Momentum-resolved superconducting gap in the bulk of Ba1-xKxFe2As2 from combined ARPES and μSR measurements

被引：121

作者：

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

Inosov, D. S. ^{[1
,2
]}

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

Viazovska, M. S. ^{[3
]}

Khasanov, R. ^{[4
]}

Amato, A. ^{[4
]}

Klauss, H-H ^{[5
]}

Luetkens, H. ^{[4
]}

Niedermayer, Ch ^{[6
,7
]}

Sun, G. L. ^{[2
]}

Hinkov, V. ^{[2
]}

Lin, C. T. ^{[2
]}

Varykhalov, A. ^{[8
]}

Koitzsch, A. ^{[1
]}

Knupfer, M. ^{[1
]}

Buechner, B. ^{[1
]}

Kordyuk, A. A. ^{[1
,9
]}

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

机构：

[1] IFW Dresden, Inst Solid State Res, D-01171 Dresden, Germany

[2] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[3] Max Planck Inst Math, D-53111 Bonn, Germany

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

[5] Tech Univ Dresden, IFP, D-01069 Dresden, Germany

[6] Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[7] ETH, CH-5232 Villigen, Switzerland

[8] BESSY, D-12489 Berlin, Germany

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

来源：

NEW JOURNAL OF PHYSICS | 2009年 / 11卷

关键词：

PENETRATION DEPTH; PHOTOEMISSION;

D O I：

10.1088/1367-2630/11/5/055069

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Here we present a calculation of the temperature-dependent London penetration depth, lambda(T), in Ba1-xKxFe2As2 (BKFA) on the basis of the electronic band structure (Zabolotnyy et al 2009 Nature 457 569, Zabolotnyy et al 2009 Physica C 469 448) and momentum-dependent superconducting gap (Evtushinsky et al 2009 Phys. Rev. B 79 054517) extracted from angle-resolved photoemission spectroscopy (ARPES) data. The results are compared to the direct measurements of lambda(T) by muon spin rotation (mu SR) (Khasanov et al 2009 Phys. Rev. Lett. 102 187005). The value of lambda(T = 0), calculated with no adjustable parameters, equals 270 nm, while the directly measured one is 320 nm; the temperature dependence lambda(T) is also easily reproduced. Such agreement between the two completely different approaches allows us to conclude that ARPES studies of BKFA are bulk-representative. Our review of the available experimental studies of the superconducting gap in the new iron-based superconductors in general allows us to state that most of them bear two nearly isotropic gaps with coupling constants 2 Delta/k(B)T(c) = 2.5 +/- 1.5 and 7 +/- 2.

引用

页数：13

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