Low Temperature Specific Heat of BiOX (X = Cl, Br, and I) Single Crystals

V. Bundaa, S. Bundaa, M. Kajňakovab, A. Feherb, E. Syrkinc and S. Feodosyevc aFaculty of Information Sciences, Transcarpathian State University, Zankovetska St. 89-A, Uzhgorod 88 015, Ukraine bCenter of Low Temperature Physics, Faculty of Science, P.J. Šafarik University, Park Angelinum 9, 04154 Kosice, Slovakia cB. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov, Ukraine

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Low temperature specific heat of layered bismuth oxyhalide crystals has been studied in the temperature range from 2 to 50 K in zero and 8 T magnetic field. The expected Debye-like behaviour at the lowest temperatures (below 4-5 K) is established. Linear dependences of entropy and the Debye temperature as cross-correlation parameters are established. The small values of the Debye temperature and peculiarities of phonon spectra at lowest temperatures are discussed.

DOI: 10.12693/APhysPolA.118.986 PACS numbers: 65.40.-b, 63.22.Np