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Abstract
An electron spin resonance (ESR) measurement system for use at ultralow temperatures using a 3 He– 4 He 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.
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