Effect of spin fluctuations on superconductivity in V and Nb: A first-principles study

Kentaro Tsutsumi; Yuma Hizume; Mitsuaki Kawamura; Ryosuke Akashi; Shinji Tsuneyuki

doi:10.1103/PhysRevB.102.214515

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Effect of spin fluctuations on superconductivity in V and Nb: A first-principles study

Kentaro Tsutsumi, Yuma Hizume, Mitsuaki Kawamura, Ryosuke Akashi, Shinji Tsuneyuki

DOI 10.1103/PhysRevB.102.214515 · Physical Review B

T1

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Abstract

We study the superconductivity in typical d-band elemental superconductors V and Nb with the recently developed nonempirical computational scheme based on the density functional theory for superconductors. The effect of ferromagnetic fluctuation (paramagnon) on the superconducting transition temperature Tc, which, in principle, suppresses the s-wave superconducting pairing, is quantified without any empirical parameter. We show that the strong paramagnon effect cancels the Tc-enhancing effects of the phonon-mediated pairing and dynamical screened Coulomb interaction.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.5	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.14	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.6	Pressure not reported	unknown