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Pressure induced evolution of superconductivity and magnetic hourglass dispersion in Fe1.02Te0.7Se0.3

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Lancon D., Tsyrulin N., Boehm M., Viennois R., Zabihzadeh S., Kusmartseva A., Giannini E., Ronnow H M,
Project Quantum Magnetism - Spinons, Skyrmions and Dipoles
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Original article (peer-reviewed)

Journal NEW JOURNAL OF PHYSICS
Volume (Issue) 17
Page(s) 043020
Title of proceedings NEW JOURNAL OF PHYSICS
DOI 10.1088/1367-2630/17/4/043020

Open Access

URL https://infoscience.epfl.ch/record/208198?ln=en
Type of Open Access Repository (Green Open Access)

Abstract

Iron based high temperature superconductors have several common features with superconducting cuprates, including the square lattice and the proximity to an antiferromagnetic phase. The magnetic excitation spectrum below T-c of Fe1.02Te0.7Se0.3 shows an hourglass-shaped dispersion with a resonance around the commensurate point. In a previous inelastic neutron scattering study, we showed that the hourglass-shaped dispersion is most likely a prerequisite for superconductivity, while the consequences are the opening of a gap and a shift of spectral weight. In this paper we follow the evolution of the hourglass shaped dispersion under applied pressure up to 12 kbar. Our results show that that the pressure-induced 37% increase of T-c is concomitant with a change in the magnetic excitation spectrum, with an increase of the hourglass energy by 38%.
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