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

We perform optical spectroscopy measurement 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 residual Drude components in σ 1 ( ω...

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Bibliographic Details
Published in:Science China. Physics, mechanics & astronomy mechanics & astronomy, 2017-04, Vol.60 (4), p.047011, Article 047011
Main Authors: Ban, W. J., Wang, H. P., Tseng, C. W., Kuo, C. N., Lue, C. S., Wang, N. L.
Format: Article
Language:English
Subjects:
Aluminum
Astronomy
Bans
BCS theory
Charge density waves
Classical and Continuum Physics
Coupling
Energy
Energy gap
Fermi surfaces
Gold
Intermetallic compounds
Observations and Techniques
Phase transitions
Physics
Physics and Astronomy
Single crystals
Spectroscopy
Spectrum analysis
Temperature
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Summary:We perform optical spectroscopy measurement 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 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 Sr 3 Rh 4 Sn 13 and (Sr 0.5 Ca 0.5 ) 3 Rh 4 Sn 13 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.
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-017-9007-0