Crystallization of para-Hydrogen: a quantum phase transition at finite temperature?

7th Meeting of the Spanish Neutron Scattering Association

Cabrillo, C.^1 ; Fernández-Alonso, F.^2 ; Fernández-Perea, R.^1 ; Bermejo, F.J.^1 ; González, M.A.^3 ; Mondelli, C.^3 ; Farhi, E.^3

Instituto de Estructura de la Materia, IEM-CSIC, Serrano 123, Madrid

28006, Spain^1

ISIS Facility, Rutherford Appleton Laboratory, Chilton-Oxfordshire

OX11 0QX, United Kingdom^2

Institut Laue Langevin, 6 rue Jules Horowitz, Grenoble Cedex 9

38042, France^3

关键词: Finite temperatures;    Molecular displacements;    Neutron scattering measurements;    Quantum fluctuation;    Quantum phase transitions;    Rotational levels;    Temperature independents;    Temperature response;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/663/1/012006/pdf
DOI  :  10.1088/1742-6596/663/1/012006

来源: IOP

【 摘 要 】

Recent neutron scattering measurements have revealed that para-Hydrogen prepared in its fundamental state solidifies in a crystal that do not show temperature response (temperature independent molecular displacement and first rotational level linewidth as well as negligible thermal expansion). Here, it is argued that such unique behaviour in the crystal phase can be understood if the crystallization is driven by pure quantum fluctuations.