Phonon anomalies within the polar charge density wave phase of the structurally chiral superconductor Mo3Al2C

Shangfei Wu; Xianghan Xu; Fei-Ting Huang; Turan Birol; Sang-Wook Cheong; Girsh Blumberg

doi:10.1103/nkx2-6qyr

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Phonon anomalies within the polar charge density wave phase of the structurally chiral superconductor Mo3Al2C

Shangfei Wu, Xianghan Xu, Fei-Ting Huang, Turan Birol, Sang-Wook Cheong, Girsh Blumberg

DOI 10.1103/nkx2-6qyr · Physical Review B

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Abstract

We employ polarization-resolved Raman spectroscopy to study the lattice dynamics of the polar charge density wave phase of the superconductor Mo3Al2C with structural chirality. We show the phononic signatures of the charge density wave transition at T* = 155 K in Mo3Al2C. The detailed temperature dependence of these phonon modes' frequency, half width at half maximum, and integrated area below T* reveal anomalies at an intermediate temperature T′∼ 100 K, especially for the low-energy modes at 130 and 180 cm−1. We discuss the origin of these phonon anomalies within the polar charge density wave phase of Mo3Al2C.

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.	8	Pressure not reported	unknown