Mossbauer study of electric field gradient in Bi-system high-Tc superconductor

Li Yang Cao Guohui Ma Ruzhang

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Mossbauer study of electric field gradient in Bi-system high-Tc superconductor

更新时间：2021-04-09

- Mossbauer study of electric field gradient in Bi-system high-Tc superconductor
- NUCLEAR TECHNIQUES Issue 7, (1992)
- 作者机构：
  
  1. 北京科技大学
  2. 北京科技大学,北京,100083
- 作者简介：
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- DOI：
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- Published：01 July 1992
- 稿件说明：
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[1]李阳,曹国辉,马如璋.铋系高Tc超导体电场梯度的穆斯堡尔研究[J].核技术,1992(07):408-412.

Li Yang Cao Guohui Ma Ruzhang. Mossbauer study of electric field gradient in Bi-system high-Tc superconductor[J]. Nuclear techniques, 1992, (7): 408-412.
[1]李阳,曹国辉,马如璋.铋系高Tc超导体电场梯度的穆斯堡尔研究[J].核技术,1992(07):408-412. DOI：

Li Yang Cao Guohui Ma Ruzhang. Mossbauer study of electric field gradient in Bi-system high-Tc superconductor[J]. Nuclear techniques, 1992, (7): 408-412. DOI：

摘要

我们对掺有

Fe微量元素的铋系高Tc超导相进行了穆斯堡尔谱研究

同质异能移位表明分别占据平面和金字塔晶位的铁离子为+3价态

在铋系超导体为离子晶体的前提下

我们利用点电荷模型和有效离子键价模型

在以Cu（1）和Cu（2）晶位为中心分别包含845和884个原子的cluster中计算了铋系高温相中铁原子所占据的铜晶位的电场梯度

其结果与穆斯堡尔谱实验结果符合较好。

Abstract

The 57Fe Mossbauer study on high-Tc superconducting phase of Fe-doped Bi-system is performed. The isomer shifts indicate that Fe ions occupying Cu square and pyramidal lattice sites are in the high-spin 3+ state. Considering the Bi-based high-Tc superconductor is an ionic crystal and using effective valence and point charge model

we calculate the electric field gradient on different Cu lattice sites occupied by Fe ions within a cluster containing 845 and 884 ions respectively. The calculated result is in agreement with that of the Mossbauer experiment.

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