Bauer, E., Khan, R. T., Michor, H., Royanian, E., Grytsiv, A., Melnychenko-Koblyuk, N., Rogl, P., Reith, D., Podloucky, R., Scheidt, E.-W., Wolf, W., & Marsman, M. (2009). BaPtSi₃: A noncentrosymmetric BCS-like superconductor. Physical Review B, 80(064504). https://doi.org/10.1103/physrevb.80.064504
E138-04 - Forschungsbereich Quantum Materials E138-03 - Forschungsbereich Functional and Magnetic Materials
-
Journal:
Physical Review B
-
ISSN:
2469-9950
-
Date (published):
2009
-
Number of Pages:
7
-
Publisher:
AMER PHYSICAL SOC
-
Peer reviewed:
Yes
-
Keywords:
Condensed Matter Physics; Electronic, Optical and Magnetic Materials; density functional theory; annealing; band structure; Fermi surface; lattice constants; space groups; barium alloys; heavy fermion superconductors; platinum alloys; silicon alloys; superconducting critical field; superconducting transitions
-
Abstract:
By investigations of phase relations in the alloy system Ba-Pt-Si at 900 °C we observe the formation of the compound BaPtSi3, which crystallizes in the noncentrosymmetric BaNiSn3 structure type. Its space group is I4mm with the tetragonal lattice parameters a=0.44094(2)nm and c=1.0013(2)nm for the arc-melted compound annealed at 900 °C. The characterization of the physical properties of BaPtSi3 reveals a superconducting transition at 2.25 K with an upper critical field at T=0 K of [approximate]0.05 T. For analyzing the electronic structure, density-functional theory calculations are performed yielding very good agreement between theory and experiment for the structural properties. From relativistic electronic-structure calculations, Fermi surface nesting features are found for two characteristic double sets of bands. The spin-orbit splitting of the relativistic electronic bands is in general rather small at Fermi energy and, therefore, superconductivity adheres to an almost undisturbed BCS state.
en
Research Areas:
Special and Engineering Materials: 30% Metallic Materials: 30% Quantum Many-Body Systems: 40%
