Origin of the tetragonal-to-orthorhombic (nematic) phase transition in FeSe: a combined thermodynamic and NMR study

A. E. B\"ohmer; C. Meingast; F. Hardy; H. v. L\"ohneysen; K. Ishida; T. Arai; T. Hattori; T. Iye; T. Wolf

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Origin of the tetragonal-to-orthorhombic (nematic) phase transition in FeSe: a combined thermodynamic and NMR study

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arxiv 1407.5497 v1 pith:OD4EXLO6 submitted 2014-07-21 cond-mat.supr-con

A. E. Böhmer , T. Arai , F. Hardy , T. Hattori , T. Iye , T. Wolf , H. v. Löhneysen , K. Ishida

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C. Meingast

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keywords transitionfesenematicphaseshear-modulusstructuraltetragonal-to-orthorhombicaccompanied

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abstract

The nature of the tetragonal-to-orthorhombic structural transition at $T_s\approx90$ K in single crystalline FeSe is studied using shear-modulus, heat-capacity, magnetization and NMR measurements. The transition is shown to be accompanied by a large shear-modulus softening, which is practically identical to that of underdoped Ba(Fe,Co)$_2$As$_2$, suggesting very similar strength of the electron-lattice coupling. On the other hand, a spin-fluctuation contribution to the spin-lattice relaxation rate is only observed below $T_s$. This indicates that the structural, or "nematic", phase transition in FeSe is not driven by magnetic fluctuations.

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