Nature of the transition between a ferromagnetic metal and a spin-glass insulator in pyrochlore molybdates

N. Hanasaki, K. Watanabe, T. Ohtsuka, I. Kézsmárki, S. Iguchi, S. Miyasaka, Y. Tokura

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

The metal-insulator transition has been investigated for pyrochlore molybdates R2Mo2O7 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.

Original languageEnglish
Article number086401
JournalPhysical Review Letters
Volume99
Issue number8
DOIs
Publication statusPublished - 2007 Aug 21
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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