Anomalous vibrational properties of cubic boron arsenide

V. G. Hadjiev; M. N. Iliev; B. Lv; Z. F. Ren; C. W. Chu

doi:10.1103/PhysRevB.89.024308

Anomalous vibrational properties of cubic boron arsenide

V. G. Hadjiev, M. N. Iliev, B. Lv, Z. F. Ren, C. W. Chu

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Abstract

We have studied cubic boron arsenide (BAs) by Raman spectroscopy and first-principles simulations. The Raman T₂ phonon involving B vibrations in natBAs shows a complex isotope two-mode behavior, not seen before in isotopically disordered materials. The majority isotope 11B phonon at 704 cm^-1 obeys average isotopic mass dependence and mass disorder renormalization, whereas a band at 723 cm^-1 stems from predominately 10B vibrations in natBAs. The observed lack of T₂ LO-TO splitting in both natBAs and 11BAs and third- and fourth-order anharmonicity contributions compensating each other in the temperature dependence of the T₂ phonon are among the other curious vibrational properties of BAs.

Original language	English
Article number	024308
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.89.024308
Publication status	Published - 2014 Jan 28

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We have studied cubic boron arsenide (BAs) by Raman spectroscopy and first-principles simulations. The Raman T2 phonon involving B vibrations in natBAs shows a complex isotope two-mode behavior, not seen before in isotopically disordered materials. The majority isotope 11B phonon at 704 cm-1 obeys average isotopic mass dependence and mass disorder renormalization, whereas a band at 723 cm-1 stems from predominately 10B vibrations in natBAs. The observed lack of T2 LO-TO splitting in both natBAs and 11BAs and third- and fourth-order anharmonicity contributions compensating each other in the temperature dependence of the T2 phonon are among the other curious vibrational properties of BAs.",

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AU - Hadjiev, V. G.

AU - Iliev, M. N.

AU - Lv, B.

AU - Ren, Z. F.

AU - Chu, C. W.

PY - 2014/1/28

Y1 - 2014/1/28

N2 - We have studied cubic boron arsenide (BAs) by Raman spectroscopy and first-principles simulations. The Raman T2 phonon involving B vibrations in natBAs shows a complex isotope two-mode behavior, not seen before in isotopically disordered materials. The majority isotope 11B phonon at 704 cm-1 obeys average isotopic mass dependence and mass disorder renormalization, whereas a band at 723 cm-1 stems from predominately 10B vibrations in natBAs. The observed lack of T2 LO-TO splitting in both natBAs and 11BAs and third- and fourth-order anharmonicity contributions compensating each other in the temperature dependence of the T2 phonon are among the other curious vibrational properties of BAs.

AB - We have studied cubic boron arsenide (BAs) by Raman spectroscopy and first-principles simulations. The Raman T2 phonon involving B vibrations in natBAs shows a complex isotope two-mode behavior, not seen before in isotopically disordered materials. The majority isotope 11B phonon at 704 cm-1 obeys average isotopic mass dependence and mass disorder renormalization, whereas a band at 723 cm-1 stems from predominately 10B vibrations in natBAs. The observed lack of T2 LO-TO splitting in both natBAs and 11BAs and third- and fourth-order anharmonicity contributions compensating each other in the temperature dependence of the T2 phonon are among the other curious vibrational properties of BAs.

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