Physical properties of single crystalline SrSn$_{4}$ and BaSn$_{5}$ superconductors

ORAL

Abstract

We present the growths and detailed thermodynamic and transport measurements on single crystals of the recently discovered binary intermetallic superconductors, SrSn$_{4}$ and BaSn$_{5}$. Their superconducting transition temperatures T$_{c}$ are found to be 4.8 K and 4.4 K respectively. Both materials are strongly-coupled, possibly multi-band superconductors. Hydrostatic pressure causes a decrease in the superconducting transition temperature at the rate of $\approx \quad -$0.068 K/kbar for SrSn$_{4}$, and $\approx \quad -$0.053 K/kbar for BaSn$_{5}$. Band structure and upper superconducting critical field anisotropy of SrSn$_{4}$ suggest complex, multi-sheet Fermi surface formed by four bands. De Hass-van Alphen oscillations are observed in BaSn$_{5}$, which indicates a more complex topology of Fermi surface.

*Work was supported by AFOSR-MURI grant FA9550-09-1-0603; the DMSE, Office of Basic Energy Sciences, US DOE contract \# DE-AC02-07CH 11358; and NSF grant DMR-0805335.

–

Authors

  • Xiao Lin

    • Department of Physics and Astronomy, Iowa State University and Ames Laboratory

  • Sergey Bud'ko

    • Ames Laboratory US DOE and Dept. of Physics and Astronomy, ISU, Ames, IA 50011, USA and SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, 38054 Grenoble, France
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University
    • Department of Physics and Astronomy and Ames Laboratory-USDOE, Iowa State University
    • Department of Physics and Astronomy, Iowa State University and Ames Laboratory

  • German Samolyuk

    • Materials Science \& Technology Division, Oak Ridge National Laboratory

  • Milton Torikachvili

    • Department of Physics, San Diego State University
    • Dept. of Physics, San Diego State University

  • Paul Canfield

    • Ames Laboratory, Iowa State University
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University
    • Department of Physics and Astronomy and Ames Laboratory-USDOE, Iowa State University
    • Department of Physics and Astronomy, Iowa State University and Ames Laboratory
    • Ames Laboratory and Iowa State University
    • Ames Laboratory and Department of Physics, Iowa State University