Physics – Condensed Matter – Superconductivity
Scientific paper
2009-02-04
Phys. Rev. B 79, 134507 (2009)
Physics
Condensed Matter
Superconductivity
6 pages, 7 figures, New Title, minor changes, published in PRB as an editor's suggestion
Scientific paper
10.1103/PhysRevB.79.134507
Heat capacity, magnetic susceptibility, NMR, and resistivity of SrNi2P2 single crystals are presented, illustrating a purely structural transition at 325 K with no magnetism. Bulk superconductivity is found at 1.4 K. The magnitude of the transition temperature T_c, fits to the heat capacity data, the small upper critical field $H_{c2}$ = 390 Oe, and Ginzburg-Landau parameter $\kappa$ = 2.1 suggests a conventional fully gapped superconductor. With applied pressure a second structural phase transition occurs which results in an 8% reduction in the c/a ratio of lattice parameters. We find that superconductivity persists into this high pressure phase, although the transition temperature is monotonically suppressed with increasing pressure. Comparison of these Ni-P data as well as layered Fe-As and Ni-As superconductor indicates that reduced dimensionality can be a mechanism for increasing the transition temperature.
Baek Seung-Ho
Bauer Eric D.
Park Tuson
Ronning Filip
Sakai Hajime
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