperature range. The anisotropy of the Knight Shift tensor of 49 Ti resonance in the tetragonal phase was determined. The axial Knight Shift K ax which was equal to +0.0087±0.0005% at 155 K decreased to +0.0050±0.0005% at 250 K. The titanium Knight Shifts in nearly stoichiometric dihydrides of Ti 1−x V x (0.04⩽ × ⩽ 0.65) alloys were measured at room temperature. They have decreased from K =0.245±0.002% for pure TiH 2 ( x =0) to K =0.11±0.01% in Ti 0.35 V 0.65 H ≈2 . These changes are discussed in terms of the changes in the magnetic susceptibilities in these materials.

A. Schenck - One of the best experts on this subject based on the ideXlab platform.

  • Muon Knight Shift and μ + site in the monopnictide CeAs
    Hyperfine Interactions, 1997
    Co-Authors: A. Schenck, F. N. Gygax, Alex Amato, M. Pinkpank, H. R. Ott
    Abstract:

    The transverse field μSR-signal from μ+ implanted in a CeAs single crystal shows a splitting into two components, displaying a positive and a negative Knight Shift, respectively which both scale reasonably well with the magnetic bulk susceptibility above 10 K. The orientation dependence of the frequency Shifts, measured at 15 K, is fully accounted for by the demagnetization field, implying an isotropic Knight Shift, consistent with the μ+ residing at the only interstitial site of high (cubic) symmetry, i.e., at the position (1/4,1/4,1/4). The occurrence of a split signal remains unexplained.

  • pressure induced collapse of the 4f electron induced μ Knight Shift in sm0 9la0 1s
    Hyperfine Interactions, 1997
    Co-Authors: A. Schenck, F. N. Gygax, M. Pinkpank, A Amato, A Jung, P Wachter, J Major, Th Stammler, R Scheuermann
    Abstract:

    The pressure dependence of the μ+-Knight Shift in the pseudo‐binary compound Sm0.9La0.1S has been studied with the aim to verify microscopically the quenching of paramagnetism by the formation and condensation of excitons in the insulating regime. A collapse of the μ+-Knight Shift is indeed observed but it is not restricted to the insulating phase and may not reflect the bulk‐magnetic response.