First Order Phase Transition and Superconductivity in BaNi2As2 Single Crystals

F. Ronning; N. Kurita; E. D. Bauer; B. L. Scott; T. Park; T. Klimczuk; R. Movshovich; J. D. Thompson

doi:10.1088/0953-8984/20/34/342203

paper

First Order Phase Transition and Superconductivity in BaNi2As2 Single Crystals

arXiv:0807.3788 · doi:10.1088/0953-8984/20/34/342203

Abstract

We report the synthesis and physical properties of single crystals of stoichiometric BaNi2As2 that crystalizes in the ThCr2Si2 structure with lattice parameters a = 4.112(4) Åand c = 11.54(2) Å. Resistivity and heat capacity show a first order phase transition at T_0 = 130 K with a thermal hysteresis of 7 K. The Hall coefficient is weakly temperature dependent from room temperature to 2 K where it has a value of -4x10^{-10} Ω-cm/Oe. Resistivity, ac-susceptibility, and heat capacity find evidence for bulk superconductivity at T_c = 0.7 K. The Sommerfeld coefficient at T_c is 11.6 \pm 0.9 mJ/molK^2. The upper critical field is anisotropic with initial slopes of dH_{c2}^{c}/dT = -0.19 T/K and dH_{c2}^{ab}/dT = -0.40 T/K, as determined by resistivity.

Published version: 4 pages, 4 figures

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