Raman and infrared spectra of CdIn2S4 and ZnIn2S4 |
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| Authors: | WK Unger B Farnworth JC Irwin H Pink |
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| Institution: | Department of Physics, Simon Fraser University, Burnaby, B.C., Canada V5A 1S6;Forschungslaboratorien der Siemens AG, 8 München 80, Federal Republic of Germany |
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| Abstract: | Four one-phonon Raman lines have been found in CdIn2S4 (ZnIn2S4) spinels at 92 (72) cm-1, 186 (184) cm-1, 246 (253) cm-1, and 367 (372) cm-1 for incident photon energies well below the energy gap EG ～ 2.4 (2.2) eV at 300 K. For photon energies close to EG, the 367 cm-1 mode underwent a resonant enhancement in CdIn2S4 and four infrared active but Raman forbidden F1u modes appeared in the CdIn2S4 and ZnIn2S4 Raman spectra: TO modes at 226 (221) cm-1 and 309 (312) cm-1, and LO modes at 274 (272) cm-1 and 340 (342) cm-1. |
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