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Magnetic Behavior of Oxides and Nanophase Materials Certain manganese oxides, when doped, exhibit remarkable changes in electrical resistance at the ferromagnetic transition temperature. These changes are sensitive to magnetic fields, causing colossal magnetoresistance. Recent work focuses on the ferromagnetic state and the nature of the transition to it. We have found that the resistivity of single-crystal samples is independent of temperature at the lowest temperatures, followed by the sudden onset of temperature dependence arising from electron-spin wave scattering processes above 20 K. The conductivity, thermoelectric power, and possibly the Hall coefficient can be treated in the regime near Tc in terms of two-phase behavior involving polarons and band electrons. A new mechanism for the Hall effect, arising from quantum phases in a partially disordered magnet, has been demonstrated.
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论文共 32 篇作者统计合作学者相似作者
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Proceedings of the National Academy of Sciencesno. 51 (2021)
Physical Review Bno. 23 (2019)
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#Papers: 32
#Citation: 3603
H-Index: 14
G-Index: 14
Sociability: 5
Diversity: 3
Activity: 6
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