Phonon triggered rhombohedral lattice distortion in vanadium at high pressure
نویسندگان
چکیده
منابع مشابه
Phonon triggered rhombohedral lattice distortion in vanadium at high pressure
In spite of the simple body-centered-cubic crystal structure, the elements of group V, vanadium, niobium and tantalum, show strong interactions between the electronic properties and lattice dynamics. Further, these interactions can be tuned by external parameters, such as pressure and temperature. We used inelastic x-ray scattering to probe the phonon dispersion of single-crystalline vanadium a...
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The pressure-induced transition of vanadium from BCC to rhombohedral structures is unique and intriguing among transition metals. In this work, the stability of these phases is revisited by using density functional theory. At finite temperatures, a novel transition of rhombohedral phases back to BCC phase induced by thermal electrons is discovered. This reentrant transition is found not driven ...
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The electronic structures and lattice dynamics of pressure-induced complex phase transitions [bcc --> hR1(110.5 degrees) --> distorted-hR1(108.2 degrees) --> bcc] in vanadium as a function of pressure up to 400 GPa have been investigated with an ab initio method using density functional perturbation theory (DFPT). At ambient pressure, the soft transverse acoustic phonon mode corresponding to Ko...
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High-pressure optical experiments have been performed on midinfrared excitations unique to the layered cuprates, yet whose physical origin has been unresolved. Measurements of high-pressure midinfrared spectra of Sr2CuCl2o2 unambiguously identify the ;2800-cm 21 absorption as an unusual quasibound two-magnon 1 phonon excitation. We further show that the broad peak centered near ;4000 cm is a fo...
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Hongquan Song,1 Fuyang Tian,1,* Qing-Miao Hu,2,† Levente Vitos,3,4,5 Yandong Wang,6 Jiang Shen,1 and Nanxian Chen1,7 1Institute for Applied Physics, University of Science and Technology Beijing, Beijing 100083, China 2Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China 3Applied Materials Physics, Department of Mater...
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ژورنال
عنوان ژورنال: Scientific Reports
سال: 2016
ISSN: 2045-2322
DOI: 10.1038/srep31887