Field Dependence of Electronic Specific Heat in Two-Band Superconductors

2001/11/10 by Noriyuki Nakai, Masanori Ichioka, Kazushige Machida · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Superconductivity in MgB2 and Alloys #cond-mat.supr-con

paper · pdf · doi:10.1143/jpsj.71.23

published as J. Phys. Soc. Jpn. 71, 23 (2002) · 5 pages, 4 figures, to be published in J. Phys. Soc. Jpn

arxiv created 2001/11/10 · openalex publication_date 2002/01/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The vortex structure is studied in light of MgB₂ theoretically based on a two-band superconducting model by means of Bogoliubov-de Gennes framework. The field dependence of the electronic specific heat coefficient γ (H) is focused. The exponent α in γ (H)∝ H^α is shown to become smaller by adjusting the gap ratio of the two gaps on the major and minor bands. The observed extremely small value α∼ 0.23 could be explained reasonably well in this two-band model with the gap ratio ∼ 0.3.

Citations

• The complex nature of superconductivity in MgB2 as revealed by the reduced total isotope effect
• Mixed-state quasiparticle spectrum ford-wave superconductors
• Vortex structure in chiralp-wave superconductors
• Order Parameter ofMgB2: A Fully Gapped Superconductor
• Coexistence of covalent and metallic bonding in the boron intercalation superconductorMgB2

Cited by

• Field Dependence of the Vortex Core Size in a Multiband Superconductor