High-Field ESR Measurements of the Spin-Gap System in Polarized Microwaves

S. Kimura; K. Watanabe; T. Kashiwagi; H. Yamaguchi; M. Hagiwara; Z. Honda

doi:10.1007/s00723-015-0661-8

High-Field ESR Measurements of the Spin-Gap System in Polarized Microwaves

S. Kimura, K. Watanabe, T. Kashiwagi, H. Yamaguchi, M. Hagiwara, Z. Honda

High Field Laboratory for Superconducting Materials

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

Abstract

We have performed high-field electron spin resonance (ESR) measurements of the isolated antiferromagnetic dimer system Na₂Co₂(C₂O₄)₃(H₂O)₂ by illuminating circularly polarized microwaves at 162 GHz. Different from a usual ESR signal by the magnetic dipole transition, the resonance signal, coming from the direct transition between the singlet and triplet states in this compound, is suggested to show absence of circular dichroism. From this curious behavior, we consider that the direct transition in Na₂Co₂(C₂O₄)₃(H₂O)₂ is driven by oscillating electric fields of microwaves. We propose that the spin current mechanism is responsible to induce a finite probability for the electric-dipole-active transition between the singlet and the triplet states in Na₂Co₂(C₂O₄)₃(H₂O)₂.

Original language	English
Pages (from-to)	1035-1039
Number of pages	5
Journal	Applied Magnetic Resonance
Volume	46
Issue number	9
DOIs	https://doi.org/10.1007/s00723-015-0661-8
Publication status	Published - 2015 Oct 1

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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title = "High-Field ESR Measurements of the Spin-Gap System in Polarized Microwaves",

abstract = "We have performed high-field electron spin resonance (ESR) measurements of the isolated antiferromagnetic dimer system Na2Co2(C2O4)3(H2O)2 by illuminating circularly polarized microwaves at 162 GHz. Different from a usual ESR signal by the magnetic dipole transition, the resonance signal, coming from the direct transition between the singlet and triplet states in this compound, is suggested to show absence of circular dichroism. From this curious behavior, we consider that the direct transition in Na2Co2(C2O4)3(H2O)2 is driven by oscillating electric fields of microwaves. We propose that the spin current mechanism is responsible to induce a finite probability for the electric-dipole-active transition between the singlet and the triplet states in Na2Co2(C2O4)3(H2O)2.",

author = "S. Kimura and K. Watanabe and T. Kashiwagi and H. Yamaguchi and M. Hagiwara and Z. Honda",

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T1 - High-Field ESR Measurements of the Spin-Gap System in Polarized Microwaves

AU - Kimura, S.

AU - Watanabe, K.

AU - Kashiwagi, T.

AU - Yamaguchi, H.

AU - Hagiwara, M.

AU - Honda, Z.

PY - 2015/10/1

Y1 - 2015/10/1

N2 - We have performed high-field electron spin resonance (ESR) measurements of the isolated antiferromagnetic dimer system Na2Co2(C2O4)3(H2O)2 by illuminating circularly polarized microwaves at 162 GHz. Different from a usual ESR signal by the magnetic dipole transition, the resonance signal, coming from the direct transition between the singlet and triplet states in this compound, is suggested to show absence of circular dichroism. From this curious behavior, we consider that the direct transition in Na2Co2(C2O4)3(H2O)2 is driven by oscillating electric fields of microwaves. We propose that the spin current mechanism is responsible to induce a finite probability for the electric-dipole-active transition between the singlet and the triplet states in Na2Co2(C2O4)3(H2O)2.

AB - We have performed high-field electron spin resonance (ESR) measurements of the isolated antiferromagnetic dimer system Na2Co2(C2O4)3(H2O)2 by illuminating circularly polarized microwaves at 162 GHz. Different from a usual ESR signal by the magnetic dipole transition, the resonance signal, coming from the direct transition between the singlet and triplet states in this compound, is suggested to show absence of circular dichroism. From this curious behavior, we consider that the direct transition in Na2Co2(C2O4)3(H2O)2 is driven by oscillating electric fields of microwaves. We propose that the spin current mechanism is responsible to induce a finite probability for the electric-dipole-active transition between the singlet and the triplet states in Na2Co2(C2O4)3(H2O)2.

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