Three-gap superconductivity in two-dimensional InB2/InB4 films

Zhuchi Wang; Shuming Zeng; Yinchang Zhao; Xinming Wang; Jun Ni

doi:10.1103/PhysRevB.104.174519

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Three-gap superconductivity in two-dimensional InB2/InB4 films

Zhuchi Wang, Shuming Zeng, Yinchang Zhao, Xinming Wang, Jun Ni

DOI 10.1103/PhysRevB.104.174519 · Physical Review B

T1

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Abstract

In recent years, multigap superconductors have attracted much attention since the discovery of novel two-gap superconductivity with transition temperature Tc∼39K in bulk MgB2. Based on the first-principles calculation and anisotropic Migdal-Eliashberg theory, we conduct a study on a series of two-dimensional (2D) boron-based materials with doped metal atoms to search for multigap superconductors. We find that InB2 monolayer films and InB4 trilayer films are dynamically stable but not synthesized experimentally yet. An evident three-gap superconductor with high Tc∼ 41.5 K is obtained in a InB2 monolayer film. Similarly, InB4 trilayer film is a novel superconductor with three distinct superconducting gaps and a high Tc∼ 53 K. The superconductivity in both 2D films originates mainly from the covalent-state-driven metallization. In addition, the effect of biaxial strain on the superconducting behavior of InB4 trilayer films is also involved. The InB4 trilayer films stay dynamically stable under biaxial tensile strain of −3%–6%, and the highest Tc boosts to 64 K under the biaxial tensile strain of ∼4%. Meanwhile, we also find that the GeB4 and ZnB4 trilayer films are two-gap superconductors with high Tc∼ 48.5 and 32 K, respectively.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
InB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	41.5	Pressure not reported	unknown
InB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	53	Pressure not reported	unknown
InB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	64	Pressure not reported	unknown
GeB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	48.5	Pressure not reported	unknown
ZnB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	50	Pressure not reported	unknown
MgB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	52	Pressure not reported	unknown
AlB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26.5	Pressure not reported	unknown
AlB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	47	Pressure not reported	unknown