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 language | English |
---|---|
Pages (from-to) | 17-20 |
Number of pages | 4 |
Journal | journal of the physical society of japan |
Volume | 69 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2000 Jan |
Keywords
- Anomalous transport properties
- Hall angle
- Metal-insulator transition
- SmBiRuO
- Spin fluctuation
- Spin-glass
ASJC Scopus subject areas
- Physics and Astronomy(all)