S=1/2 Kagome晶格反铁磁体BaCu $_3$ V $_2$ O PDMATHAAE(OH)$_2$的高场ESR测量
High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCu$_3$V$_2$O$_8$(OH)$_2$
摘要:
在1.9 ~ 265 K温度范围内,对被认为是$S$ =1/2 kagome反铁磁体的近理想模型物质的钒铜钡矿BaCu $_3$ V $_2$ O $_8$(OH)$_2$进行了高场电子自旋共振(ESR)测量.频率范围为60 ~ 360 GHz,外加脉冲磁场高达16 T。观察到的g值和线宽的增加低于20 K,这表明短程有序的发展。此外,根据频率-场关系,提出了1.9K下无带隙自旋液体基态。
英文摘要:
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.
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