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Optical spectroscopy study of charge density wave order in Sr3Rh4Sn13 and (Sr0.5Ca0.5)3Rh4Sn13

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Abstract

We perform optical spectroscopy measurement on single-crystal samples of Sr3Rh4Sn13 and (Sr0.5Ca0.5)3Rh4Sn13. Formation of CDW energy gap was clearly observed for both single-crystal samples when they undergo the phase transitions. The existence of residual Drude components in σ 1(ω) below T CDW indicates that the Fermi surface is only partially gapped in the CDW state. The obtained value of 2Δ/k B T CDW is roughly 13 for both Sr3Rh4Sn13 and (Sr0.5Ca0.5)3Rh4Sn13 compounds, which is considerably larger than the mean-field value based on the weak-coupling BCS theory. The measurements provide optical evidence for the strong coupling characteristics of the CDW phase transition.

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Authors and Affiliations

  1. Institute of Physics, Chinese Academy of Sciences, Bei**g, 100190, China

    W. J. Ban & H. P. Wang

  2. Department of Physics, Cheng Kung University, Tainan, 70101, China

    C. W. Tseng, C. N. Kuo & C. S. Lue

  3. International Center for Quantum Materials, School of Physics, Peking University, Bei**g, 100871, China

    N. L. Wang

  4. Collaborative Innovation Center of Quantum Matter, Bei**g, 100871, China

    N. L. Wang

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  1. W. J. Ban
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  2. H. P. Wang
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  3. C. W. Tseng
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  4. C. N. Kuo
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  5. C. S. Lue
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  6. N. L. Wang
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Correspondence to N. L. Wang.

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Ban, W.J., Wang, H.P., Tseng, C.W. et al. Optical spectroscopy study of charge density wave order in Sr3Rh4Sn13 and (Sr0.5Ca0.5)3Rh4Sn13 . Sci. China Phys. Mech. Astron. 60, 047011 (2017). https://doi.org/10.1007/s11433-017-9007-0

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