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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Vibrational properties of delafossite CuGaO_2 at ambient and high pressures
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Vibrational properties of delafossite CuGaO_2 at ambient and high pressures

机译:铜铁矿CuGaO_2在常压和高压下的振动特性

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摘要

In this paper we investigate the vibrational properties of CuGaO_2 delafossite by means of Raman experiments and ab initio calculations. Both investigations have been performed at ambient pressure and also at high pressure. The two Raman-active modes have frequencies w_(E_g) =368± 1 cm~(-1) and w_(A_(1g)) =729± 1 cm~(-1), and pressure coefficients 2.78±0.03 cm~(-1)/GPa (E_g) and 4.64±0.09 cm~(-1)/GPa (A_(1g)). Raman experiments indicate the existence of a phase transition beginning at 26 ± 1 GPa. At about the same pressure, ab initio calculations show the presence of a dynamical instability, possibly related to the phase transition. The phonon dispersion curves are also discussed.
机译:在本文中,我们通过拉曼实验和从头算计算研究了CuGaO_2铜铁矿的振动特性。两种研究均在环境压力和高压下进行。两种拉曼激活模式的频率w_(E_g)= 368±1 cm〜(-1)和w_(A_(1g))= 729±1 cm〜(-1),压力系数为2.78±0.03 cm〜( -1)/ GPa(E_g)和4.64±0.09 cm〜(-1)/ GPa(A_(1g))。拉曼实验表明存在从26±1 GPa开始的相变。在大约相同的压力下,从头算计算表明存在动态不稳定性,可能与相变有关。还讨论了声子色散曲线。

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