Anisotropic fluctuations and quasiparticle excitations in FeSe 0.5 Te0.5

Serafin, A, Coldea, AI, Ganin, AY, Rosseinsky, MJ ORCID: 0000-0002-1910-2483, Prassides, K, Vignolles, D and 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-. ISSN 1098-0121, 1550-235X

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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 Fe<inf>1.0</inf> Se<inf>0.44</inf> (4) Te<inf>0.56</inf> (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. © 2010 The American Physical Society.

Item Type:	Article
Additional Information:	10 pages, 9 figures, submitted to PRB
Uncontrolled Keywords:	cond-mat.supr-con, cond-mat.supr-con
Depositing User:	Symplectic Admin
Date Deposited:	27 Jul 2016 14:55
Last Modified:	21 Apr 2026 23:17
DOI:	10.1103/PhysRevB.82.104514
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3002577
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