Emergence of a diffusive metal state with no magnetic order near the mott transition in frustrated pyrochlore-type molybdates

S. Iguchi, N. Hanasaki, M. Kinuhara, N. Takeshita, C. Terakura, Y. Taguchi, H. Takagi, Y. Tokura

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The electron-correlation driven metal-insulator (Mott) transition in pyrocholore-type R2Mo2O7(R being rare-earth-metal ions) is accompanied by the change of the magnetic state from ferromagnetic to spin glass due to the competing double-exchange and superexchange interactions on the frustrated lattice. By application of high pressures on the compounds with Mott criticality, however, a new unique paramagnetic metal phase is observed to show up with nearly temperature-independent high resistivity close to the Ioffe-Regel limit. A possible non-Fermi-liquid character of this anomalously diffuse metallic state is argued in terms of the extended double-exchange model with the magnetically frustrated local S=12 spins.

Original languageEnglish
Article number136407
JournalPhysical Review Letters
Volume102
Issue number13
DOIs
Publication statusPublished - 2009 Mar 30
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Emergence of a diffusive metal state with no magnetic order near the mott transition in frustrated pyrochlore-type molybdates'. Together they form a unique fingerprint.

Cite this