Raman scattering study of Cu(Ge1-xSix)O3

Norio Ogita; Yasuhiro Tsunezumi; Jun Akimitsu; Masayuki Udagawa

doi:10.1016/S0921-4526(98)01296-4

Raman scattering study of Cu(Ge_1-xSi_x)O₃

Norio Ogita, Yasuhiro Tsunezumi, Jun Akimitsu, Masayuki Udagawa

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

Abstract

Temperature and magnetic field dependence of Raman scattering spectra of Cu(Ge_1-xSi_x)O₃ has been measured for x = 0, 0.005, 0.008, 0.01, 0.015 and 0.02. For x≠0, zone-folded phonons due to the unit cell doubling appear at higher temperature (T_l) than the spin-Peierls transition temperature (T_SP) and T_l increases with an increase of x. The coupling between magnetic fluctuation and phonon is estimated from the peak at about 100 cm^-1 using the Fano formula, and the obtained coupling is almost independent of x. These results show that the suppression of T_SP by Si-doping is mainly caused by the dimensional change of the magnetic interactions from one to three dimensions. The magnetic field dependence clarifies that the peak at 30 cm^-1 is the soft phonon mode, not the SP gap excitation.

Original language	English
Pages (from-to)	832-834
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	263-264
DOIs	https://doi.org/10.1016/S0921-4526(98)01296-4
Publication status	Published - Mar 1999
Externally published	Yes
Event	Proceedings of the 1998 9th International Conference on Phonon Scattering in Condensed Matter, PHONONS 98 - Lancaster, Great Britain Duration: Jul 26 1998 → Jul 31 1998

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Raman scattering study of Cu(Ge1-xSix)O3",

abstract = "Temperature and magnetic field dependence of Raman scattering spectra of Cu(Ge1-xSix)O3 has been measured for x = 0, 0.005, 0.008, 0.01, 0.015 and 0.02. For x≠0, zone-folded phonons due to the unit cell doubling appear at higher temperature (Tl) than the spin-Peierls transition temperature (TSP) and Tl increases with an increase of x. The coupling between magnetic fluctuation and phonon is estimated from the peak at about 100 cm-1 using the Fano formula, and the obtained coupling is almost independent of x. These results show that the suppression of TSP by Si-doping is mainly caused by the dimensional change of the magnetic interactions from one to three dimensions. The magnetic field dependence clarifies that the peak at 30 cm-1 is the soft phonon mode, not the SP gap excitation.",

author = "Norio Ogita and Yasuhiro Tsunezumi and Jun Akimitsu and Masayuki Udagawa",

year = "1999",

month = mar,

doi = "10.1016/S0921-4526(98)01296-4",

language = "English",

volume = "263-264",

pages = "832--834",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

note = "Proceedings of the 1998 9th International Conference on Phonon Scattering in Condensed Matter, PHONONS 98 ; Conference date: 26-07-1998 Through 31-07-1998",

}

TY - JOUR

T1 - Raman scattering study of Cu(Ge1-xSix)O3

AU - Ogita, Norio

AU - Tsunezumi, Yasuhiro

AU - Akimitsu, Jun

AU - Udagawa, Masayuki

PY - 1999/3

Y1 - 1999/3

N2 - Temperature and magnetic field dependence of Raman scattering spectra of Cu(Ge1-xSix)O3 has been measured for x = 0, 0.005, 0.008, 0.01, 0.015 and 0.02. For x≠0, zone-folded phonons due to the unit cell doubling appear at higher temperature (Tl) than the spin-Peierls transition temperature (TSP) and Tl increases with an increase of x. The coupling between magnetic fluctuation and phonon is estimated from the peak at about 100 cm-1 using the Fano formula, and the obtained coupling is almost independent of x. These results show that the suppression of TSP by Si-doping is mainly caused by the dimensional change of the magnetic interactions from one to three dimensions. The magnetic field dependence clarifies that the peak at 30 cm-1 is the soft phonon mode, not the SP gap excitation.

AB - Temperature and magnetic field dependence of Raman scattering spectra of Cu(Ge1-xSix)O3 has been measured for x = 0, 0.005, 0.008, 0.01, 0.015 and 0.02. For x≠0, zone-folded phonons due to the unit cell doubling appear at higher temperature (Tl) than the spin-Peierls transition temperature (TSP) and Tl increases with an increase of x. The coupling between magnetic fluctuation and phonon is estimated from the peak at about 100 cm-1 using the Fano formula, and the obtained coupling is almost independent of x. These results show that the suppression of TSP by Si-doping is mainly caused by the dimensional change of the magnetic interactions from one to three dimensions. The magnetic field dependence clarifies that the peak at 30 cm-1 is the soft phonon mode, not the SP gap excitation.

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DO - 10.1016/S0921-4526(98)01296-4

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VL - 263-264

SP - 832

EP - 834

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

T2 - Proceedings of the 1998 9th International Conference on Phonon Scattering in Condensed Matter, PHONONS 98

Y2 - 26 July 1998 through 31 July 1998

ER -