Direct observation of the superconducting energy gap in the optical conductivity of the iron pnictide superconductor Ba(Fe0.9Co0.1)2As2

被引：54

作者：

Gorshunov, B. ^{[1
,2
]}

Wu, D. ^{[1
]}

Voronkov, A. A. ^{[2
]}

Kallina, P. ^{[1
]}

Iida, K. ^{[3
]}

Haindl, S. ^{[3
]}

Kurth, F. ^{[3
]}

Schultz, L. ^{[3
]}

Holzapfel, B. ^{[3
]}

Dressel, M. ^{[1
]}

机构：

[1] Univ Stuttgart, Inst Phys 1, D-70550 Stuttgart, Germany

[2] Russian Acad Sci, Prokhorov Inst Gen Phys, Moscow 119991, Russia

[3] IFW Dresden, Inst Metall Mat, D-01171 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 06期

关键词：

SPECTROSCOPY; PARAMETERS; FILMS;

D O I：

10.1103/PhysRevB.81.060509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The temperature-dependent optical reflectivity and complex transmissivity of an epitaxially grown Ba(Fe0.9Co0.1)(2)As-2 thin film were measured over a wide frequency range (4-35 000 cm(-1)). The opening of the superconducting gap 2 Delta(0) = (3.7 +/- 0.3) meV is directly observed by vanishing optical conductivity at 30 cm(-1) for T < T-c = 20 K. While in this range the measured temperature- and frequency-dependent electrodynamic properties agree well with the BCS predictions of a nodeless order parameter, unexpectedly a strong quasiparticle absorption shows up below 1.5 meV. The spectral weight of the condensate 1.94 x 10(7) cm(-2) corresponds to a penetration depth lambda = 3600 angstrom.

引用

页数：4

共 31 条

[1] Growth and anisotropy of La(O, F)FeAs thin films deposited by pulsed laser deposition [J].

Backen, E. ;

Haindl, S. ;

Niemeier, T. ;

Huehne, R. ;

Freudenberg, T. ;

Werner, J. ;

Behr, G. ;

Schultz, L. ;

Holzapfel, B. .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2008, 21 (12)

[2]

BARISIC N, UNPUB

[3]

Dressel M., 2002, Electrodynamics of solids: optical properties of electrons in matter

[4] THz spectroscopy of superconductors [J].

Dressel, Martin ;

Drichko, Natalia ;

Gorshunov, Boris ;

Pimenov, Andrei .

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, 2008, 14 (02) :399-406

[5] Terahertz BWO-spectrosopy [J].

Gorshunov, B ;

Volkov, A ;

Spektor, I ;

Prokhorov, A ;

Mukhin, A ;

Dressel, M ;

Uchida, S ;

Loidl, A .

INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, 2005, 26 (09) :1217-1240

[6] Methods of terahertz-subterahertz BWO spectroscopy of conducting materials [J].

Gorshunov, B. P. ;

Volkov, A. A. ;

Prokhorov, A. S. ;

Spektor, I. E. .

PHYSICS OF THE SOLID STATE, 2008, 50 (11) :2001-2012

[7] DYNAMIC CONDUCTIVITY AND THE COHERENCE PEAK IN THE SUBMILLIMETER SPECTRA OF SUPERCONDUCTING NBN FILMS [J].

GORSHUNOV, BP ;

FEDOROV, IV ;

KOZLOV, GV ;

VOLKOV, AA ;

SEMENOV, AD .

SOLID STATE COMMUNICATIONS, 1993, 87 (01) :17-21

[8] MEASUREMENT OF ELECTRODYNAMIC PARAMETERS OF SUPERCONDUCTING FILMS IN THE FAR-INFRARED AND SUBMILLIMETER FREQUENCY RANGES [J].

GORSHUNOV, BP ;

KOZLOV, GV ;

VOLKOV, AA ;

LEBEDEV, SP ;

FEDOROV, IV ;

PROKHOROV, AM ;

MAKHOV, VI ;

SCHUTZMANN, J ;

RENK, KF .

INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, 1993, 14 (03) :683-702

[9] High Upper Critical Fields and Evidence of Weak-Link Behavior in Superconducting LaFeAsO1-xFx Thin Films [J].

Haindl, S. ;

Kidszun, M. ;

Kauffmann, A. ;

Nenkov, K. ;

Kozlova, N. ;

Freudenberger, J. ;

Thersleff, T. ;

Haenisch, J. ;

Werner, J. ;

Reich, E. ;

Schultz, L. ;

Holzapfel, B. .

PHYSICAL REVIEW LETTERS, 2010, 104 (07)

[10] Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density [J].

Hashimoto, K. ;

Shibauchi, T. ;

Kasahara, S. ;

Ikada, K. ;

Tonegawa, S. ;

Kato, T. ;

Okazaki, R. ;

van der Beek, C. J. ;

Konczykowski, M. ;

Takeya, H. ;

Hirata, K. ;

Terashima, T. ;

Matsuda, Y. .

PHYSICAL REVIEW LETTERS, 2009, 102 (20)

← 1 2 3 4 →