Transition from itinerant to polaronic conduction in La1-xSrxCoO3 perovskites

被引：40

作者：

Caciuffo, R

Mira, J

Rivas, J

Señarís-Rodríguez, MA

Radaelli, PG

Carsughi, F

Fiorani, D

Goodenough, JB

机构：

[1] Univ Ancona, Ist Nazl Fis Mat, I-60131 Ancona, Italy

[2] Univ Santiago Compostela, Dept Fis Aplicada, E-15706 Santiago, Spain

[3] Univ A Coruna, Dept Quim Fundamental & Ind, La Coruna 15071, Spain

来源：

EUROPHYSICS LETTERS | 1999年 / 45卷 / 03期

关键词：

D O I：

10.1209/epl/i1999-00178-y

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutron diffraction and small-angle scattering on La1-xSrxCoO3 (0 < x less than or equal to 0.30) show that for x = 0.3 the system is near a two-phase percolation threshold and undergoes a transition from itinerant to polaronic conduction at the Curie temperature T-C. The stabilization of superparamagnetic clusters on warming through T-C is revealed by an anomalous thermal expansion of the volume and a deviation of the paramagnetic susceptibility from the Curie-Weiss law. The development of a temperature-dependent small-angle-scattering signal confirms that regions of short-range ferromagnetic order are present above T-C.

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收藏

页码：399 / 405

页数：7

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