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Lecture Andres Cano

Rooster

WanneerWaar
13 september 2012 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Andres Cano
Affiliation: European Synchrotron Radiation Facility (ESRF), Grenoble, France
Title: Magnetoelastic coupling in iron-based superconductors
Date: Thu Sep 13, 2012
Start: 11.00
Location: FWN-Building 5114.0004
Host: M. Mostovoy
Telephone: +31 50 363 3419

Abstract

The surprising discovery of superconductivity in fluorine-doped arsenic-oxide LaO1-xFxFeAs [1] has established a new class of high-temperature superconductors [2]. The normal state of these systems displays an intriguing interplay between structural and magnetic transitions that persists in the superconducting region of the phase diagram. In this talk I will discuss how this interplay is largely dominated by symmetry-specific magnetoelastic couplings [3]. I will show, in particular, how these couplings are behind some recent experimental findings such as i) the existence of tricritical points in the generic phase diagram of these systems [4] and ii) the variations of transition temperatures induced by uniaxial pressure [5].

 

[1] Y. Kamihara et al., J. Am. Chem. Soc. 130, 3296 (2008).

[2] For reviews, see e.g. D.C. Johnston, Advances in Physics 59, 803 (2010) ; P. J. Hirschfeld et al., Rep. Prog. Phys. 74, 124508 (2011).

[3] A. Cano, M. Civelli, I. Eremin, and I. Paul, Phys. Rev. B, 82, 020408(R) (2010); I. Paul, A. Cano and K. Sengupta, ibid. 83, 115109 (2011); A. Cano and I. Paul, ibid. 85, 155133 (2012).

[4] Kim et al. Phys. Rev. B 83, 134522 (2011).

[5] Dhital et al., Phys. Rev. Lett. 108, 087001 (2012)

Laatst gewijzigd:22 oktober 2012 14:31