Microwave EPR spectroscopy of cobalt-doped germanium cuprate

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

Research output: Contribution to journal › Article

11 Citations (Scopus)

Abstract

Resonance magnetoabsorption spectra of CuGeO 3 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 Cu 2+ chain resonance, a new absorption line (unobserved previously in doped CuGeO 3 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 languageEnglish
Pages (from-to)2238-2248
Number of pages11
JournalPhysics of the Solid State
Volume46
Issue number12
DOIs
Publication statusPublished - Dec 1 2004
Externally publishedYes

Fingerprint

Germanium
Cobalt
cuprates
Paramagnetic resonance
germanium
cobalt
Microwaves
Doping (additives)
Spectroscopy
Magnetic fields
microwaves
spectroscopy
Single crystals
Impurities
Ions
magnetic fields
Temperature
quantitative analysis
frequency ranges
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Demishev, S. V., Semeno, A. V., Sluchanko, N. E., Samarin, N. A., Pronin, A. A., Inagaki, Y., ... Leonyuk, L. I. (2004). Microwave EPR spectroscopy of cobalt-doped germanium cuprate. Physics of the Solid State, 46(12), 2238-2248. https://doi.org/10.1134/1.1841388

Microwave EPR spectroscopy of cobalt-doped germanium cuprate. / Demishev, S. V.; Semeno, A. V.; Sluchanko, N. E.; Samarin, N. A.; Pronin, A. A.; Inagaki, Yuji; Okubo, S.; Ohta, H.; Oshima, Y.; Leonyuk, L. I.

In: Physics of the Solid State, Vol. 46, No. 12, 01.12.2004, p. 2238-2248.

Research output: Contribution to journal › Article

Demishev, SV, Semeno, AV, Sluchanko, NE, Samarin, NA, Pronin, AA, Inagaki, Y, Okubo, S, Ohta, H, Oshima, Y & Leonyuk, LI 2004, 'Microwave EPR spectroscopy of cobalt-doped germanium cuprate', Physics of the Solid State, vol. 46, no. 12, pp. 2238-2248. https://doi.org/10.1134/1.1841388
Demishev SV, Semeno AV, Sluchanko NE, Samarin NA, Pronin AA, Inagaki Y et al. Microwave EPR spectroscopy of cobalt-doped germanium cuprate. Physics of the Solid State. 2004 Dec 1;46(12):2238-2248. https://doi.org/10.1134/1.1841388
Demishev, S. V. ; Semeno, A. V. ; Sluchanko, N. E. ; Samarin, N. A. ; Pronin, A. A. ; Inagaki, Yuji ; Okubo, S. ; Ohta, H. ; Oshima, Y. ; Leonyuk, L. I. / Microwave EPR spectroscopy of cobalt-doped germanium cuprate. In: Physics of the Solid State. 2004 ; Vol. 46, No. 12. pp. 2238-2248.
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AU - Pronin, A. A.

AU - Inagaki, Yuji

AU - Okubo, S.

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AU - Leonyuk, L. I.

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N2 - Resonance magnetoabsorption spectra of CuGeO 3 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 Cu 2+ chain resonance, a new absorption line (unobserved previously in doped CuGeO 3 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 CuGeO 3 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 Cu 2+ chain resonance, a new absorption line (unobserved previously in doped CuGeO 3 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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