Exploration of magnetic order in Pr0.5Ca0.5CoO3-δ (δ=0) below the metal-insulator transition

被引：4

作者：

Baron-Gonzalez, A. J. ^{[1
]}

Frontera, C. ^{[1
]}

Garcia-Munoz, J. L. ^{[1
]}

Blasco, J. ^{[2
]}

Ritter, C. ^{[3
]}

Valencia, S. ^{[4
]}

Feyerherm, R. ^{[4
]}

Dudzik, E. ^{[4
]}

机构：

[1] CSIC, Inst Ciencia Mat Barcelona, Bellaterra 08193, Spain

[2] Univ Zaragoza, CSIC, Inst Ciencias Mat Aragon, Dept Fis Mat Condensada, Zaragoza 50009, Spain

[3] Inst Laue Langevin, F-38100 Grenoble, France

[4] Berlin Electron Storage Ring Soc Synchrotron Radia, Berlin, Germany

来源：

VI ENCUENTRO FRANCO-ESPANOL DE QUIMICA Y FISICA DEL ESTADO SOLIDO - VI RENCONTRE FRANCO-ESPAGNOLE SUR LA CHIMIE ET LA PHYSIQUE DE L ETAT SOLIDE | 2010年 / 8卷

关键词：

magnetic order; metal- insulator transition; cobaltites; perovskites; PEROVSKITE;

D O I：

10.1016/j.phpro.2010.10.014

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have investigated the low temperature magnetic state of Pr0.5Ca0.5CoO3-delta with (delta=0) by means of resistivity, dc magnetization, susceptibility, magnetotransport and neutron diffraction. We find that below the metal-insulator transition (MIT) this system can be described as a paramagnetic insulator with dominant ferromagnetic interactions between Co atoms. In this regime, it presents a considerable negative magnetoresistance (20%-40%), while above MIT the magnetoresistance is negligible or even slightly positive. Neutron diffraction measurements reveal that there is no long-range ferromagnetic (FM) or antiferromagnetic (AFM) order. These results are in contradiction with the spin state picture previously drawn for this system. (C) 2010 Published by Elsevier Ltd.

引用

页码：73 / 77

页数：5

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