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Gary S Collins - One of the best experts on this subject based on the ideXlab platform.
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nuclear quadrupole interactions of 111in cd solute atoms in a series of rare earth palladium alloys
Hyperfine Interactions, 2013Co-Authors: Qiaoming Wang, Gary S CollinsAbstract:Nuclear quadrupole interactions were measured at 111In/Cd probe atoms in rare-earth palladium phases RPd3 having the L12 structure using the technique of perturbed angular correlation of gamma rays (PAC). Measurements were made for pairs of samples having compositions of the Pd-poorer and Pd-rich boundaries of the RPd3 phase fields, typically 75 and 78 at.% Pd. Two signals were detected in most phases, corresponding to probe atoms on cubic R- and non-cubic Pd-Sublattices. Site preferences of parent In-probe atoms were characterized by site-fractions of probes on the R- and Pd-Sublattices. For all Pd-rich samples, probes exclusively occupied the R-Sublattice, consistent with a heuristic rule that solute atoms tend to occupy the Sublattice of an element in which there is a deficiency. For Pd-poorer alloys with R = Tb, Er, Yb, Lu, Y and Sc, probes exclusively occupied the Pd-Sublattice. For Pd-poorer alloys with R = Ce, Pr, Nd, Sm and Eu, probes occupied both Sublattices, with site fractions varying as a function of temperature. In contrast, probes only occupied the R-Sublattice in Pd-poorer LaPd3. Jump frequencies on the Pd-Sublattice of daughter Cd-probes were determined from nuclear relaxation caused by fluctuating electric field gradients. Activation enthalpies for diffusional jumps were determined from temperature dependences and found to increase linearly as the lattice parameter decreases along the series Pr, Nd, Eu and Sm. Jump frequencies are believed to have been even higher in CePd3 than in PrPd3, but were too low to be detectable in Tb, Er, Yb, Lu, Y and Sc palladides. A correlation between site preferences and jump frequencies is noted and discussed. This paper provides a complete account of measurements of jump frequencies of Cd-probe atoms and comparisons with similar measurements made on other series of L12 phases.
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nuclear quadrupole interactions of 111in cd solute atoms in a series of rare earth palladium alloys
Hyperfine Interactions, 2013Co-Authors: Qiaoming Wang, Gary S CollinsAbstract:Nuclear quadrupole interactions were measured at 111In/Cd probe atoms in rare-earth palladium phases RPd3 having the L12 structure using the technique of perturbed angular correlation of gamma rays (PAC). Measurements were made for pairs of samples having compositions of the Pd-poorer and Pd-rich boundaries of the RPd3 phase fields, typically 75 and 78 at.% Pd. Two signals were detected in most phases, corresponding to probe atoms on cubic R- and non-cubic Pd-Sublattices. Site preferences of parent In-probe atoms were characterized by site-fractions of probes on the R- and Pd-Sublattices. For all Pd-rich samples, probes exclusively occupied the R-Sublattice, consistent with a heuristic rule that solute atoms tend to occupy the Sublattice of an element in which there is a deficiency. For Pd-poorer alloys with R = Tb, Er, Yb, Lu, Y and Sc, probes exclusively occupied the Pd-Sublattice. For Pd-poorer alloys with R = Ce, Pr, Nd, Sm and Eu, probes occupied both Sublattices, with site fractions varying as a function of temperature. In contrast, probes only occupied the R-Sublattice in Pd-poorer LaPd3. Jump frequencies on the Pd-Sublattice of daughter Cd-probes were determined from nuclear relaxation caused by fluctuating electric field gradients. Activation enthalpies for diffusional jumps were determined from temperature dependences and found to increase linearly as the lattice parameter decreases along the series Pr, Nd, Eu and Sm. Jump frequencies are believed to have been even higher in CePd3 than in PrPd3, but were too low to be detectable in Tb, Er, Yb, Lu, Y and Sc palladides. A correlation between site preferences and jump frequencies is noted and discussed. This paper provides a complete account of measurements of jump frequencies of Cd-probe atoms and comparisons with similar measurements made on other series of L12 phases.
Qiaoming Wang - One of the best experts on this subject based on the ideXlab platform.
