Specific heat in strongly hole-doped iron-based superconductors

Chichinadze, Dmitry V.; Chubukov, Andrey V.

doi:10.1103/physrevb.99.024509

Title: Specific heat in strongly hole-doped iron-based superconductors

Journal Article · 22 January 2019 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.99.024509 · OSTI ID:1612172

Chichinadze, Dmitry V. ^[1]; Chubukov, Andrey V. ^[2]

Univ. of Minnesota, Minneapolis, MN (United States); DOE/OSTI
Univ. of Minnesota, Minneapolis, MN (United States)

We compute specific heat C(T) in a strongly hole-doped Fe-based superconductor, like KFe₂As₂, which has only hole pockets. We model the electronic structure by a three-orbital/three-pocket model with two smaller hole pockets made out of d_xz and d_yz orbitals and a larger pocket made out of d_xy orbital. We use as an input the experimental fact that the mass of d_xy fermion is several times heavier than that of d_xz/d_yz fermions. We argue that the heavy d_xy band gives the largest contribution to the specific heat in the normal state, but the superconducting gap on the d_xy pocket is much smaller than that on d_xz/d_yz pockets. We argue that in this situation the jump of C(T) at T_c is determined by d_xz/d_yz fermions, and the ratio (C_s–C_n)/C_n is a fraction of that in a one-band BCS superconductor. At T < T_c,C(T) remains relatively flat down to some T*, below which it rapidly drops. This behavior is consistent with the data for KFe₂As₂ and related materials. We use one-parameter model for the interactions and fix this only parameter by matching the experimental ratio of the gaps on the two d_xz/d_yz pockets. Furthermore, we argue that the resulting parameter-free model reproduces quantitatively the data on C(T) for KFe₂As₂. We further argue that the very existence of a finite T* < T_c favors s^+– gap structure over d-wave, because in the latter case T* would almost vanish.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014402

OSTI ID:: 1612172

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 99; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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