Magnetic excitations in the 1/3 plateau state in InCu3(OH)6Cl3
Abstract
Magnetic dynamics in InCu3(OH)6Cl3 was investigated from the NMR relaxation rate measurement. In InCu3(OH)6Cl3, the magnetization isotherm shows a plateau at the 1/3 of full-saturation magnetization, characterizing the 1/3 plateau state. As the 1/3 plateau state appears above 7 T upto 14 T, the microscopic magnetic properties were investigated with the NMR measurement in steady fields. The temperature and field dependence of 1/T1 measurement reveals a gap in the magnetic excitation spectrum and its evolution with field in the 1/3 plateau state. The field dependence of spin gap provides an important information to understand the microscopic origin of 1/3 plateau state in the kagome antiferromagnets.
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