Field-frequency mapping of the electron spin resonance in the paramagnetic and antiferromagnetic states of LaMnO3

László Mihály, Diyar Talbayev, L. Kiss, Jianshi Zhou, T. Fehér, A. Jánossy

Research output: Contribution to journalArticle

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Abstract

Electron-spin resonance has been studied in a stoichiometric single crystal of LaMnO3 in the temperature range of 4.2 K-250 K. LaMnO 3 exhibits an extensively studied antiferromagnetic (AF) transition at TN = 141 K. The spin resonance was detected both in a fixed-frequency microwave setup with various fixed frequencies (75 GHz, 150 GHz, and 225 GHz) in field-sweep mode or in a broad frequency band instrument at various fixed fields. The latter facility covers the far-infrared range with a lower cutoff frequency of 4 cm (120 GHz). Magnetic fields up to 14 T have been applied along the crystallographic b direction (the easy-axis direction in the AF state). The field dependence of the resonance is fully mapped and the results at low temperatures are well described by the AF resonance theory of Kittel and Keffer modified for the weak ferromagnetism. Deviations from the theory are evident at temperatures close to TN. In the paramagnetic state the spin resonance is broad, and in addition to the expected paramagnetic signal around g = 2, a temperature-dependent anomalous resonance has been also observed.

Original languageEnglish
Article number024414
Pages (from-to)244141-2441412
Number of pages2197272
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number2
Publication statusPublished - Jan 2004

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Paramagnetic resonance
electron paramagnetic resonance
spin resonance
microwave frequencies
ferromagnetism
temperature
cut-off
Temperature
Ferromagnetism
Microwave frequencies
deviation
Cutoff frequency
single crystals
Frequency bands
magnetic fields
Single crystals
Magnetic fields
Infrared radiation
Direction compound

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Field-frequency mapping of the electron spin resonance in the paramagnetic and antiferromagnetic states of LaMnO3. / Mihály, László; Talbayev, Diyar; Kiss, L.; Zhou, Jianshi; Fehér, T.; Jánossy, A.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 69, No. 2, 024414, 01.2004, p. 244141-2441412.

Research output: Contribution to journalArticle

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AU - Zhou, Jianshi

AU - Fehér, T.

AU - Jánossy, A.

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N2 - Electron-spin resonance has been studied in a stoichiometric single crystal of LaMnO3 in the temperature range of 4.2 K-250 K. LaMnO 3 exhibits an extensively studied antiferromagnetic (AF) transition at TN = 141 K. The spin resonance was detected both in a fixed-frequency microwave setup with various fixed frequencies (75 GHz, 150 GHz, and 225 GHz) in field-sweep mode or in a broad frequency band instrument at various fixed fields. The latter facility covers the far-infrared range with a lower cutoff frequency of 4 cm (120 GHz). Magnetic fields up to 14 T have been applied along the crystallographic b direction (the easy-axis direction in the AF state). The field dependence of the resonance is fully mapped and the results at low temperatures are well described by the AF resonance theory of Kittel and Keffer modified for the weak ferromagnetism. Deviations from the theory are evident at temperatures close to TN. In the paramagnetic state the spin resonance is broad, and in addition to the expected paramagnetic signal around g = 2, a temperature-dependent anomalous resonance has been also observed.

AB - Electron-spin resonance has been studied in a stoichiometric single crystal of LaMnO3 in the temperature range of 4.2 K-250 K. LaMnO 3 exhibits an extensively studied antiferromagnetic (AF) transition at TN = 141 K. The spin resonance was detected both in a fixed-frequency microwave setup with various fixed frequencies (75 GHz, 150 GHz, and 225 GHz) in field-sweep mode or in a broad frequency band instrument at various fixed fields. The latter facility covers the far-infrared range with a lower cutoff frequency of 4 cm (120 GHz). Magnetic fields up to 14 T have been applied along the crystallographic b direction (the easy-axis direction in the AF state). The field dependence of the resonance is fully mapped and the results at low temperatures are well described by the AF resonance theory of Kittel and Keffer modified for the weak ferromagnetism. Deviations from the theory are evident at temperatures close to TN. In the paramagnetic state the spin resonance is broad, and in addition to the expected paramagnetic signal around g = 2, a temperature-dependent anomalous resonance has been also observed.

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