31P NMR of trimer cluster compound Sr3CU3(PO4)4

被引：4
|
作者：
Ghosh, M. [1 ]
Ghoshray, K. [1 ]
Pahari, B. [1 ]
Sarkar, R. [1 ]
Ghoshray, A. [1 ]
机构：
[1] Saha Inst Nucl Phys, ECMP Div, Kolkata 700064, W Bengal, India
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2007年 / 68卷 / 11期
关键词：
A. magnetic materials (oxides); D. magnetic properties (NMR);
D O I：
10.1016/j.jpcs.2007.08.061
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
P-31 NMR in S = 1/2 cluster compound Sr3CU3(PO4)(4) was investigated. At any temperature, the spectrum corresponds to a typical 2 overlap of two powder patterns, consistent with two inequivalent phosporous sites, having different components of the shift parameters. Intra-trimer exchange (J(1) = 110 +/- 15 K) and hyperfine field (H-hf) were directly obtained from temperature dependence of K-iso, considering S = 1/2, Heisenberg linear trimer. The behavior of the H-hf for the two sites are quite different and reflects the formation of 2 trimers below 100 K. The relaxation rate, 1/T-1 in the range 100-210 K, shows an activation (Delta/k(B) = 43 K) dependence of the spin excitation. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2183 / 2186
页数：4
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