Imaging the electron-boson coupling in superconducting FeSe films using a scanning tunneling microscope.

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Abstract

Scanning tunneling spectroscopy has been used to reveal signatures of a bosonic mode in the local quasiparticle density of states of superconducting FeSe films. The mode appears below Tc as a "dip-hump" feature at energy Ω∼4.7kBTc beyond the superconducting gap Δ. Spectra on strained regions of the FeSe films reveal simultaneous decreases in Δ and Ω. This contrasts with all previous reports on other high-Tc superconductors, where Δ locally anticorrelates with Ω. A local strong coupling model is found to reconcile the discrepancy well, and to provide a unified picture of the electron-boson coupling in unconventional superconductors.

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Journal

Journal ID (iso-abbrev): Phys. Rev. Lett.

Title: Physical review letters

Publisher: American Physical Society (APS)

ISSN (Electronic): 1079-7114

ISSN (Print): 0031-9007

Publication date (Electronic): Feb 07 2014

Volume: 112

Issue: 5

Affiliations

[1 ] State Key Laboratory for Surface Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China and State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China and Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

[2 ] State Key Laboratory for Surface Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

[3 ] State Key Laboratory for Surface Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China and State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.

[4 ] State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.

[5 ] Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

Article

DOI: 10.1103/PhysRevLett.112.057002

PubMed ID: 24580624

SO-VID: 45310458-c101-49c0-a743-6fb824571d8e

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