Field-resilient superconductivity in atomic-layer crystalline materials
Yoichi Higashi, Shunsuke Yoshizawa, Takashi Yanagisawa, Izumi Hase, Yasunori Mawatari, Takashi Uchihashi
DOI 10.1103/PhysRevB.108.064504 · Physical Review B
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Abstract
A recent study [S. Yoshizawa et al., Nat. Commun. 12, 1462 (2021)] reported the occurrence of field-resilient superconductivity, that is, enhancement of the in-plane critical magnetic field Hc2|| beyond the paramagnetic limiting field, in atomic-layer crystalline (7×3)-In on a Si(111) substrate. The present article elucidates the origin of the observed field-resilient noncentrosymmetric superconductivity in this highly crystalline two-dimensional material. We develop the quasiclassical theory of superconductivity by incorporating the Fermi surface anisotropy together with an anisotropic spin splitting and texture specific to atomic-layer crystalline systems. In Si(111)-(7×3)-In, a typical material with a large antisymmetric spin-orbit coupling (ASOC), we show an example where the combination of the ASOC and disorder effect suppresses the paramagnetic depairing and can lead to an enhancement of Hc2|| compared to an isotropic system only when a magnetic field is applied in a particular direction due to an anisotropic spin texture. We also study the parity-mixing effect to demonstrate that the enhancement of Hc2|| is limited in the moderately clean regime because of the fragile s+p-wave pairing against nonmagnetic scattering in the case of the dominant odd-parity component of a pair wave function. Furthermore, from analysis of the transition line, we identify the field-resilience factor taking account of the scattering and suppression of paramagnetic effects and discuss the origin of the field-resilient superconductivity. Through fitting of the Hc2|| data, the normal-state electron scattering is discussed with a prime focus on the role of atomic steps on a Si(111) surface.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.05 | Pressure not reported | unknown |
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