Optical Conductivity Spectral Anomalies in the Off-Center Rattling System β-Ba8Ga16Sn30
Physical review letters Volume 106 Issue 1
Page 015501-1-015501-4
published_at 2011-01-06
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Title ( eng ) |
Optical Conductivity Spectral Anomalies in the Off-Center Rattling System β-Ba8Ga16Sn30
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Creator |
Mori Tatsuya
Iwamoto K.
Kushibiki S.
Honda H.
Matsumoto Hideki
Toyota Naoki
Avila Marcos A.
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Source Title |
Physical review letters
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Volume | 106 |
Issue | 1 |
Start Page | 015501-1 |
End Page | 015501-4 |
Descriptions |
We present optical conductivity studies of the type-I clathrate Ba_8Ga_<16>Sn_<30>, using a terahertz time-domain spectrometer (0.3-3.0 THz). The lowest-lying spectral peak at 0.72 THz due to the Ba(2) ion's off-center vibration in the oversized cage shows a drastic and anomalous temperature dependence. Below about 100 K, the single broad peak splits into two subpeaks, and with further lowering of the temperature, the spectral shape of this so-called rattling phonon shows non-Boltzmann broadening to the point that the linewidth becomes comparable to the peak frequency. Whereas the initial splitting can be understood by assuming a multiwell anharmonic potential, the strong linewidth broadening toward low temperature cannot, since the Boltzmann factor generally sharpens the low-temperature spectra. The observed behavior suggests strong interaction between the local anharmonic phonons and other excitations.
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NDC |
Physics [ 420 ]
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Language |
eng
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Resource Type | journal article |
Publisher |
The American Physical Society
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Date of Issued | 2011-01-06 |
Rights |
Copyright (c) 2011 The American Physical Society
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Publish Type | Version of Record |
Access Rights | open access |
Source Identifier |
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.106.015501
[NCID] AA00773679
[DOI] http://dx.doi.org/10.1103/PhysRevLett.106.015501
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