Superconductivity at 5 K in NdO0.5F0.5BiS2
Abstract
We report appearance of superconductivity at 5 K in NdO0.5F0.5BiS2 and supplement the discovery [Demura et al., e-print arXiv:1207.5248] of the same in layered sulfide based compound. Detailed structural analysis showed that the studied compound is crystallized in tetragonal P4/nmm space group with lattice parameters a = 3.9911(3) Å and c = 13.3830(2) Å. Bulk superconductivity is established in NdO0.5F0.5BiS2 at 5 K by both transport and magnetic measurements. Electrical transport measurements showed superconducting Tc onset at 5.2 K and Tc (ρ = 0) at 4.7 K. Under applied magnetic field, both Tc onset and Tc (ρ = 0) decrease to lower temperatures and an upper critical field [Hc2(0)] of above 23 kOe is estimated. Isothermal magnetization exhibited typical type-II behavior with lower critical field (Hc1) of around 25 Oe. Specific heat [Cp(T)] is investigated in the temperature range of 1.9-50 K in zero external magnetic field. A Schottky-type anomaly is observed at low temperature below 7 K.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- February 2013
- DOI:
- 10.1063/1.4790322
- arXiv:
- arXiv:1208.3077
- Bibcode:
- 2013JAP...113e6102J
- Keywords:
-
- bismuth compounds;
- crystal growth;
- crystal structure;
- crystallisation;
- entropy;
- high-temperature superconductors;
- lattice constants;
- magnetic superconductors;
- magnetic susceptibility;
- magnetisation;
- neodymium compounds;
- Schottky anomaly;
- space groups;
- superconducting critical field;
- type II superconductors;
- 74.25.Ha;
- 74.72.-h;
- 81.10.Jt;
- 74.25.F-;
- 61.66.Fn;
- 74.25.Bt;
- Magnetic properties;
- Cuprate superconductors;
- Growth from solid phases;
- Inorganic compounds;
- Thermodynamic properties;
- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 10 pages text + Figs (New Version):comments/suggestion welcome (awana@mail.nplindia.ernet.in)