Low-temperature specific heat of the superconductor Mo3Sb7

Details Low-temperature specific heat of the superconductor Mo3Sb7 Low-temperature specific heat of the superconductor Mo3Sb7

2008-03-20

arxiv.org/abs/0803.2948v1

Physics

Condensed Matter

Superconductivity

Scientific paper

The low-temperature specific heat of a superconductor Mo3Sb7 with T_c = 2.25 (0.05) K has been measured in magnetic fields up to 5 T. In the normal state, the electronic specific heat coefficient gamma_n, and the Debye temperature Theta_D are found to be 34.5(2) mJ/molK^2 and 283(5) K, respectively. The enhanced gamma_n value is interpreted due to a narrow Mo-4d band pinned at the Fermi level. The electronic specific heat in the superconducting state can be analyzed in terms a phenomenological two BCS-like gap model with the gap widths 2Delta_1/k_BT_c = 4.0 and 2Delta_2/k_BT_c = 2.5, and relative weights of the mole electronic heat coefficients gamma_1/gamma_n = 0.7 and gamma_2/gamma_n = 0.3. Some characteristic thermodynamic parameters for the studied superconductor, like the specific heat jump at T_c, DeltaC_p(T_c)/gamma_nT_c, the electron-phonon coupling constant,lambda_eph, the upper H_c2 and thermodynamic critical H_c0 fields, the penetration depth, lambda, coherence length xi, and the Ginzburg-Landau parameter kappa are evaluated. The estimated values of parameters like 2Delta/k_BT_c, DeltaC_p(T_c)/gamma_nT_c, N(E_F), and lambda_eph suggest that Mo3Sb7 belongs to intermediate-coupling regime. The electronic band structure calculations indicate that the density of states near the Fermi level is formed mainly by the Mo-4d orbitals and there is no overlapping between the Mo- 4d and Sb-sp orbitals.

Affiliated with

Also associated with

No associations

Rating

Low-temperature specific heat of the superconductor Mo3Sb7 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Low-temperature specific heat of the superconductor Mo3Sb7, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-temperature specific heat of the superconductor Mo3Sb7 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-577775