PSEUDO-1D MAGNETIC ORDER AND FLUCTUATION BEHAVIOR OF 3D-DOPANTS IN SUPERCONDUCTING YBA2CU3-XFEXO7+DELTA

被引：31

作者：

PENG, W ^{[1
]}

KIMBALL, CW ^{[1
]}

DUNLAP, BD ^{[1
]}

机构：

[1] ARGONNE NATL LAB,ARGONNE,IL 60439

来源：

PHYSICA C | 1990年 / 169卷 / 1-2期

关键词：

Ceramic Materials - Iron and Alloys - Yttrium Compounds - Order-Disorder;

D O I：

10.1016/0921-4534(90)90284-L

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

It is shown that Fe substituents in the Cu(1) site of YBa2Cu3-xFexO7 (x=0.15, 0.30) magnetically order into quasi-1D chains with strong intrachain but weak interchain coupling. The strong fluctuation behavior expected in low-dimensional systems above and below TN is observed via characteristics relaxation in the Mössbauer line width near TN. The temperature dependence of the magnetic subspectra representing Fe ions with various local oxygen environments fit to a 2D-Ising model with a ratio of the anisotropic exchange between the two directions of the order of (0.5-1.0)×10-3. The concentration dependence of the relative occurrence of various magnitudes of the local dopant magnetization is related to a short-range chemical order which determines the magnetic chain size and defines the correlation lengths. Evidence is given that the presence of rare earth magnetic moments in the Y-site affects the character of the magnetic interaction in the Cu(1)-site. © 1990.

引用

页码：23 / 34

页数：12

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