Electron Spin Resonance Study of Cu Benzoate Using a<sup>3</sup>He–<sup>4</sup>He Dilution Refrigerator

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  • Sakon Takuo
    Institute for Materials Research, Tohoku University, Sendai 980-8577
  • Nojiri Hiroyuki
    Institute for Materials Research, Tohoku University, Sendai 980-8577
  • Koyama Keiichi
    Institute for Materials Research, Tohoku University, Sendai 980-8577
  • Asano Takayuki
    Physics Department, Graduated School of Science, Kyushu University, Fukuoka 812-8581
  • Ajiro Yoshitami
    Physics Department, Graduated School of Science, Kyushu University, Fukuoka 812-8581
  • Motokawa Mitsuhiro
    High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai 980-8577

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  • Electron Spin Resonance Study of Cu Benzoate Using a 3He-4He Dilution Refrigerator.

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An electron spin resonance (ESR) measurement system for use at ultralow temperatures using a 3He-4He dilution refrigerator has been developed. As the first experiment, the ESR was measured on a quantum spin chain Cu benzoate down to 160 mK, in which a field-induced gap was recently found. 4) The evaluation of a new ESR mode, the so-called breather mode, was found at the lowest temperatures. In the previous ESR down to 0.5 K, this mode was clearly found for H || c, in which the magnitude of the gap is largest. In the present work, the achievement of low temperatures enabled us to observe a smaller gap in H || b by suppressing the thermal excitation. The magnitude of the field-induced gap evaluated from the nonlinear field dependence of the mode shows good agreement with that determined by previous specific heat measurements.

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