High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCu$_3$V$_2$O$_8$(OH)$_2$

High-field electron spin resonance (ESR) measurements have been performed on vesignieite BaCu $_{3}$ V $_{2}$ O $_{8}$ (OH) $_{2}$ , which is considered as a nearly ideal model substance of $S$ =1/2 kagome antiferromagnet, in the temperature region from 1.9 to 265 K. The frequency region is from 60 to 360 GHz and the applied pulsed magnetic field is up to 16 T. Observed g-value and linewidth show the increase below 20 K, which suggest the development of the short range order. Moreover, a gapless spin liquid ground state is suggested from the frequency-field relation at 1.9 K.

High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCu $_{3}$ V $_{2}$ O $_{8}$ (OH) $_{2}$

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High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCu $_{3}$ V $_{2}$ O $_{8}$ (OH) $_{2}$

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High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCu33​V22​O88​(OH)22​

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High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCu33​V22​O88​(OH)22​

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High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCu $_{3}$ V $_{2}$ O $_{8}$ (OH) $_{2}$

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High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCu $_{3}$ V $_{2}$ O $_{8}$ (OH) $_{2}$

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