抄録
Resonance magnetoabsorption spectra of CuGeO3 single crystals containing 2% Co impurity have been studied in the frequency range 60-360 GHz in magnetic fields of up to 16 T and in the temperature interval 2-60 K with the magnetic field B aligned parallel to the a crystallographic axis. In addition to the Cu2+ chain resonance, a new absorption line (unobserved previously in doped CuGeO3 and deriving apparently from the Co 2+ ions) was detected in EPR spectra. Quantitative analysis of the spectra suggests that the spin-Peierls transition occurs in about 10% Cu 2+ chains, while the spin-Peierls state in the remaining 90% chains is completely destroyed by cobalt doping. The results obtained reveal considerable deviations from the universally accepted scenario of CuGeO 3 doping and are discussed within alternative theoretical models, namely, the quantum critical behavior (based on the EPR theory for quasi-one-dimensional systems) and a three-dimensional antiferromagnet with the Néel temperature lowered by disorder.
元の言語 | 英語 |
---|---|
ページ(範囲) | 2238-2248 |
ページ数 | 11 |
ジャーナル | Physics of the Solid State |
巻 | 46 |
発行部数 | 12 |
DOI | |
出版物ステータス | 出版済み - 12 1 2004 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
これを引用
Microwave EPR spectroscopy of cobalt-doped germanium cuprate. / Demishev, S. V.; Semeno, A. V.; Sluchanko, N. E.; Samarin, N. A.; Pronin, A. A.; Inagaki, Y.; Okubo, S.; Ohta, H.; Oshima, Y.; Leonyuk, L. I.
:: Physics of the Solid State, 巻 46, 番号 12, 01.12.2004, p. 2238-2248.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - Microwave EPR spectroscopy of cobalt-doped germanium cuprate
AU - Demishev, S. V.
AU - Semeno, A. V.
AU - Sluchanko, N. E.
AU - Samarin, N. A.
AU - Pronin, A. A.
AU - Inagaki, Y.
AU - Okubo, S.
AU - Ohta, H.
AU - Oshima, Y.
AU - Leonyuk, L. I.
PY - 2004/12/1
Y1 - 2004/12/1
N2 - Resonance magnetoabsorption spectra of CuGeO3 single crystals containing 2% Co impurity have been studied in the frequency range 60-360 GHz in magnetic fields of up to 16 T and in the temperature interval 2-60 K with the magnetic field B aligned parallel to the a crystallographic axis. In addition to the Cu2+ chain resonance, a new absorption line (unobserved previously in doped CuGeO3 and deriving apparently from the Co 2+ ions) was detected in EPR spectra. Quantitative analysis of the spectra suggests that the spin-Peierls transition occurs in about 10% Cu 2+ chains, while the spin-Peierls state in the remaining 90% chains is completely destroyed by cobalt doping. The results obtained reveal considerable deviations from the universally accepted scenario of CuGeO 3 doping and are discussed within alternative theoretical models, namely, the quantum critical behavior (based on the EPR theory for quasi-one-dimensional systems) and a three-dimensional antiferromagnet with the Néel temperature lowered by disorder.
AB - Resonance magnetoabsorption spectra of CuGeO3 single crystals containing 2% Co impurity have been studied in the frequency range 60-360 GHz in magnetic fields of up to 16 T and in the temperature interval 2-60 K with the magnetic field B aligned parallel to the a crystallographic axis. In addition to the Cu2+ chain resonance, a new absorption line (unobserved previously in doped CuGeO3 and deriving apparently from the Co 2+ ions) was detected in EPR spectra. Quantitative analysis of the spectra suggests that the spin-Peierls transition occurs in about 10% Cu 2+ chains, while the spin-Peierls state in the remaining 90% chains is completely destroyed by cobalt doping. The results obtained reveal considerable deviations from the universally accepted scenario of CuGeO 3 doping and are discussed within alternative theoretical models, namely, the quantum critical behavior (based on the EPR theory for quasi-one-dimensional systems) and a three-dimensional antiferromagnet with the Néel temperature lowered by disorder.
UR - http://www.scopus.com/inward/record.url?scp=20444440243&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=20444440243&partnerID=8YFLogxK
U2 - 10.1134/1.1841388
DO - 10.1134/1.1841388
M3 - Article
AN - SCOPUS:20444440243
VL - 46
SP - 2238
EP - 2248
JO - Physics of the Solid State
JF - Physics of the Solid State
SN - 1063-7834
IS - 12
ER -