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<p>A new physical phenomenon—the dominance of the isotopic mass effect over the strain contribution in cubic crystals, which is manifested in <i>a negative</i> shift of a phonon mode—has been discovered. The universality of the relation ω ~ μ<sup>–1/2</sup> for symmetric lattices has been experimentally proven on the example of 3C-SiC. The contrast with <i>a positive</i> shift in anisotropic 4H/6H-SiC proves the key role of crystal symmetry in the competitive separation of the mass effect and strain contributions.</p>

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Negative Isotopic Shift of the LO Phonon in 3C-SiC: A Universal Mechanism of Mass Effect Dominance in Cubic Crystals

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  • 发表日期：

    2025年10月1日

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  • M. V. Dolgopolov,
  • A. S. Chipura

摘要

A new physical phenomenon—the dominance of the isotopic mass effect over the strain contribution in cubic crystals, which is manifested in a negative shift of a phonon mode—has been discovered. The universality of the relation ω ~ μ–1/2 for symmetric lattices has been experimentally proven on the example of 3C-SiC. The contrast with a positive shift in anisotropic 4H/6H-SiC proves the key role of crystal symmetry in the competitive separation of the mass effect and strain contributions.