Electron spin resonance measurements at ultralow temperatures

Takuo Sakon, Keiichi Koyama, Mitsuhiro Motokawa, Hiroyuki Nojiri, Takayuki Asano, Yoshitami Ajiro

Research output: Contribution to journalArticlepeer-review


An electron spin resonance (ESR) measurement system for use at ultralow temperatures using a 3He-4He dilution refrigerator has been developed down to 160 mK. As the first experiment, the ESR was measured on a quantum spin chain Cu benzoate, in which a field-induced gap was recently found. The evaluation of a new ESR mode, so-called breather mode, was found at the lowest temperatures. In the present work, we observed a smaller gap in H||b by suppressing of the thermal excitation.

Original languageEnglish
Pages (from-to)1629-1631
Number of pages3
JournalPhysica B: Condensed Matter
Issue numberII
Publication statusPublished - 2003 May


  • Cu-benzoate
  • Dilution refrigerator
  • Electron spin resonance
  • Quantum spin chain


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