Effects of Strong Magnetic Fluctuations on the Transport Behavior of Pyrochlore Ruthenates near the Metal-Insulator Phase Boundary.
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- Yoshii Shunsuke
- CREST, Japan Science and Technology Corporation (JST)
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- Murata Kazuhiro
- Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602
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- Sato Masatoshi
- Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)
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Abstract
Transport and magnetic properties of pyrochlore ruthenates R2-xBixRu2O7 (R=Sm and Eu), which exhibit the Mott insulator to metal transition with increasing x, have been studied. The electrical resistivity ρ and the Hall coefficient RH are found to strongly couple to the change of the magnetic state, or the transition to the spin-glass state which takes place at temperature T=TG. Near the metal-insulator phase boundary, RH above TG increases rather rapidly with decreasing T even in the metallic phase, and the Hall angle θH follows a simple relation, cot θH ∝ a+bT2, over the wide T-range. At T=TG, RH has a peak and it decreases with decreasing T. These results indicate that strong spin fluctuations above TG induce the anomalous T-dependence of RH in the present magnetically frustrated three-dimensional system and RH decreases as the spin freezing proceeds.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 69 (1), 17-20, 2000
THE PHYSICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282679156638208
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- NII Article ID
- 210000102292
- 110001970974
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- NII Book ID
- AA00704814
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- BIBCODE
- 2000JPSJ...69...17Y
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 4970373
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed