Spin-glass behavior in Pr0.7Ca0.3CoO3 and Nd0.7Ca0.3CoO3

被引：25
作者：
Kundu, AK
Nordblad, P
Rao, CNR
机构：
[1] Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India
[2] Univ Uppsala, Dept Engn Sci, S-75121 Uppsala, Sweden
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2006年 / 179卷 / 03期
关键词：
rare earth cobaltates; magnetic properties; spin-glasses;
D O I：
10.1016/j.jssc.2005.12.014
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
With a view to investigate the effect of small size of A-site cations on the magnetic properties of the rare earth cobaltates, Ln(1-x)A(x)CoO(3) (Ln = rare earth, A = alkaline earth), we have investigated Pr0.7Ca0.3CoO3 and Nd0.7Ca0.3CoO3 in detail. For this purpose, we have carried out low-field DC magnetization and ac susceptibility measurements including a study of magnetic relaxation and memory effects. Both Pr0.7Ca0.3CoO3 and Nd0.7Ca0.3CoO3 show frequency-dependent transitions at 70 and 55 K respectively in the ac susceptibility data, due to the onset of spin-glass like behavior. Their relaxation behavior exhibits aging effects. In addition, memory effects are found in the magnetization behavior. These characteristics establish spin-glass behavior in both these cobaltates, a behavior that is distinctly different from that of La0.7Ca0.3CoO3 and La0.5Sr0.5CoO3 which show well-defined ferromagnetic transitions, albeit without long-range ordering. (C) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码：923 / 927
页数：5
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