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Abstract
The article presents the state of the art and reviews the literature on the long-standing problem of the possibility for a sample to be at the same time solid and superfluid. Theoretical models, numerical simulations, and experimental results are discussed.
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Pratt EJ, Hunt B, Gadagkar V, Yamashita M, Graf MJ, Balatsky AV, Davis JC. Interplay of Rotational, Relaxational, and Shear Dynamics in Solid
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He. Science 2011; 332:821-4. [DOI: 10.1126/science.1203080] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- E. J. Pratt
- Laboratory for Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
- Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93016, USA
| | - B. Hunt
- Laboratory for Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - V. Gadagkar
- Laboratory for Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
| | - M. Yamashita
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - M. J. Graf
- Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - A. V. Balatsky
- Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - J. C. Davis
- Laboratory for Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
- School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, UK
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Day J, Syshchenko O, Beamish J. Nonlinear elastic response in solid helium: critical velocity or strain? PHYSICAL REVIEW LETTERS 2010; 104:075302. [PMID: 20366894 DOI: 10.1103/physrevlett.104.075302] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2009] [Revised: 01/24/2010] [Indexed: 05/29/2023]
Abstract
Torsional oscillator experiments show evidence of mass decoupling in solid 4He. This decoupling is amplitude dependent, suggesting a critical velocity for supersolidity. We observe similar behavior in the elastic shear modulus. By measuring the shear modulus over a wide frequency range, we can distinguish between an amplitude dependence which depends on velocity and one which depends on some other parameter such as displacement. In contrast with the torsional oscillator behavior, the modulus depends on the magnitude of stress, not velocity. We interpret our results in terms of the motion of dislocations which are weakly pinned by 3He impurities but which break away when large stresses are applied.
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Affiliation(s)
- James Day
- Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2G7, Canada
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West JT, Lin X, Cheng ZG, Chan MHW. Supersolid behavior in confined geometry. PHYSICAL REVIEW LETTERS 2009; 102:185302. [PMID: 19518884 DOI: 10.1103/physrevlett.102.185302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Revised: 03/28/2009] [Indexed: 05/27/2023]
Abstract
We have carried out torsional oscillator and heat capacity measurements on solid 4He samples grown within a geometry which restricts the helium to thin (150 microm) cylindrical disks. In contrast with previously reported values from Rittner and Reppy of 20% nonclassical rotational inertia for similar confining dimensions, 0.9% nonclassical rotational inertia (consistent with that found in bulk samples and samples embedded in porous media) was observed in our torsional oscillator cell. In this confined geometry, the heat capacity peak is consistent with that found in bulk solid samples of high crystalline quality.
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Affiliation(s)
- J T West
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Hunt B, Pratt E, Gadagkar V, Yamashita M, Balatsky AV, Davis JC. Evidence for a Superglass State in Solid
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He. Science 2009; 324:632-6. [DOI: 10.1126/science.1169512] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- B. Hunt
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
| | - E. Pratt
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
| | - V. Gadagkar
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
| | - M. Yamashita
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - A. V. Balatsky
- T-Division, Center for Integrated Nanotechnologies, MS B 262, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - J. C. Davis
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, Scotland, UK
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Graf MJ, Balatsky AV, Nussinov Z, Grigorenko I, Trugman SA. Torsional oscillators and the entropy dilemma of putative supersolid4He. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1742-6596/150/3/032025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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