High-field ESR studies of the quantum spin dimer system Ba 3Cr2O8

D. Kamenskyi; J. Wosnitza; J. Krzystek; A. A. Aczel; H. A. Dabkowska; A. B. Dabkowski; G. M. Luke; S. A. Zvyagin

doi:10.1007/s10909-012-0722-4

High-field ESR studies of the quantum spin dimer system Ba ₃Cr₂O₈

D. Kamenskyi
, J. Wosnitza
, J. Krzystek
, A. A. Aczel
, H. A. Dabkowska
, A. B. Dabkowski
, G. M. Luke
, S. A. Zvyagin

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

9 Scopus citations

Abstract

Results of systematic high-frequency electron spin resonance (ESR) studies of Ba₃Cr₂O₈, a weakly coupled S1/2 dimer system, in magnetic fields up to 25 T are reported. Two pairs of ESR gapped modes corresponding to transitions from a spin-singlet ground state to the first excited triplet states with gaps, Δ _AB =563 GHz and Δ _CD =399 GHz, are revealed below H _c1=12.5 T. The detection of the ground-state excitations by means of ESR clearly indicates the presence of a non-secular term allowing these transitions. A complex structure of the microwave absorption spectrum in magnetic fields above H _c1 is observed, those peculiarities are discussed.

Original language	English
Pages (from-to)	231-235
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	170
Issue number	5-6
DOIs	https://doi.org/10.1007/s10909-012-0722-4
State	Published - Mar 2013

Funding

Acknowledgements We thank O. Cepas and J. Deisenhofer for helpful discussions. This work has partly been supported by the DFG and EuroMagNET II (EU contract No. 228043). A portion of this work was performed at the National High Magnetic Field Laboratory, Tallahassee, FL, which is supported by NSF Cooperative Agreement No. DMR-0654118, by the State of Florida, and by the DOE.

Keywords

Dimers
Electron spin resonance
Field-induced phase transition

Access to Document

10.1007/s10909-012-0722-4

Cite this

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title = "High-field ESR studies of the quantum spin dimer system Ba 3Cr2O8",

abstract = "Results of systematic high-frequency electron spin resonance (ESR) studies of Ba3Cr2O8, a weakly coupled S1/2 dimer system, in magnetic fields up to 25 T are reported. Two pairs of ESR gapped modes corresponding to transitions from a spin-singlet ground state to the first excited triplet states with gaps, Δ AB =563 GHz and Δ CD =399 GHz, are revealed below H c1=12.5 T. The detection of the ground-state excitations by means of ESR clearly indicates the presence of a non-secular term allowing these transitions. A complex structure of the microwave absorption spectrum in magnetic fields above H c1 is observed, those peculiarities are discussed.",

keywords = "Dimers, Electron spin resonance, Field-induced phase transition",

author = "D. Kamenskyi and J. Wosnitza and J. Krzystek and Aczel, \{A. A.\} and Dabkowska, \{H. A.\} and Dabkowski, \{A. B.\} and Luke, \{G. M.\} and Zvyagin, \{S. A.\}",

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T1 - High-field ESR studies of the quantum spin dimer system Ba 3Cr2O8

AU - Kamenskyi, D.

AU - Wosnitza, J.

AU - Krzystek, J.

AU - Aczel, A. A.

AU - Dabkowska, H. A.

AU - Dabkowski, A. B.

AU - Luke, G. M.

AU - Zvyagin, S. A.

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AB - Results of systematic high-frequency electron spin resonance (ESR) studies of Ba3Cr2O8, a weakly coupled S1/2 dimer system, in magnetic fields up to 25 T are reported. Two pairs of ESR gapped modes corresponding to transitions from a spin-singlet ground state to the first excited triplet states with gaps, Δ AB =563 GHz and Δ CD =399 GHz, are revealed below H c1=12.5 T. The detection of the ground-state excitations by means of ESR clearly indicates the presence of a non-secular term allowing these transitions. A complex structure of the microwave absorption spectrum in magnetic fields above H c1 is observed, those peculiarities are discussed.

KW - Dimers

KW - Electron spin resonance

KW - Field-induced phase transition

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