Wirtualne seminarium: Non-s-wave superconductivity in noncentrosymmetric ThCoC2

Akademickie Centrum Materiałów i Nanotechnologii AGH zaprasza na wirtualne seminarium z cyklu „Krakow Condensed Matter Seminar”, które odbędzie się 17 marca 2021 r. o godz. 9.00.

Referat pt. Non-s-wave superconductivity in noncentrosymmetric ThCoC2 wygłosi dr hab. inż. Bartłomiej Wiendlocha, prof. AGH (Wydział Fizyki i Informatyki Stosowanej).

Link dla uczestników


ThCoC2 is a noncentrosymmetric superconductor, in which recently, superconductivity was proposed to be a nodal d-wave and mediated by the spin fluctuations [1]. In our work [2] electronic structure, phonons and electron-phonon coupling are studied in ThCoC2 on the basis of ab initio computations. The thermodynamic properties of the superconducting state are determined numerically by solving Eliashberg equations. Our results support the electron-phonon coupling scenario of superconductivity in ThCoC2, in contrast to [1]. However, calculated temperature dependence of the electronic specific heat and magnetic penetration depth strongly deviate from the BCS model. Moreover, neither the BCS model nor the presented Eliashberg solutions can explain their experimentally observed temperature dependence, supporting the non-s-wave picture of superconductivity in ThCoC2. To resolve the pairing mechanism two experimental measurements are proposed.

[1] A. Bhattacharyya et al. Phys. Rev. Lett. 122, 147001 (2019).
[2] G. Kuderowicz, P. Wójcik, B. Wiendlocha, to be published (2021).