Investigate the effect of anisotropic order parameter on the specific heat of anisotropic two-band superconductors

The effect of anisotropic order parameter to specific heat of anisotropic two-band superconductors in BCS weak-coupling limit are investigated. An analytical specific heat jump and the numerical specific heat are shown by using anisotropic order parameters, and the electron-phonon interaction and non-electron-phonon interaction. The two model of anisotropic order parameters are used for numerical calculation that we find little effect to the numerical results . The specific heat jump of, and superconductors can fit well with the both of them. By comparing to experimental data overall range of temperature, the best fit is ,, and superconductors, respectively.Comment: 10 pages, 3 fingure

Superconductivity and Structural of the New Er358 Materials

The Er358 superconductor was synthesized via the standard solid-state reaction method and demonstrated an average onset critical temperature of 95.48 K and an offset critical temperature of 89.70 K. Its crystal structure was classified into two groups: superconducting and non-superconducting compounds, possessing orthorhombic structures corresponding to the Pmmm and Pbnm space groups, respectively. The ratio of superconducting to non-superconducting compounds was 1:2, and their respective lattice parameters were a=3.8248 Å, b=3.8770 Å, c=31.666 Å, and a=7.1006 Å, b=12.139 Å, c=5.6418 Å. The samples exhibited smooth and dense surfaces, and their element distribution was analyzed via EDX mapping. The Cu2+/Cu3+ ratio was 0.0527, and the oxygen content deficiency was 0.300. The oxygen content was determined to be 17.7 using iodometric titration. Additionally, two endothermic peaks were observed in the heat reaction at 935°C and 1,050°C