Pressure-induced Fermi-surface reconstruction in the iron-arsenide superconductor Ba1-xKxFe2As2: Evidence of a phase transition inside the antiferromagnetic phase

被引：55

作者：

Hassinger, E. ^{[1
,2
]}

Gredat, G. ^{[1
,2
]}

Valade, F. ^{[1
,2
]}

de Cotret, S. Rene ^{[1
,2
]}

Juneau-Fecteau, A. ^{[1
,2
]}

Reid, J. -Ph. ^{[1
,2
]}

Kim, H. ^{[3
]}

Tanatar, M. A. ^{[3
]}

Prozorov, R. ^{[3
,4
]}

Shen, B. ^{[5
,6
]}

Wen, H. -H. ^{[5
,6
,7
]}

Doiron-Leyraud, N. ^{[1
,2
]}

Taillefer, Louis ^{[1
,2
,7
]}

机构：

[1] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

[2] Univ Sherbrooke, RQMP, Sherbrooke, PQ J1K 2R1, Canada

[3] Ames Lab, Ames, IA 50011 USA

[4] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[5] Nanjing Univ, Ctr Superconducting Phys & Mat, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[6] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China

[7] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 14期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevB.86.140502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electrical resistivity. of the iron-arsenide superconductor Ba1-xKxFe2As2 was measured in applied pressures up to 2.6 GPa for four underdoped samples, with x similar or equal to 0.16, 0.18, 0.19, and 0.21. The antiferromagnetic ordering temperature T-N, detected as a sharp anomaly in rho(T), decreases linearly with pressure. At pressures above P similar or equal to 1.0 GPa, a second sharp anomaly is detected at a lower temperature T-0, which rises with pressure. We attribute this second anomaly to the onset of a phase that causes a reconstruction of the Fermi surface. The new phase expands with increasing x and it competes with superconductivity. We discuss the possibility that a second spin-density wave orders at T-0, with a Q vector distinct from that of the spin-density wave that sets in at T-N.

引用

页数：5

共 17 条

[1] Phase diagram of Ba1-xKxFe2As2 [J].