Volume 109, Number 2, January 2015
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 February 2015|
Quantum oscillations and upper critical magnetic field of the iron-based superconductor FeSe
1 Laboratoire National des Champs Magnétiques Intenses (UPR 3228 CNRS, INSA, UJF, UPS) 143 avenue de Rangueil, F-31400 Toulouse, France
2 Univ. Grenoble Alpes, Institut NÉEL - F-38000 Grenoble, France
3 CNRS, Institut NÉEL - F-38000 Grenoble, France
4 Univ. Grenoble Alpes, CRETA - F-38000 Grenoble, France
5 CNRS, CRETA - F-38000 Grenoble, France
Received: 19 September 2014
Accepted: 6 January 2015
Shubnikov-de Haas (SdH) oscillations and upper critical magnetic field (Hc2) of the iron-based superconductor FeSe have been studied by tunnel diode oscillator-based measurements in magnetic fields of up to 55 T and temperatures down to 1.6 K. Several Fourier components enter the SdH oscillations spectrum with frequencies definitely smaller than predicted by band structure calculations indicating band renormalization and reconstruction of the Fermi surface at low temperature, in line with previous ARPES data. The Werthamer-Helfand-Hohenberg model accounts for the temperature dependence of (Hc2) for magnetic field applied both parallel and perpendicular to the iron conducting plane, suggesting that one band mainly controls the superconducting properties in magnetic fields despite the multiband nature of the Fermi surface. Whereas Pauli pair breaking is negligible for , a Pauli paramagnetic contribution is evidenced for with Maki parameter , corresponding to Pauli field .
PACS: 74.70.Xa – Pnictides and chalcogenides / 71.18.+y – Fermi surface: calculations and measurements; effective mass, g factor / 74.25.Dw – Superconductivity phase diagrams
© EPLA, 2015
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