Tuesday, May 21, 2013

1305.4356 (Yuesheng Li et al.)

Transition-metal distribution in kagome antiferromagnet CoCu3(OH)6Cl2
revealed by resonant x-ray diffraction

Yuesheng Li, Jianlong Fu, Zhonghua Wu, Qingming Zhang
The distribution of chemically similar transition-metal ions is a fundamental issue in the study of herbertsmithite-type kagome antiferromagnets. Using synchrotron radiation, we have performed resonant powder x-ray diffractions on newly synthesized CoCu3(OH)6Cl2, which provide an exact distribution of transition-metal ions in the frustrated antiferromagnet. Both magnetic susceptibility and specific heat measurements are quantitatively consistent with the occupation fractions determined by resonant x-ray diffraction. The distribution of transition-metal ions and residual magnetic entropy suggest a novel low temperature (T < 4 K) magnetism, where the interlayer triangular spins undergo a spin-glass freezing while the kagome spins still keep highly frustrated.
View original: http://arxiv.org/abs/1305.4356

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