Abstract
Ultrasonic measurements for a valence-fluctuation compound Sm3Te4 have been performed. Considerable dispersion around 120 K due to a thermal hopping motion of 4f-electron among Sm2+ and Sm3+ has been observed in the ultrasonic attenuation. The relaxation time of the charge fluctuation 2πτ becomes infinite at low temperatures following as τ = τ0exp(E/kB T), here 2πτ0 = 2.5×10-13 s and E = 0.136 eV. The ln T dependence of the elastic constants similar to a two-level system of amorphous glass compounds is observed at low temperatures below 15 K. These results indicate a two-level system of the 4f-electron tunneling in the random potential of Sm2+ and Sm3+ ions due to the charge glass state.
Original language | English |
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Pages (from-to) | 136-138 |
Number of pages | 3 |
Journal | Physica B: Condensed Matter |
Volume | 281-282 |
DOIs | |
Publication status | Published - 2000 Jun 1 |
Externally published | Yes |
Event | Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Jpn Duration: 1999 Aug 24 → 1999 Aug 28 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering