Superconductivity and the Effects of Pressure and Structure in Single Crystalline SrNiP
arXiv:0902.0663 · doi:10.1103/PhysRevB.79.134507
Abstract
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 = 390 Oe, and Ginzburg-Landau parameter = 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.
6 pages, 7 figures, New Title, minor changes, published in PRB as an editor's suggestion
References in corpus (11)
- Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
- Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
- Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
- Doping-dependent Phase Diagram of LaO{\it M}As ({\it M}=V--Cu) and Electron-type Superconductivity near Ferromagnetic Instability
- Pressure-induced superconductivity in single crystal CaFe2As2
- First Order Phase Transition and Superconductivity in BaNi2As2 Single Crystals
- Nickel-based phosphide superconductor with infinite-layer structure, BaNi2P2
- Nickel-based layered superconductor, LaNiOAs
- Strong-coupling superconductivity in layered nickel-based LaOFNiAs
- Density functional study of BaNiAs: Electronic structure, phonons and electron-phonon superconductivity
- Electron Phonon Superconductivity in LaNiOP