Anomalous ferromagnetic behavior and large magnetoresistance induced by orbital fluctuation in heavily doped Nd1-xSrxMnO3 (0.57 ≤ x ≤ 0.75)

被引：20

作者：

Akahoshi, D. ^{[1
]}

Hatakeyama, R. ^{[1
]}

Nagao, M. ^{[2
]}

Asaka, T. ^{[2
]}

Matsui, Y. ^{[2
]}

Kuwahara, H. ^{[1
]}

机构：

[1] Sophia Univ, Dept Phys, Tokyo 1028554, Japan

[2] Natl Inst Mat Sci, Adv Nano Characterizat Ctr, Tsukuba, Ibaraki 3050044, Japan

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.77.054404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have elaborately investigated heavily doped Nd1-xSrxMnO3 with x = 0.57-0.75. 3z(2) - r(2) and x(2) - y(2) orbital orders strongly compete with each other at x = 0.625. The competition causes spatial orbital fluctuation on nanometer scale below the orbital ordering temperature (T-OO similar to 500 K), which is evidenced by the observation of tweed structure using transmission electron microscopy. The orbital fluctuation, which persists down to lowest temperatures, gives rise to anomalous ferromagnetic behavior and concomitant large magnetoresistance well below the Neel temperature (T-N = 220 K).

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页数：5

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