Observation of a Spin Gap in the Normal State of Superconducting Mo3Sb7

Vinh Hung Tran; Wojciech Miiller; Zbigniew Bukowski

doi:10.1103/PhysRevLett.100.137004

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Observation of a Spin Gap in the Normal State of Superconducting Mo3Sb7

Vinh Hung Tran, Wojciech Miiller, Zbigniew Bukowski

DOI 10.1103/PhysRevLett.100.137004 · Physical Review Letters

T1

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Abstract

Magnetization, specific heat, and electrical resistivity measurements have been performed on the superconductor Mo3Sb7. Two kinds of transitions are observed at 2.3 and 50 K, respectively. The former is superconducting transition, while the latter is attributed to spin-gap formation. From the analysis of the experimental data, excitation gap, intra- and interdimer interactions are estimated as Δ/kb∼120 K, J0/kB∼150 K, and J1/kB∼55 K. The electronic structure calculations using the LSDA approximation show nesting property in the Fermi surface, favoring the superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Mo3Sb7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure not reported	onset
Mo3Sb7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure not reported	onset
Mo3Sb7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure not reported	onset
Mo3Sb7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.08	Pressure not reported	unknown