Supersolidity of glasses

Andreev, Aleksandr F.

doi:10.1134/s0021364007110124

Cited by 214 publications

(341 citation statements)

References 9 publications

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“…For example, grain boundaries [23] and dislocations [24] have been shown in simulations to support mass flow, as has a glassy, or "superglass" phase of solid 4 He [25][26][27]. We have previously reported on quantitative aspects of some of these scenarios, and how they relate to our earlier observations [13,14].…”

mentioning

confidence: 98%

Observation of thermomechanical equilibration in the presence of a solidH4econduit

Ray

Hallock

2010

Phys. Rev. B

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We observe a thermo-mechanical effect when a chemical potential difference is created by a temperature difference imposed between two liquid reservoirs connected to each other through Vycor rods in series with solid hcp 4 He. By creating a temperature difference, ∆T , between the two reservoirs, we induce a rate-limited growth of a pressure difference between the two reservoirs, ∆P . In equilibrium ∆P vs.∆T is in quantitative agreement with the thermo-mechanical effect in superfluid helium. These observations confirm that below ∼ 600 mK a flux-limited flow exists through the solid helium.

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confidence: 98%

Observation of thermomechanical equilibration in the presence of a solidH4econduit

Ray

Hallock

2010

Phys. Rev. B

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“…24 it was shown how a dislocation condensate may generally enhance and trigger superfluid behavior via a Higgs type mechanism. In the context of torsional oscillator anomalies, we wish to briefly note that aside from dislocation dynamics [14][15][16][17][18][19][20][21] and an NCRI effect that may result from extended supersolid regions such as the ones that we find may accompany a dislocation core, yet another possible mechanism that will lead to a reduced torsional oscillator period is that of finite shear penetration depths 24 wherein dislocations screen applied external shear and thus lead to an effective reduced moment of inertia.…”

Section: Discussionmentioning

confidence: 99%

“…13 The torsional oscillator findings can arise from material characteristics alone. [14][15][16][17][18][19][20][21] In particular, the thermodynamics and transient dynamics of distributed processes in amorphous or general non-equilibrated solids can currently fit 9,14 observed results. Indeed, later numerical results point towards such a possibility.…”

Section: Introductionmentioning

confidence: 99%

Influence of elastic deformations on the supersolid transition

et al. 2011

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We study within the Ginzburg-Landau (GL) theory of phase transitions how elastic deformations in a supersolid lead to local changes in the supersolid transition temperature. The GL theory is mapped onto a Schrödinger-type equation with an effective potential that depends on local dilatory strain. The effective potential is attractive for local contraction and repulsive for local expansion. Different types of elastic deformations are studied. We find that a contraction (expansion) of the medium that may be brought about by either externally applied or internal strain leads to a higher (lower) transition temperature as compared to the unstrained medium. In addition, we investigate edge dislocations and illustrate that the local transition temperature may be increased in the immediate vicinity of the dislocation core. Our analysis is not limited to supersolidity. Similar strain effects should also play a role in superconductors.

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“…Then, a phase transition may continue as a second order transition; however, finite values of ∆V , and hence ∆S, at the termination point, a lack of divergence of thermal expansivity 1/L(dL/dT ) and an unusual deterioration of the related peaks, which should indicate a second order transition, prevent us from accepting this scenario 17 . Instead, we hypothesize that the Frenkel concept of heterophase fluctuations may be applicable 20,21 . Heterophase fluctuations, similar to quenched impurities, smear a first order phase transition starting at some critical value of magnetic field.…”

Section: Discussionmentioning

confidence: 99%

Thermal expansion and magnetovolume studies of the itinerant helical magnet MnSi

Petrova

Стишов

2016

Phys. Rev. B

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Thermal expansion and forced magnetostriction of MnSi were measured as a function of temperature down to 5 K and magnetic field to 3 T. The small length (volume) discontinuity at the magnetic phase transition in MnSi decreases with application of magnetic field to a value ∆L/L ∼ 10 −7 , and then suddenly the discontinuity seemingly jumps to zero. Thermal expansivity peaks strongly deteriorate with magnetic fields. No specific features identifying a tricritical point were observed. We propose that the Frenkel concept of heterophase fluctuations may be relevant in the current case. Therefore, we suggest that the magnetic phase transition in MnSi always remains first order at any temperature and magnetic field, but the transition is progressively smoothed by heterophase fluctuations. These results question the applicability of a model of a fluctuation-induced first order phase transition for MnSi. Probably a model of coupling of an order parameter with other degrees of freedom is more appropriate.

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Supersolidity of glasses

Abstract: Supersolidity of glasses is explained as a property of an unusual state of condensed matter. This state is essentially different from both normal and superfluid solid states. The mechanism of the phenomenon is the transfer of mass by tunneling two level systems.

Cited by 214 publications

References 9 publications

Observation of thermomechanical equilibration in the presence of a solidH4econduit

Observation of thermomechanical equilibration in the presence of a solidH4econduit

Influence of elastic deformations on the supersolid transition

Thermal expansion and magnetovolume studies of the itinerant helical magnet MnSi

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