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Magnetic frustration in iridium spinel compound CuIr$_2$S$_4$

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arxiv 1402.1250 v1 pith:FWRS5NBA submitted 2014-02-06 cond-mat.str-el

K. M. Kojima , 2 R. Kadono , M. Miyazaki , M. Hiraishi , I. Yamauchi , A. Koda , Y. Tsuchiya , H. S. Suzuki
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H. Kitazawa
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classification cond-mat.str-el
keywords statebelowcompoundcuirfrustrationgroundiridiummagnetic
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abstract

We demonstrate via a muon spin rotation experiment that the electronic ground state of the iridium spinel compound, CuIr$_2$S$_4$, is not the presumed spin-singlet state but a novel paramagnetic state, showing a quasistatic spin glass-like magnetism below ~100 K. Considering the earlier indication that IrS$_6$ octahedra exhibit dimerization associated with the metal-to-insulator transition below 230 K, the present result suggests that a strong spin-orbit interaction may be playing an important role in determining the ground state that accompanies magnetic frustration.

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