2-D AND 3-D MAGNETIC-ORDERING OF ER IN ERBA2CU3OX(6 LESS-THAN-OR-EQUAL TO 7)

被引：34
|
作者：
MALETTA, H [1 ]
PORSCHKE, E [1 ]
CHATTOPADHYAY, T [1 ]
BROWN, PJ [1 ]
机构：
[1] INST MAX VON LAUE PAUL LANGEVIN, F-38042 GRENOBLE, FRANCE
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1990年 / 166卷 / 1-2期
关键词：
D O I：
10.1016/0921-4534(90)90544-O
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Results of neutron-diffraction experiments on powder samples of ErBa2Cu3Ox with oxygen content x = 6.87, 6.64, 6.53, 6.40, 6.20 and 6.11 are presented. The superconducting compounds with x = 6.87, 6.64 and 6.53 exhibit three-dimensional (3-D) antiferromagnetic ordering of the Er moments with wave vector km = ( 1 2, 0, 1 2) and μ{norm of matrix}b below the Néel temperatures TN = 585(5), 530(5) and 460(5) mK, respectively. Their critical behavior near TN is 2-D in character, and short-range magnetic correlations can be measured up to about 1 K. In contrast, in the oxygen-deficient compounds with x = 6.40, 6.20 and 6.11 only 2-D antiferromagnetic correlations with ( 1 2, 0) grow at low T which saturate below about 200 mK. The suppression of 3-D antiferromagnetic order of Er upon oxygen removal coincides with the suppression of superconductivity, indicating the strong depression of the coupling between adjacent Cu(2)-O planes via Cu(1)-O "chains" near x = 6.45. © 1990.
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页码：9 / 14
页数：6
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