High-pressure study of the low-Z rich superconductor Be22Re

J. Lim; A. C. Hire; Y. Quan; J. Kim; L. Fanfarillo; S. R. Xie; R. S. Kumar; C. Park; R. J. Hemley; Y. K. Vohra; R. G. Hennig; P. J. Hirschfeld; G. R. Stewart; J. J. Hamlin

doi:10.1103/PhysRevB.104.064505

High-pressure study of the low-Z rich superconductor Be22Re

J. Lim, A. C. Hire, Y. Quan, J. Kim, L. Fanfarillo, S. R. Xie, R. S. Kumar, C. Park, R. J. Hemley, Y. K. Vohra, R. G. Hennig, P. J. Hirschfeld, G. R. Stewart, J. J. Hamlin

DOI 10.1103/PhysRevB.104.064505 · Physical Review B

T1

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Abstract

With Tc∼9.6K, Be22Re exhibits one of the highest critical temperatures among Be-rich compounds. We have carried out a series of high-pressure electrical resistivity measurements on this compound to 30 GPa. The data show that the critical temperature Tc is suppressed gradually at a rate of dTc/dP=−0.05K/GPa. Using density functional theory (DFT) calculations of the electronic and phonon density of states (DOS) and the measured critical temperature, we estimate that the rapid increase in lattice stiffening in Be22Re overwhelms a moderate increase in the electron-ion interaction with pressure, resulting in the decrease in Tc. High-pressure x-ray diffraction measurements show that the ambient pressure crystal structure of Be22Re persists to at least 154 GPa.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Be22Re Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.6	Pressure unresolved	unknown
Be22Re Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.6	Pressure unresolved	onset
Be22Re Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.07	1.2 GPa	midpoint
Be22Re Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.41	30 GPa	midpoint
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure unresolved	unknown
Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.0004	Pressure unresolved	unknown
Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17.5	30 GPa	unknown
Be Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.026	Pressure unresolved	unknown
Be13U Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure unresolved	unknown
Be13Th Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure unresolved	unknown
Be13Lu Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure unresolved	unknown