Helium at elevated pressures: Quantum liquid with non-static shear rigidity
Helium at elevated pressures: Quantum liquid with non-static shear rigidity
复制标题
DOI：
10.1063/1.4795340
复制
发表时间：
2013-03-14
影响因子：
3.2
通讯作者：
Trachenko, K.
中科院分区：
文献类型：
--
作者：
Bolmatov, D.;Brazhkin, V. V.;Trachenko, K.
液氦的性质一直是科学家们感兴趣的课题。本文采用考虑液体非静态剪切刚度的液体声子理论，研究了压缩液体He-4的内能和热容。我们证明了液氦在高压和超临界温度下的计算和实验热容的良好协议。出乎意料的是，氦仍然是一种量子液体，在高压下，在很宽的温度范围内，支持纵向和横向的声子激发。我们发现在5 MPa-500 MPa的很宽的压力范围内，熔化温度附近的液氦既是类固态的，又是量子态的。(C)2013年美国物理学会。[http：//dx.doi.org/10.1063/1.4795340]
The properties of liquid helium have always been a fascinating subject to scientists. The phonon theory of liquids, taking into account liquid non-static shear rigidity, is employed here for studying internal energy and heat capacity of compressed liquid He-4. We demonstrate the good agreement of calculated and experimental heat capacity of liquid helium at elevated pressures and supercritical temperatures. Unexpectedly, helium remains a quantum liquid at elevated pressures for a wide range of temperature supporting both longitudinal and transverse-like phonon excitations. We have found that in the very wide pressure range of 5 MPa-500MPa, liquid helium near melting temperature is both solid-like and quantum. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4795340]