Superconductivity of niobium phosphorous sulphide, NbPS, prepared at high pressure

Citation
I. Shirotani et al., Superconductivity of niobium phosphorous sulphide, NbPS, prepared at high pressure, J PHYS-COND, 11(32), 1999, pp. 6231-6237
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN journal
0953-8984 → ACNP
Volume
11
Issue
32
Year of publication
1999
Pages
6231 - 6237
Database
ISI
SICI code
0953-8984(19990816)11:32<6231:SONPSN>2.0.ZU;2-Y
Abstract
Electrical resistivity and de susceptibility of NbPS prepared at high press ure have been studied at low temperatures. The compound showed a supercondu cting transition at around 12 K. The resistance of NbPS was measured as a f unction of an applied magnetic field at constant temperature. The upper cri tical held obtained from this data was 17 tesla (T) at 0 K. This is the hig hest value reported in phosphide superconductors. The coherence length of t he compound was found to be 44.0 Angstrom. Adiabatic specific-heat measurem ents on NbPS were performed in the temperature range 2 and 20 K. The heat c apacity fitted to the expression C = gamma T +beta T-3, by a least squares analysis, yielded the values gamma = 6.5 ml mol(-1) K-2 and beta = 0.6 mJ m ol(-1) K-4. Th, Debye temperature (OD) of NbPS was found to be 330 K. The d ensity of states at the Femir level was calculated to be 0.51 states eV(-1) /atom.