Charge fluctuation in Sm3Te4

Y. Nemoto; T. Goto; A. Ochiai; T. Suzuki

doi:10.1016/S0921-4526(99)01130-8

Charge fluctuation in Sm₃Te₄

Y. Nemoto, T. Goto, A. Ochiai, T. Suzuki

Research output: Contribution to journal › Conference article › peer-review

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/k_B 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
Pages (from-to)	136-138
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	281-282
DOIs	https://doi.org/10.1016/S0921-4526(99)01130-8
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

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10.1016/S0921-4526(99)01130-8

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@article{61b536dde78f45a48b86be92b124f2f9,

title = "Charge fluctuation in Sm3Te4",

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.",

author = "Y. Nemoto and T. Goto and A. Ochiai and T. Suzuki",

year = "2000",

month = jun,

day = "1",

doi = "10.1016/S0921-4526(99)01130-8",

language = "English",

volume = "281-282",

pages = "136--138",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

note = "Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) ; Conference date: 24-08-1999 Through 28-08-1999",

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TY - JOUR

T1 - Charge fluctuation in Sm3Te4

AU - Nemoto, Y.

AU - Goto, T.

AU - Ochiai, A.

AU - Suzuki, T.

PY - 2000/6/1

Y1 - 2000/6/1

N2 - 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.

AB - 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.

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DO - 10.1016/S0921-4526(99)01130-8

M3 - Conference article

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SP - 136

EP - 138

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

T2 - Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99)

Y2 - 24 August 1999 through 28 August 1999

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