Weak-coupling superconductivity in electron-doped NaFe0.95Co0.05As revealed by ARPES

被引：21

作者：

Thirupathaiah, S. ^{[1
]}

Evtushinsky, D. V. ^{[1
]}

Maletz, J. ^{[1
]}

Zabolotnyy, V. B. ^{[1
]}

Kordyuk, A. A. ^{[1
,3
]}

Kim, T. K. ^{[2
]}

Wurmehl, S. ^{[1
,5
]}

Roslova, M. ^{[1
,4
]}

Morozov, I. ^{[1
,4
]}

Buechner, B. ^{[1
,5
]}

Borisenko, S. V. ^{[1
]}

机构：

[1] Leibniz Inst Solid State & Mat Res Dresden, D-01171 Dresden, Germany

[2] Diamond Light Source Ltd, Didcot OX11 0DE, Oxon, England

[3] Natl Acad Sci Ukraine, Inst Met Phys, UA-03142 Kiev, Ukraine

[4] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119991, Russia

[5] Tech Univ Dresden, Inst Festkorperphys, D-01171 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 21期

关键词：

LIFEAS;

D O I：

10.1103/PhysRevB.86.214508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report a systematic study on the electronic structure and superconducting (SC) gaps in electron-doped NaFe0.95Co0.05As superconductor using angle-resolved photoemission spectroscopy. Holelike Fermi sheets are at the zone center and electronlike Fermi sheets are at the zone corner, and are mainly contributed by xz and yz orbital characters. Our results reveal a Delta/KBTc in the range of 1.8-2.1, suggesting a weak-coupling superconductivity in these compounds. Gap closing above the transition temperature (T-c) shows the absence of pseudogaps. Gap evolution with temperature follows the BCS gap equation near the Gamma, Z, and M high symmetry points. Furthermore, an almost isotropic superconductivity along the k(z) direction in the momentum space is observed by varying the excitation energies.

引用

页数：5