On the Magnetic Ground State of La0.85Sr0.15CoO3 Single Crystals

被引：18

作者：

Manna, Kaustuv ^{[1
]}

Samal, Debakanta ^{[1
]}

Elizabeth, Suja ^{[1
]}

Bhat, H. L. ^{[1
,2
]}

Kumar, P. S. Anil ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

[2] Ctr Soft Matter Res, Bangalore 560013, Karnataka, India

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 29期

关键词：

SPIN-GLASS BEHAVIOR; NEUTRON-DIFFRACTION; LA1-XSRXCOO3; TRANSITION; ANOMALIES; ORIGIN; SYSTEM; ORDER;

D O I：

10.1021/jp201206a

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 present an extensive study on magnetic and transport properties of La0.85Sr0.15CoO3 single crystals grown by a float zone method to address the issue of phase separation versus spin-glass (SG) behavior. The dc magnetization study reveals a kink in field-cooled magnetization, and the peak in the zero-field-cooling curve shifts to lower temperature at modest dc fields, indicating the SG magnetic phase. The ac susceptibility study exhibits a considerable frequency-dependent peak shift (similar to 4 K) and a time-dependent memory effect below the freezing temperature. In addition, the characteristic time scale tau(0) estimated from the frequency-dependent ac susceptibility measurement is found to be similar to 10(-13) s, which matches well with typical values observed in canonical SG systems. The transport relaxation study evidently demonstrates the time-dependent glassy phenomena. In essence, all our experimental results corroborate the existence of SG behavior in La0.85Sr0.15CoO3 single crystals.

引用

页码：13985 / 13990

页数：6

共 39 条

[1] Magnetic and electronic properties of La1-xSrxCoO3 single crystals across the percolation metal-insulator transition [J].