Optical spectroscopy study of charge density wave order in Sr${}_3$Rh${}_4$Sn${}_{13}$ and (Sr${}_{0.5}$Ca${}_{0.5}$)${}_3$Rh${}_4$Sn${}_{13}$

Abstract

We perform optical spectroscopy measurement across the charge density wave (CDW) phase transitions on single-crystal samples of Sr${}_3$Rh${}_4$Sn${}_{13}$ and (Sr${}_{0.5}$Ca${}_{0.5}$)${}_3$Rh${}_4$Sn${}_{13}$. Formation of CDW energy gap was clearly observed for both single-crystal samples when they undergo the phase transitions. The existence of a Drude component in ${\sigma }_1(\omega )$ below \TCDW indicates that the Fermi surface is only partially gapped in the CDW state. The obtained value of 2$\Delta$/K${}_B$T${}_{CDW}$ is roughly 13 for both Sr${}_3$Rh${}_4$Sn${}_{13}$ and (Sr${}_{0.5}$Ca${}_{0.5}$)${}_3$Rh${}_4$Sn${}_{13}$ compounds. The value is considerably larger than the mean-field value based on the weak-coupling BCS theory. The observed spectral feature in (Sr${}_x$Ca${}_{1-x}$)${}_3$Rh${}_4$Sn${}_{13}$ resembles those seen in many other CDW systems.

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Cited by in corpus (4)

• Intriguing Low-Temperature Phase in the Antiferromagnetic Kagome Metal FeGe
• Order-Disorder Transitions in (Ca${}_x$Sr${}_{1-x}$)${}_3$Rh${}_4$Sn${}_{13}$
• The effective increase in atomic scale disorder by doping and superconductivity in Ca${}_3$Rh${}_4$Sn${}_{13}$
• Diffuse Scattering from Correlated Electron Systems