Raman scattering study of the phase sequence in A2BX4 halides |
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Authors: | OP Lamba MB Patel S Ram Prem Chand HD Bist |
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Institution: | Department of Physics, Indian Institute of Technology, Kanpur-208016, India |
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Abstract: | Raman spectra of Cs2ZnI4 single crystal have been measured in different scattering orientations covering the successive phase transitions down to 68 K. Two second order anomalies at around ice temperature (270 K) and at ~ 92 K are observed. The anomaly around ice temperature exhibits the features of a normal-incommensurate transition evidenced by softening of a low-lying lattice phonon whose frequency decreases as the transition temperature is approached from below whereas the latter one appears to arise from usual structural distortions. |
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