Superconducting and normal phases of FeSe single crystals at high pressure

被引：107

作者：

Braithwaite, D. ^{[1
]}

Salce, B. ^{[1
]}

Lapertot, G. ^{[1
]}

Bourdarot, F. ^{[1
]}

Marin, C. ^{[1
]}

Aoki, D. ^{[1
]}

Hanfland, M. ^{[2
]}

机构：

[1] CEA, INAC SPSMS, F-38054 Grenoble, France

[2] ESRF, F-38043 Grenoble, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2009年 / 21卷 / 23期

关键词：

Magnetic susceptibility - X ray diffraction - Lead oxide - Selenium compounds - Iron-based Superconductors - Liquefied gases - Lithium compounds - Iron compounds - Potassium compounds;

D O I：

10.1088/0953-8984/21/23/232202

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report on the synthesis of superconducting single crystals of FeSe and their characterization by x-ray diffraction, magnetization and resistivity. We have performed ac susceptibility measurements under high pressure in a hydrostatic liquid argon medium up to 14 GPa and we find that T-C increases up to 33-36 K in all samples, but with slightly different pressure dependences on different samples. Above 12 GPa no traces of superconductivity are found in any sample. We have also performed a room temperature high pressure x-ray diffraction study up to 12 GPa on a powder sample, and we find that, between 8.5 and 12 GPa, the tetragonal PbO structure undergoes a structural transition to a hexagonal structure. This transition results in a volume decrease of about 16% and is accompanied by the appearance of an intermediate, probably orthorhombic, phase.

引用

页数：5

共 20 条

[1] Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures [J].