Lattice parameter and Tc dependence of sintered MgB2 superconductor on hydrostatic pressure

Jie Tang; Lu-Chang Qin; Akiyuki Matsushita; Yoshihiko Takano; Kazumasa Togano; Hijiri Kito; Hideo Ihara

doi:10.1103/PhysRevB.64.132509

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Lattice parameter and Tc dependence of sintered MgB2 superconductor on hydrostatic pressure

Jie Tang, Lu-Chang Qin, Akiyuki Matsushita, Yoshihiko Takano, Kazumasa Togano, Hijiri Kito, Hideo Ihara

DOI 10.1103/PhysRevB.64.132509 · Physical Review B

T1

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Abstract

Hydrostatic pressure up to 10 GPa has been applied to determine the lattice compressibility and the dependence of transition temperature Tc of an MgB2 superconducting material that shows a very narrow transition range when prepared by high-pressure sintering. The transition temperature Tc decreases with increasing pressure at a rate of 1.03 K/GPa. The material has a bulk modulus 172 GPa and the unit cell of the MgB2 crystals shows an anisotropic compressibility with its c axis appearing more compressible than the a/b axis. The experimental results are discussed within the framework of the BCS theory, which gives rise to estimates in good agreement with the experimental results.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39.6	Pressure unresolved	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure unresolved	unknown
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23.2	Pressure not reported	unknown