Emergence of a Diffusive Metal State with No Magnetic Order near the Mott Transition in Frustrated Pyrochlore-Type Molybdates

被引：33

作者：

Iguchi, S. ^{[1
]}

Hanasaki, N. ^{[1
]}

Kinuhara, M. ^{[1
]}

Takeshita, N. ^{[2
]}

Terakura, C. ^{[3
]}

Taguchi, Y. ^{[3
]}

Takagi, H. ^{[2
,4
]}

Tokura, Y. ^{[1
,2
,3
,5
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[2] Natl Inst Adv Ind Sci & Technol, Correlated Electron Res Ctr CERC, Tsukuba, Ibaraki 3058562, Japan

[3] RIKEN, ASI, CMRG, Wako, Saitama 3510198, Japan

[4] Univ Tokyo, Dept Adv Mat Sci, Tokyo 1138656, Japan

[5] Japan Sci & Technol Agcy, ERATO, Multiferro Project, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 13期

关键词：

R2MO2O7; PHASE;

D O I：

10.1103/PhysRevLett.102.136407

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electron-correlation driven metal-insulator (Mott) transition in pyrocholore-type R(2)Mo(2)O(7)(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.

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页数：4

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