Multi-band description of the specific heat and thermodynamic critical field in MgB2 superconductor

2018 ◽  
Vol 536 ◽  
pp. 726-729
Author(s):  
R. Szcześniak ◽  
M.W. Jarosik ◽  
P. Tarasewicz ◽  
A.P. Durajski
Keyword(s):  
Specific Heat ◽  
Critical Field ◽  
Mgb2 Superconductor ◽  
Thermodynamic Critical Field ◽  
Multi Band

scholarly journals The thermodynamic critical field and specific heat of superconducting state in phosphorene under strain

2019 ◽  
Vol 33 (07) ◽  
pp. 1950079
Author(s):  
Kamila A. Szewczyk ◽  
Adam Z. Kaczmarek ◽  
Ewa A. Drzazga
Keyword(s):  
Specific Heat ◽  
Critical Field ◽  
Superconducting State ◽  
Bcs Theory ◽  
High Electron ◽  
Electron Phonon Coupling ◽  
Difference Formula ◽  
Wide Range ◽  
State Formula ◽  
Thermodynamic Critical Field

In this work, we present the thermodynamic properties of the superconducting state in phosphorene. In particular, we have examined the electron doped [Formula: see text] and biaxially strained (4%) monolayer of black phosphorous, which exhibits best thermodynamic stability and highest superconducting critical temperature [Formula: see text] among all monolayer phosphorene structures. Due to the confirmed electron–phonon pairing mechanism and relatively high electron–phonon coupling constant in the studied material, we carried out the calculations in the framework of the Eliashberg formalism for a wide range of the Coulomb pseudopotential [Formula: see text]. We have determined the thermodynamic critical field [Formula: see text], and the specific heat difference [Formula: see text] between superconducting [Formula: see text] and normal state [Formula: see text] as the functions of the temperature. In addition, we have calculated the dimensionless parameters [Formula: see text]/[Formula: see text] and [Formula: see text]/[Formula: see text], and also found their significant deviation from the expectations of the BCS theory. In particular, [Formula: see text] and [Formula: see text] for [Formula: see text].

scholarly journals SPECIFIC HEAT AND THERMODYNAMIC CRITICAL FIELD FOR CALCIUM UNDER THE PRESSURE AT 120 GPa

2012 ◽  
Vol 26 (08) ◽  
pp. 1250050 ◽  
Author(s):  
RADOSŁAW SZCZȨSNIAK ◽  
ARTUR P. DURAJSKI ◽  
MARCIN W. JAROSIK
Keyword(s):  
Free Energy ◽  
Numerical Analysis ◽  
Specific Heat ◽  
Critical Field ◽  
Thermodynamic Functions ◽  
Energy Difference ◽  
Free Energy Difference ◽  
Characteristic Values ◽  
Thermodynamic Critical Field ◽  
Made In

In the paper, the thermodynamic parameters of the superconducting state for Calcium under the pressure at 120 GPa have been determined. The numerical analysis has been made in the framework of the Eliashberg approach. In particular, the free energy difference between the superconducting and normal state has been calculated. On the basis of the obtained results, the specific heat for the superconducting (CS) and normal (CN) state, as well as the thermodynamic critical field (HC) have been determined. It has been shown that the characteristic values of the considered thermodynamic functions do not obey the BCS universal laws: ΔC(TC)/CN(TC) = 2.48 and [Formula: see text].

Specific heat and critical field ofLuNi2B2C

1994 ◽  
Vol 50 (5) ◽  
pp. 3485-3486 ◽  
Author(s):  
J. S. Kim ◽  
W. W. Kim ◽  
G. R. Stewart
Keyword(s):  
Specific Heat ◽  
Critical Field
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