First Order Phase Transition and Superconductivity in BaNi2As2 Single Crystals
| Autor: | Ronning, F., Kurita, N., Bauer, E. D., Scott, B. L., Park, T., Klimczuk, T., Movshovich, R., Thompson, J. D. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | J. Phys.:Condens. Matter, 20, 342203 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0953-8984/20/34/342203 |
| Popis: | 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) \AA and c = 11.54(2) \AA. 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} \Omega-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. Comment: Published version: 4 pages, 4 figures |
| Databáze: | arXiv |
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