Intrinsic Charge Dynamics in High-Tc AFeAs(O,F) Superconductors

被引：8

作者：

Charnukha, A. ^{[1
,2
,3
]}

Proepper, D. ^{[3
]}

Zhigadlo, N. D. ^{[4
,5
]}

Naito, M. ^{[6
]}

Schmidt, M. ^{[7
]}

Wang, Zhe ^{[7
]}

Deisenhofer, J. ^{[7
]}

Loidl, A. ^{[7
]}

Keimer, B. ^{[3
]}

Boris, A. V. ^{[3
]}

Basov, D. N. ^{[1
,8
]}

机构：

[1] Univ Calif San Diego, Phys Dept, La Jolla, CA 92093 USA

[2] IFW, Leibniz Inst Solid State & Mat Res, D-01069 Dresden, Germany

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

[4] ETH, Lab Solid State Phys, CH-8093 Zurich, Switzerland

[5] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland

[6] Tokyo Univ Agr & Technol, Dept Appl Phys, Koganei, Tokyo 1848588, Japan

[7] Univ Augsburg, Expt Phys 5, Ctr Elect Correlat & Magnetism, Inst Phys, D-86159 Augsburg, Germany

[8] Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 08期

基金：

美国国家科学基金会;

关键词：

HIGH-TEMPERATURE SUPERCONDUCTIVITY; OPTICAL-PROPERTIES; SINGLE-CRYSTALS; FERMI-SURFACE; FESE FILMS; CONDUCTIVITY; MAGNETISM; ORIGIN; SRTIO3; STATE;

D O I：

10.1103/PhysRevLett.120.087001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first determination of the in-plane complex optical conductivity of 1111 high-T-c superconducting iron oxypnictide single crystals PrFeAs(O,F) and thin films SmFeAs(O,F) by means of conventional and microfocused infrared spectroscopy, ellipsometry, and time-domain THz transmission spectroscopy. A strong itinerant contribution is found to exhibit a dramatic difference in coherence between the crystal and the film. Using extensive temperature-dependent measurements of THz transmission, we identify a previously undetected 2.5-meV collective mode in the optical conductivity of SmFeAs(O,F), which is strongly suppressed at T-c and experiences an anomalous T-linear softening and narrowing below T* approximate to 110 K >> T-c. The suppression of the infrared absorption in the superconducting state reveals a large optical superconducting gap with a similar gap ratio 2 Delta/k(B)T(c) approximate to 7 in both materials, indicating strong pairing.

引用

页数：6

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