Evidence of nodal gap structure in the basal plane of the FeSe superconductor

被引：20

作者：

Biswas, Pabitra K. ^{[1
]}

Kreisel, Andreas ^{[2
]}

Wang, Qisi ^{[3
,4
]}

Adroja, Devashibhai T. ^{[1
,5
]}

Hillier, Adrian D. ^{[1
]}

Zhao, Jun ^{[3
,4
]}

Khasanov, Rustem ^{[6
]}

Orain, Jean-Christophe ^{[6
]}

Amato, Alex ^{[6
]}

Morenzoni, Elvezio ^{[6
]}

机构：

[1] STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Harwell Campus, Didcot OX11 0QX, Oxon, England

[2] Univ Leipzig, Inst Theoret Phys, D-04103 Leipzig, Germany

[3] Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[4] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

[5] Univ Johannesburg, Phys Dept, Highly Correlated Matter Res Grp, POB 524, ZA-2006 Auckland Pk, South Africa

[6] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW B | 2018年 / 98卷 / 18期

基金：

中国国家自然科学基金;

关键词：

MAGNETIC PENETRATION DEPTH; MU-SR; IRON; STATE;

D O I：

10.1103/PhysRevB.98.180501

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Identifying the symmetry of the wave function describing the Cooper pairs is pivotal in understanding the origin of high-temperature superconductivity in iron-based superconductors. Despite nearly a decade of intense investigation, the answer to this question remains elusive. Here, we use the muon spin rotation/relaxation (mu SR) technique to investigate the underlying symmetry of the pairing state of the FeSe superconductor, the basic building block of all iron-chalcogenide superconductors. Contrary to earlier mu SR studies on powders and crystals, we show that while the superconducting gap is most probably anisotropic but nodeless along the crystallographic c axis, it is nodal in the ab plane, as indicated by the linear increase of the superfluid density at low temperature. We further show that the superconducting properties of FeSe display a less pronounced anisotropy than expected.

引用

页数：6

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