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nuclear quadrupole interactions of 111in cd solute atoms in a series of rare earth palladium alloys
Hyperfine Interactions, 2013Co-Authors: Qiaoming Wang, Gary S CollinsAbstract:Nuclear quadrupole interactions were measured at 111In/Cd probe atoms in rare-earth palladium phases RPd3 having the L12 structure using the technique of perturbed angular correlation of gamma rays (PAC). Measurements were made for pairs of samples having compositions of the Pd-poorer and Pd-rich boundaries of the RPd3 phase fields, typically 75 and 78 at.% Pd. Two signals were detected in most phases, corresponding to probe atoms on cubic R- and non-cubic Pd-Sublattices. Site preferences of parent In-probe atoms were characterized by site-fractions of probes on the R- and Pd-Sublattices. For all Pd-rich samples, probes exclusively occupied the R-Sublattice, consistent with a heuristic rule that solute atoms tend to occupy the Sublattice of an element in which there is a deficiency. For Pd-poorer alloys with R = Tb, Er, Yb, Lu, Y and Sc, probes exclusively occupied the Pd-Sublattice. For Pd-poorer alloys with R = Ce, Pr, Nd, Sm and Eu, probes occupied both Sublattices, with site fractions varying as a function of temperature. In contrast, probes only occupied the R-Sublattice in Pd-poorer LaPd3. Jump frequencies on the Pd-Sublattice of daughter Cd-probes were determined from nuclear relaxation caused by fluctuating electric field gradients. Activation enthalpies for diffusional jumps were determined from temperature dependences and found to increase linearly as the lattice parameter decreases along the series Pr, Nd, Eu and Sm. Jump frequencies are believed to have been even higher in CePd3 than in PrPd3, but were too low to be detectable in Tb, Er, Yb, Lu, Y and Sc palladides. A correlation between site preferences and jump frequencies is noted and discussed. This paper provides a complete account of measurements of jump frequencies of Cd-probe atoms and comparisons with similar measurements made on other series of L12 phases.
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nuclear quadrupole interactions of 111in cd solute atoms in a series of rare earth palladium alloys
Hyperfine Interactions, 2013Co-Authors: Qiaoming Wang, Gary S CollinsAbstract:Nuclear quadrupole interactions were measured at 111In/Cd probe atoms in rare-earth palladium phases RPd3 having the L12 structure using the technique of perturbed angular correlation of gamma rays (PAC). Measurements were made for pairs of samples having compositions of the Pd-poorer and Pd-rich boundaries of the RPd3 phase fields, typically 75 and 78 at.% Pd. Two signals were detected in most phases, corresponding to probe atoms on cubic R- and non-cubic Pd-Sublattices. Site preferences of parent In-probe atoms were characterized by site-fractions of probes on the R- and Pd-Sublattices. For all Pd-rich samples, probes exclusively occupied the R-Sublattice, consistent with a heuristic rule that solute atoms tend to occupy the Sublattice of an element in which there is a deficiency. For Pd-poorer alloys with R = Tb, Er, Yb, Lu, Y and Sc, probes exclusively occupied the Pd-Sublattice. For Pd-poorer alloys with R = Ce, Pr, Nd, Sm and Eu, probes occupied both Sublattices, with site fractions varying as a function of temperature. In contrast, probes only occupied the R-Sublattice in Pd-poorer LaPd3. Jump frequencies on the Pd-Sublattice of daughter Cd-probes were determined from nuclear relaxation caused by fluctuating electric field gradients. Activation enthalpies for diffusional jumps were determined from temperature dependences and found to increase linearly as the lattice parameter decreases along the series Pr, Nd, Eu and Sm. Jump frequencies are believed to have been even higher in CePd3 than in PrPd3, but were too low to be detectable in Tb, Er, Yb, Lu, Y and Sc palladides. A correlation between site preferences and jump frequencies is noted and discussed. This paper provides a complete account of measurements of jump frequencies of Cd-probe atoms and comparisons with similar measurements made on other series of L12 phases.
Ri Chen - One of the best experts on this subject based on the ideXlab platform.
