Effect of fluorination on the structure and superconducting properties of the Hg-1201 phase

被引：38

作者：

Abakumov, AM ^{[1
]}

Aksenov, VL

Alyoshin, VA

Antipov, EV

Balagurov, AM

Mikhailova, DA

Putilin, SN

Rozova, MG

机构：

[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia

[2] Joint Inst Nucl Res, Frank Lab Neutron Phys, Dubna 141980, Russia

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.80.385

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A fluorination of the reduced HgBa2CuO4+delta (Hg-1201) with T-c = 61 K resulted first in an increase in T-c upto 97 K and then in a decrease and even a suppression of superconductivity due to overdoping. Neutron powder refinements performed on fluorinated HgBa2CuO4Fdelta showed twice the amount of extra fluorine in comparison with those for the oxygenated Hg-1201 phases with close T-c. This supports the ionic model of doping in Hg-1201: two holes per oxygen and one hole per fluorine. The apical distances in Hg-1201 depend on the number of dopant atoms rather than on their charge. The exchange of extra oxygen for a double amount of fluorine shortens the apical Cu-O distances, while the in-plane distances and T-c do not vary.

引用

页码：385 / 388

页数：4

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