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
收藏
页码：73 / 77
页数：5
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