Microwave EPR spectroscopy of cobalt-doped germanium cuprate

S. V. Demishev; A. V. Semeno; N. E. Sluchanko; N. A. Samarin; A. A. Pronin; Y. Inagaki; S. Okubo; H. Ohta; Y. Oshima; L. I. Leonyuk

doi:10.1134/1.1841388

Microwave EPR spectroscopy of cobalt-doped germanium cuprate

S. V. Demishev, A. V. Semeno, N. E. Sluchanko, N. A. Samarin, A. A. Pronin, Y. Inagaki, S. Okubo, H. Ohta, Y. Oshima, L. I. Leonyuk

Applied Physics

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	2238-2248
Number of pages	11
Journal	Physics of the Solid State
Volume	46
Issue number	12
DOIs	https://doi.org/10.1134/1.1841388
Publication status	Published - 2004

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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@article{473d5ed6fdcd451abb576a0fedec4fb0,

title = "Microwave EPR spectroscopy of cobalt-doped germanium cuprate",

abstract = "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 N{\'e}el temperature lowered by disorder.",

author = "Demishev, {S. V.} and Semeno, {A. V.} and Sluchanko, {N. E.} and Samarin, {N. A.} and Pronin, {A. A.} and Y. Inagaki and S. Okubo and H. Ohta and Y. Oshima and Leonyuk, {L. I.}",

note = "Funding Information: ACKNOWLEDGMENTS This study was supported by the Russian Foundation for Basic Research (project no. 04-02-16574), INTAS (grant no. 03-51-3036), the Ministry of Education of the Russian Federation (project no. PD02-1.2-335 and the program “Integration”), and the programs of the Russian Academy of Sciences “Low-Dimensional Quantum Structures” and “Strongly Correlated Electrons in Semiconductors, Metals, Superconductors, and Magnetic Materials.” One of the authors (S.V.D.) is grateful to the Russian Science Support Foundation for the financial support and to the Venture Business Laboratory (Kobe University).",

year = "2004",

doi = "10.1134/1.1841388",

language = "English",

volume = "46",

pages = "2238--2248",

journal = "Physics of the Solid State",

issn = "1063-7834",

publisher = "Maik Nauka-Interperiodica Publishing",

number = "12",

}

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.

N1 - Funding Information: ACKNOWLEDGMENTS This study was supported by the Russian Foundation for Basic Research (project no. 04-02-16574), INTAS (grant no. 03-51-3036), the Ministry of Education of the Russian Federation (project no. PD02-1.2-335 and the program “Integration”), and the programs of the Russian Academy of Sciences “Low-Dimensional Quantum Structures” and “Strongly Correlated Electrons in Semiconductors, Metals, Superconductors, and Magnetic Materials.” One of the authors (S.V.D.) is grateful to the Russian Science Support Foundation for the financial support and to the Venture Business Laboratory (Kobe University).

PY - 2004

Y1 - 2004

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.

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