Cocktail effect on superconductivity in hexagonal high-entropy alloys

Bin Liu; Wuzhang Yang; Guang-Han Cao; Zhi Ren

doi:10.1103/PhysRevMaterials.8.114802

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Cocktail effect on superconductivity in hexagonal high-entropy alloys

Bin Liu, Wuzhang Yang, Guang-Han Cao, Zhi Ren

DOI 10.1103/PhysRevMaterials.8.114802 · Physical Review Materials

T1

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Abstract

We report the study of the cocktail effect on superconductivity in high-entropy alloys (HEAs), using hexagonal close-packed HEAs as a prototype system. Compared with the compositional averages of the constituent elements, the superconducting transition temperature Tc is enhanced by from a factor of about 2 to over one order of magnitude. This Tc enhancement correlates with the reduction in the Debye temperature, underlining the importance of phonon softening in triggering the cocktail effect. Furthermore, we show that the Tc in these HEAs is governed by the average phonon frequency and electron-phonon coupling strength, the latter of which scales linearly with the inverse HEA molecular weight and is progressively weakened with increasing mixing entropy. Our study paves the way toward quantitative understanding of the superconductivity in HEAs.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Mo50Ru20Rh15Pd15 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5	Pressure not reported	unknown
Mo40Ru40Rh10Pd10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3	Pressure not reported	unknown
MoReRuRh Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.5	Pressure not reported	unknown
(MoReRuRh)0.95Ti0.05 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.6	Pressure not reported	unknown
(MoReRuRh)0.9Ti0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.7	Pressure not reported	unknown
Nb10Mo35Ru35Rh10Pd10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.58	Pressure not reported	unknown
Nb15Mo32.5Ru32.5Rh10Pd10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.19	Pressure not reported	unknown
Nb20Mo30Ru30Rh10Pd10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.1	Pressure not reported	unknown
Nb5Mo35Re15Ru35Rh10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.54	Pressure not reported	unknown
Nb5Mo30Re20Ru35Rh10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.69	Pressure not reported	unknown
Nb5Mo25Re25Ru35Rh10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.51	Pressure not reported	unknown
Nb5Mo20Re30Ru35Rh10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.46	Pressure not reported	unknown
(MoReRu)0.916(PdPt)0.084 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.17	Pressure not reported	unknown
(MoReRu)0.834(PdPt)0.166 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.91	Pressure not reported	unknown
(MoReRu)0.75(PdPt)0.25 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.22	Pressure not reported	unknown
(MoReRu)0.66(PdPt)0.34 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.64	Pressure not reported	unknown
MoReRuRhPt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.82	Pressure not reported	unknown
MoReRuIrPt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.06	Pressure not reported	unknown
MoReRuRhPd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.38	Pressure not reported	unknown
MoReRuIrPd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.61	Pressure not reported	unknown
NbMoReRuRhPt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.95	Pressure not reported	unknown
NbMoReRuIrPt Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.84	Pressure not reported	unknown
Ru0.35Os0.35Mo0.1W0.1Zr0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.9	Pressure not reported	unknown
Mo35W10Re20Ru30Pd5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.32	Pressure not reported	unknown
MoReRu Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.25	Pressure not reported	unknown
Mo0.12Re0.88 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.5	Pressure not reported	unknown