caa a22 4500 445366184 CHVBK 20180317142931.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10909-010-0256-6 doi (NATIONALLICENCE)springer-10.1007/s10909-010-0256-6 Investigating Metastable hcp Solid Helium Below Its Melting Pressure [Elektronische Daten] [F. Souris, J. Grucker, J. Dupont-Roc, P. Jacquier] We report a first attempt to produce metastable hcp solid helium below its melting pressure. A focused sound pulse is emitted along the c-axis of a mono-domain hcp helium-4 crystal starting from a static pressure just above the melting pressure. The sound pulse is made as simple as possible with one negative and one positive swing only. Density at focus is monitored by an optical interferometric method. Performed numerical simulations show that the crystal anisotropy splits the focused wave into two separate pulses, corresponding to a longitudinal wave along the c-axis and a radial one perpendicular to it. The amplification factor due to focusing remains nevertheless important. Negative pressure swings up to 0.9 bar have been produced, crossing the static melting pressure limit. Improvements in the detection method and in the focusing amplification are proposed. Springer Science+Business Media, LLC, 2010 Quantum solids nationallicence hcp solid helium nationallicence Metastability nationallicence Vacancy nationallicence Souris F. Laboratoire Kastler Brossel, ENS/CNRS/Université Paris 6, 24 rue Lhomond, 75005, Paris, France aut Grucker J. Laboratoire Kastler Brossel, ENS/CNRS/Université Paris 6, 24 rue Lhomond, 75005, Paris, France aut Dupont-Roc J. Laboratoire Kastler Brossel, ENS/CNRS/Université Paris 6, 24 rue Lhomond, 75005, Paris, France aut Jacquier P. Laboratoire Kastler Brossel, ENS/CNRS/Université Paris 6, 24 rue Lhomond, 75005, Paris, France aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 412-420 0022-2291 162:5-6<412 2011 162 10909 https://doi.org/10.1007/s10909-010-0256-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0256-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Souris F. Laboratoire Kastler Brossel, ENS/CNRS/Université Paris 6, 24 rue Lhomond, 75005, Paris, France aut NATIONALLICENCE 700 1- Grucker J. Laboratoire Kastler Brossel, ENS/CNRS/Université Paris 6, 24 rue Lhomond, 75005, Paris, France aut NATIONALLICENCE 700 1- Dupont-Roc J. Laboratoire Kastler Brossel, ENS/CNRS/Université Paris 6, 24 rue Lhomond, 75005, Paris, France aut NATIONALLICENCE 700 1- Jacquier P. Laboratoire Kastler Brossel, ENS/CNRS/Université Paris 6, 24 rue Lhomond, 75005, Paris, France aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 412-420 0022-2291 162:5-6<412 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer