Chemical pressure control of exchange interaction in Mo pyrochlore

被引：62

作者：

Moritomo, Y ^{[1
]}

Xu, S

Machida, A

Katsufuji, T

Nishibori, E

Takata, M

Sakata, M

Cheong, SW

机构：

[1] Nagoya Univ, CIRSE, Nagoya, Aichi 4648601, Japan

[2] Nagoya Univ, Dept Crystalline Mat Sci, Nagoya, Aichi 4648603, Japan

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

[4] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.63.144425

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Structural parameters are systematically investigated for Mo pyrochlore R2Mo2O7 (R = Dy, Gd, Sm, and Nd) by means of synchrotron radiation x-ray powder diffraction. This system shows a crossover from the spin-glass (SG) state to the ferromagnetic metallic (FM) state as the averaged ionic radius r(R) of the rare-earth ion increases. We have found the Mo-O-Mo bond angle increases with r(R) from 129.7 degrees for Dy2Mo2O7 (SG) to 131.5 degrees for Nd2Mo2O7 (FM). This behavior is opposite to the so-called Kanamori-Goodenough rule.

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页数：5

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