Quantum oscillations and upper critical magnetic field of the iron-based superconductor FeSe

Alain Audouard; Fabienne Duc; Loïc Drigo; Pierre Toulemonde; Sandra Karlsson; Pierre Strobel; André Sulpice

doi:10.1209/0295-5075/109/27003

All issues

Volume 109 / No 2 (January 2015)

EPL, 109 2 (2015) 27003

Abstract

Issue		EPL Volume 109, Number 2, January 2015


Article Number		27003
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/109/27003
Published online		04 February 2015

EPL, 109 (2015) 27003

Quantum oscillations and upper critical magnetic field of the iron-based superconductor FeSe

Alain Audouard¹, Fabienne Duc¹, Loïc Drigo¹, Pierre Toulemonde²^,3, Sandra Karlsson²^,3, Pierre Strobel²^,3 and André Sulpice⁴^,5

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

Abstract

Shubnikov-de Haas (SdH) oscillations and upper critical magnetic field (H_c₂) of the iron-based superconductor FeSe $(T_c = 8.6\ \text{K})$ 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 (H_c2) for magnetic field applied both parallel $(\textbf{H}\,\|\,ab)$ and perpendicular $(\textbf{H}\,\|\,c)$ 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 $\textbf{H}\,\|\,c$ , a Pauli paramagnetic contribution is evidenced for $\textbf{H}\,\|\,ab$ with Maki parameter $\alpha = 2.1$ , corresponding to Pauli field $H_{P} = 36.5\ \text{T}$ .

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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