Journal
JOURNAL OF APPLIED PHYSICS
Volume 113, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4795340
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Funding
- EPSRC
- Thomas Young Centre for Junior Research Fellowship
- Cornell University
- Engineering and Physical Sciences Research Council [EP/C540603/2, EP/C540603/1] Funding Source: researchfish
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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]
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