The metal-insulator transition has been investigated for pyrochlore molybdates R(2)Mo(2)O(7) with nonmagnetic rare-earth ions R. The dynamical scaling analysis of ac susceptibility reveals that the geometrical frustration causes the atomic spin-glass state. The reentrant spin-glass phase exists below the ferromagnetic transition. The electronic specific heat is enhanced as compared to the band calculation result, perhaps due to the orbital fluctuation in the half-metallic ferromagnetic state. The large specific heat is rather reduced upon the transition, likely because the short-range antiferromagnetic fluctuation shrinks the Fermi surface.
Nature of the transition between a ferromagnetic metal and a spin-glass insulator in pyrochlore molybdates. Publishing Authors By Initials
Nature of the transition between a ferromagnetic metal and a spin-glass insulator in pyrochlore molybdates. Journal Published:
PUBLICATION TYPE: Research Support, Non-U.S. Gov
Journal: Physical review letters
VOLUME: 99
Page Numbers: 086401
Journal Abbreviation: Phys. Rev. Lett.
ISSN: 0031-9007
DAY: 21
MONTH: 08
YEAR: 2007
Nature of the transition between a ferromagnetic metal and a spin-glass insulator in pyrochlore molybdates. Information
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LANGUAGE: eng
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AFFILIATION: Department of Applied Physics, University of Tokyo, Tokyo, Japan.
Country: United States
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MEDLINETA: Phys Rev Lett
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