Origin of the Tetragonal-to-Orthorhombic Phase Transition in FeSe: A Combined Thermodynamic and NMR Study of Nematicity

• Böhmer, A. E.

• Arai, T.

• Hardy, F.

• Hattori, T.

• Iye, T.

• Wolf, T.

• Löhneysen, H. v.

• Ishida, Kenji

• Meingast, C.

Abstract

The nature of the tetragonal-to-orthorhombic structural transition at T[s]≈90  K in single crystalline FeSe is studied using shear-modulus, heat-capacity, magnetization, and nuclear magnetic resonance 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]A[s2], suggesting a 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.

Journal

• Physical Review Letters

  Physical Review Letters 114 (2), 027001-, 2015-01-15

  American Physical Society (APS)

Keywords

• General Physics and Astronomy

Details

• CRID: 1050845760738340608
• NII Article ID: 120005555484
• NII Book ID: AA00773679
• ISSN: 00319007
• ISSN: 10797114
• DOI: 10.1103/physrevlett.114.027001
• HANDLE: 2433/196040
• Web Site: http://link.aps.org/article/10.1103/PhysRevLett.114.027001
• Web Site: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.114.027001/fulltext
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN