The Quest for Bose-Einstein Condensation in Solid 4He
| Autor: | Richard Azuah, Souleymane Diallo, Henry R. Glyde |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Phase transition Condensed matter physics Condensed Matter::Other Scattering Condensation Neutron scattering Condensed Matter Physics Atomic and Molecular Physics and Optics law.invention Superfluidity Supersolid law Phase (matter) General Materials Science Bose–Einstein condensate |
| Zdroj: | Journal of Low Temperature Physics. 162:449-454 |
| ISSN: | 1573-7357 0022-2291 |
| Popis: | 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 Tc= 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 below Tc. In bulk liquid 4He, the appearance of BEC below Tλ 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 n0 in solid 4He down to 65 mK, i.e. n0=(0±0.3)%, our search for BEC and its corollaries continues with improved instrumentation. |
| Databáze: | OpenAIRE |
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