1. Superconductivity in a new T2-phase Mo5GeB2
- Author
-
Genfu Chen, Zhi-An Ren, Meng-Hu Zhou, Qing-Song Yang, and Bin-Bin Ruan
- Subjects
Superconductivity ,Materials science ,Condensed matter physics ,Mechanical Engineering ,Metals and Alloys ,02 engineering and technology ,Crystal structure ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Heat capacity ,0104 chemical sciences ,Magnetization ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Electrical resistivity and conductivity ,Condensed Matter::Superconductivity ,Phase (matter) ,Boride ,Materials Chemistry ,0210 nano-technology ,Ternary operation - Abstract
We report the crystal structure and superconductivity of a new ternary boride Mo5GeB2. Mo5GeB2 crystallizes in a Cr5B3-type structure with a space group of I4/mcm (No. 140). The lattice parameters are a = 6.0721(1) A, and c = 11.1173(2) A. A type-II superconductivity of Tc = 5.8 K is revealed by resistivity, magnetization, and heat capacity measurements. The upper and lower critical fields are 0.52 T and 77.1 mT, respectively. The temperature dependence of low temperature specific heat follows the description of a BCS superconductor with an isotropic s-wave gap (Δ0 = 0.93 meV). However, both the values of the normalized specific heat change (ΔCe/γTc = 1.63) and the coupling strength (Δ0/kBTc = 1.87) exceed the BCS weak-coupling limit, indicating an intermediate coupling in Mo5GeB2.
- Published
- 2021
- Full Text
- View/download PDF