Effects of strong magnetic fluctuations on the transport behavior of pyrochlore ruthenates near the metal-insulator phase boundary

Shunsuke Yoshii, Kazuhiro Murata, Masatoshi Sato

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 p 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.

Original languageEnglish
Pages (from-to)17-20
Number of pages4
Journaljournal of the physical society of japan
Volume69
Issue number1
DOIs
Publication statusPublished - 2000 Jan

Keywords

  • Anomalous transport properties
  • Hall angle
  • Metal-insulator transition
  • SmBiRuO
  • Spin fluctuation
  • Spin-glass

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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