Anisotropic fluctuations and quasiparticle excitations in FeSe 0.5 Te0.5

A. Serafin, A. I. Coldea, A. Y. Ganin, M. J. Rosseinsky, K. Prassides, D. Vignolles, A. Carrington

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25 Citations (Scopus)

Abstract

We present data for the temperature dependence of the magnetic penetration depth λ (T), heat capacity C (T), resistivity ρ (T), and magnetic torque τ for highly homogeneous single-crystal samples of Fe1.0 Se0.44 (4) Te0.56 (4). λ (T) was measured down to 200 mK in zero field. We find λ (T) follows a power law Δλ∼ Tn with n=2.2±0.1. This is similar to some 122 iron arsenides and likely results from a sign-changing pairing state combined with strong scattering. Magnetic fields of up to B=55 or 14 T were used for the τ (B) and C (T) /ρ (T) measurements, respectively. The specific heat, resistivity, and torque measurements were used to map out the (H,T) phase diagram in this material. All three measurements were conducted on exactly the same single-crystal sample so that the different information revealed by these probes is clearly distinguished. Heat-capacity data strongly resemble those found for the high- Tc cuprates, where strong fluctuation effects wipe out the phase transition at Hc2. Unusually, here we find the fluctuation effects appear to be strongly anisotropic.

Original languageEnglish
Article number104514
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number10
DOIs
Publication statusPublished - 2010 Sep 20

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Serafin, A., Coldea, A. I., Ganin, A. Y., Rosseinsky, M. J., Prassides, K., Vignolles, D., & Carrington, A. (2010). Anisotropic fluctuations and quasiparticle excitations in FeSe 0.5 Te0.5. Physical Review B - Condensed Matter and Materials Physics, 82(10), [104514]. https://doi.org/10.1103/PhysRevB.82.104514