多铁性
声子
凝聚态物理
带隙
极化(电化学)
物理
比热
热容
磁场
材料科学
铁电性
化学
热力学
量子力学
物理化学
电介质
作者
A. Apostolov,I. N. Apostolova,J. M. Wesselinowa
标识
DOI:10.1016/j.ssc.2021.114546
摘要
The recently experimentally observed multiferroic properties of GaV4S8 are studied using a microscopic model and a Green’s function technique. The polarization P in 〈111〉 direction is saturated at low temperatures. For higher temperatures P increases and goes through a maximum at TN ∼ 13 K, then decreases strongly approaching the phase transition temperature Tfe. The polarization decreases by increasing an external magnetic field h and at higher h values the maximum vanishes. The specific heat Cp shows two maxima, at TN and TJT. Cp(h) is also observed. We have discussed the electronic and phonon contributions to Cp in dependence on the temperature region. The phonon energy ω for the phonon mode at 440 cm−1 and their damping γ are also calculated in dependence on temperature T and magnetic field h. P(h) and ω(h) is an evidence for the multiferroic behavior. The temperature dependence of the band gap energy for GaV4S8 and GaNb4S8 is obtained.
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