Abstract
The stibium-doped iso-structural spinel CuIr2−xSbxS4 system has been thoroughly investigated. With the increase of Sb content, the orbitally induced Peierls phase transition is suppressed gradually. The electro-magnetic behavior display that the hysteresis of the phase transition disappears when x>0.15, while the phase transition is entirely suppressed when x>0.2. Raman spectroscopy study shows that phonon vibration modes are changed in the Sb-doped samples although the structure remains unchanged. In addition, the disappearance of the hysteresis and entire suppression of the phase transition correspond to the extinction of F2g(2) and F2g(1) modes, respectively. The experimental results indicate that the change of phonon vibration caused by S–S bonds is the dominant factor to drive the phase transition rather than Ir–S bonds.
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