Partial gap opening on the Fermi surface of the noncentrosymmetric superconductor Mo3Al2C
T. Koyama, Y. Ozaki, K. Ueda, T. Mito, T. Kohara, T. Waki, Y. Tabata, C. Michioka, K. Yoshimura, M.-T. Suzuki, H. Nakamura
DOI 10.1103/PhysRevB.84.212501 · Physical Review B
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Abstract
We report the results of 27Al nuclear magnetic resonance and specific-heat measurements of the noncentrosymmetric superconductor Mo3Al2C in the normal state. The phase transition at ∼130 K is inferred from a distinct change in the NMR spectrum, a clear peak in the spin-echo decay rate, and an anomaly in the specific heat. At ∼130 K, the Knight shift and the spin-lattice relaxation rate 1/T1 exhibit a significant decrease, which is associated with a reduction in the conduction electron density. These results suggest most probably charge-density wave ordering at ∼130 K. Furthermore, the decrease in 1/T1 below the superconducting transition temperature suggests that superconductivity emerges on the partially quenched Fermi surface.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Mo3Al2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | unknown |
| Mo3Al2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.2 | Pressure not reported | onset |
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