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Digitale Medien

Phase transitions in the growth of4He films (1993)

Saarela, M. ; Clements, B. E. ; Krotscheck, E. ; [weitere]

Springer

Journal of low temperature physics 93 (1993), S. 971-985

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ISSN: 1573-7357

Schlagwort(e): 67.40.Vs ; 67.40.Yv ; 67.70+n ; 68.15.+e ; 68.35.Rh

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Using a microscopic, variational approach we examine the growth of4He absorbed to graphite and alkali substrates. We find that superfluid layers are formed and their behavior as a function of coverage is closely related to the one of a purely two-dimensional superfluid. The growth of a new layer undergoes a phase transition from a cluster formation into the connected superfluid when the coverage is increased. Based on the important connection to the two-dimensional fluid we propose a microscopic theory of quantum vortices in4He films at zero temperature, in which single vortices are treated as quasiparticles. We calculate the energy needed to create the single vortex, vortex inertial mass, microscopic interaction between vortices and binding energy of the vortex-antivortex pair as a function of density. We predict that at the4He superfluid density less than about 0.037 Å−2 the binding energy of the pair becomes negative, indicating a phase transition into a new state where vortex-antivortex pairs are spontaneously created.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00692043

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Digitale Medien

Flux creep in orbital glass (1994)

Kusmartsev, F. V.

Springer

Journal of superconductivity 7 (1994), S. 617-619

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ISSN: 1572-9605

Schlagwort(e): High-Tc superconductors ; orbital glass ; orbital momentum ; relaxation rate ; flux lines ; magnetization ; electron-dipole spin resonances ; topological defects ; π-rings ; Josephson effect

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: Abstract We investigate the effects of flux creep and microwave absorption on the state of orbital glass. An estimation of the relaxation rate of magnetization associated with the flux creep is made. The possibility of investigating orbital glass with the aid of electron-dipole spin resonances associated with topological defects (π-rings) is discussed. The resonances may be observed at very low temperaturesT〈1 K.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00728470

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