Phonon anomalies within the polar charge density wave phase of the structurally chiral superconductor <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">Mo</mi><mn>3</mn></msub><msub><mi mathvariant="normal">Al</mi><mn>2</mn></msub><mi mathvariant="normal">C</mi></math>

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

doi:10.1103/nkx2-6qyr

Phonon anomalies within the polar charge density wave phase of the structurally chiral superconductor ${Mo}_{3} {Al}_{2} C$

Shangfei Wu ^1,2,*, Xianghan Xu ^1,3,4, Fei-Ting Huang ^1,3, Turan Birol ⁵, Sang-Wook Cheong ^1,3, and Girsh Blumberg ^1,6,†

¹Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
²Beijing Academy of Quantum Information Sciences, Beijing 100193, China
³Keck Center for Quantum Magnetism, Rutgers University, Piscataway, New Jersey 08854, USA
⁴School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
⁵Department of Chemical Engineering and Materials Science, University of Minnesota, Minnesota 55455, USA
⁶National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia

^*Contact author: wusf@baqis.ac.cn
^†Contact author: girsh@physics.rutgers.edu

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Phys. Rev. B 111, 224505 – Published 10 June, 2025

DOI: https://doi.org/10.1103/nkx2-6qyr

Abstract

We employ polarization-resolved Raman spectroscopy to study the lattice dynamics of the polar charge density wave phase of the superconductor ${Mo}_{3} {Al}_{2} C$ with structural chirality. We show the phononic signatures of the charge density wave transition at $T^{*}$ = 155 K in ${Mo}_{3} {Al}_{2} C$ . 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 $T^{'} \sim$ 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 ${Mo}_{3} {Al}_{2} C$ .

Physical Review B

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Phonon anomalies within the polar charge density wave phase of the structurally chiral superconductor ${Mo}_{3} {Al}_{2} C$

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

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Phonon anomalies within the polar charge density wave phase of the structurally chiral superconductor ${Mo}_{3} {Al}_{2} C$