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analysis on three Sublattice model of magnetic properties in rare earth iron garnets under high magnetic fields
Journal of Alloys and Compounds, 2012Co-Authors: Wei Wang, Ri ChenAbstract:Abstract In this paper, based on the molecular field theory, a new and improved three-Sublattice model on studying the magnetic properties of ferrimagnetic rare-earth iron garnet in high magnetic fields is introduced. Here, the effective exchange field is described as H i = λM = λχH e , where λ is the coefficient associated with the molecular field, χ is the effective magnetic susceptibility, and H e is external magnetic fields. As is known, the magnetic Sublattices in rare-earth iron garnets can be classified three kinds labeled as a , c and d , in our calculations, whose magnetizations are defined as M a , M c and M d , respectively. Then, using this model, the temperature and field dependences of the total magnetization in Dy 3 Fe 5 O 12 (DyIG) are discussed. Meanwhile, the magnetizations of the three kinds of magnetic Sublattices are analyzed. Furthermore, our theory suggests that the coefficients α i associated with λ and χ in DyIG show obvious anisotropic, temperature-dependence and field-dependence characteristics. And, the theoretical calculations exactly fit the experimental data.
Yuyang Pan - One of the best experts on this subject based on the ideXlab platform.
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formation of kagome white eye honeycomb hexagonal superlattice pattern in dielectric barrier discharge
Physical Review E, 2019Co-Authors: Lifang Dong, Binbin Liu, Yuyang PanAbstract:A kagome-white-eye-honeycomb hexagonal superlattice pattern is observed in dielectric barrier discharge and studied by two photomultipliers, an intensified charge-coupled device, and a spectrograph. It consists of four Sublattices, which are kagome structure, halos of white-eye hexagon, honeycomb frame, and central spots hexagon. As an unconventional symmetry Sublattice, the kagome structure results in amazing Sublattice discharge order. Based on the consideration that any discharge is related to all previous discharges, a mapping matrix which governs self-organization of the pattern is proposed. These results will promote the development of the pattern dynamics.
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spatio temporal dynamics of the white eye square superlattice pattern in dielectric barrier discharge
Journal of Physics D, 2016Co-Authors: Lingyan Wei, Lifang Dong, Jianyu Feng, Weibo Liu, Weili Fan, Yuyang PanAbstract:We report on the first investigation of the white-eye square superlattice pattern (WESSP) in a dielectric barrier discharge system. The evolution of patterns with increasing voltage is given. A phase diagram of WESSP as functions of gas pressure p and argon concentration is presented. The spatio-temporal dynamics of the WESSP is studied by using an intensified charge-coupled device camera and photomultipliers. Results show that the WESSP consists of four different transient Sublattices, whose discharge sequence is small spots—spots on the line—halos—central spots in each half voltage cycle. The discharge moment and position of each Sublattice are dependent upon the field of the wall charges produced by all Sublattices discharged previously.
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square grid superlattice pattern in dielectric barrier discharge system
Journal of the Physical Society of Japan, 2015Co-Authors: Yenan Gao, Lifang Dong, Xinpu Zhang, Yuyang PanAbstract:We report on the observation of the square grid superlattice pattern in dielectric barrier discharge system. Instantaneous images taken by an intensified charge-coupled device show that the pattern is an interleaving of four transient Sublattices including three square Sublattices and a cross-shaped halo Sublattice. Comparing the single-frame instantaneous image with the 30-cycles integration image, it is found that the cross-shaped halo Sublattice consists of several sporadic filaments. They discharge at different positions of the discharge-area in successive half-cycles of the applied voltage, which would have little influence on the following discharges. The calculation further verifies the significant influence of the wall charges which are accumulated in the first discharge on the following discharges during each half voltage-cycle.
J Barnas - One of the best experts on this subject based on the ideXlab platform.
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exchange interaction of magnetic impurities in graphene
Physical Review B, 2006Co-Authors: V K Dugaev, V I Litvinov, J BarnasAbstract:The indirect exchange interaction between magnetic impurities localized in a graphene plane is considered theoretically, with the influence of intrinsic spin-orbit interaction taken into account. Such an interaction gives rise to an energy gap at the Fermi level, which makes the usual RKKY model not applicable. The results show that the effective indirect exchange interaction is described by a range function which decays exponentially with the distance between magnetic moments. The interaction is also shown to depend on whether the two localized moments belong to the same Sublattice or are located in two different Sublattices.
