caa a22 4500 445365927 CHVBK 20180317142930.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10909-010-0258-4 doi (NATIONALLICENCE)springer-10.1007/s10909-010-0258-4 The Quest for Bose-Einstein Condensation in Solid 4He [Elektronische Daten] [S. Diallo, R. Azuah, H. Glyde] Ever since the seminal torsional oscillator (TO) measurements of Kim and Chan which suggested the existence of a phase transition in solid 4He, from normal to a ‘supersolid' state below a critical temperature T c= 200 mK, there has been an unprecedented amount of excitement and research activity aimed at better understanding this phase. Despite much work, this remarkable phase has yet to be independently confirmed by conventional scattering techniques, such as neutron scattering. We have carried out a series of neutron scattering measurements, which we here review, aimed at observing Bose-Einstein condensation (BEC) in solid 4He at temperatures belowT c. In bulk liquid 4He, the appearance of BEC below T λ signals the onset of superfluidity. The observation of a condensate fraction in the solid would provide an unambiguous confirmation for ‘supersolidity'. Although, our measurements have not yet revealed a non-zero condensate fraction or algebraic off diagonal long-range order n 0 in solid 4He down to 65mK, i.e. n 0=(0±0.3)%, our search for BEC and its corollaries continues with improved instrumentation. Springer Science+Business Media, LLC, 2010 BEC of excitations nationallicence Supersolids nationallicence Glasses and defects nationallicence Diallo S. Spallation Neutron Source, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA aut Azuah R. NIST Center for Neutron Research, NIST, 20899, Gaithersburg, MD, USA aut Glyde H. Department of Physics and Astronomy, University of Delaware, 19716, Newark, DE, USA aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 449-454 0022-2291 162:5-6<449 2011 162 10909 https://doi.org/10.1007/s10909-010-0258-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0258-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Diallo S. Spallation Neutron Source, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA aut NATIONALLICENCE 700 1- Azuah R. NIST Center for Neutron Research, NIST, 20899, Gaithersburg, MD, USA aut NATIONALLICENCE 700 1- Glyde H. Department of Physics and Astronomy, University of Delaware, 19716, Newark, DE, USA aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 449-454 0022-2291 162:5-6<449 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer