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The Superfluid Phases Of 3he In Aerogel Microform
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Author :Guillaume Gervais Publisher :Ann Arbor, Mich. : University Microfilms International ISBN 13 : Total Pages : pages Book Rating :4.:/5 (517 download)
Book Synopsis The Superfluid Phases of 3He in Aerogel [microform] by : Guillaume Gervais
Download or read book The Superfluid Phases of 3He in Aerogel [microform] written by Guillaume Gervais and published by Ann Arbor, Mich. : University Microfilms International. This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis encompasses a broad study of the properties of the 'dirty' Fermi liquid and superfluid state of 3He in aerogel. The sound attenuation in the first and zero sound regime was determined with longitudinal acoustics, and the transition between the two is found to be completely obscured in aerogel by strong elastic scattering. The (P,T,B) phase diagram of the superfluid phases of 3He in 98% aerogel was determined in the range of pressure from 15 to 33 bars and up to 3 kG using high-frequency sound. The first-order transition between the A and B-phases is suppressed by a magnetic field. We show that the equilibrium phase in zero applied field is the B-phase with at most a region of A-phase ∼20 muK just below Tca at a pressure of 33.4 bars. The quadratic coefficient for magnetic field suppression of the AB-transition, ga(beta), was obtained. The pressure dependence of ga(beta) is markedly different from that for the pure superfluid, g0(beta), which diverges at a polycritical pressure (PCP) of 21 bars. We compare our results with calculations from the homogeneous scattering model for ga(beta), and find qualitatively good agreement with the experiment if the strong-coupling corrections are rescaled from known values of the beta's for pure 3He. The calculations show that the PCP in the aerogel is displaced above melting pressure and out of experimental reach for a mean free path of ∼150 nm. The nucleation of the aerogel B-phase is also studied. Primary supercooling is observed over a wide range of pressures and fields, but secondary nucleation shows no memory effect. At the interface between the pure and dirty superfluids, we find that the proximity effect is insufficient to nucleate the B-phase in either superfluid. We suggest an explanation in terms of decoherence of the order parameter on the length scale of the critical radius for nucleation.
Book Synopsis Experiments on the Phases of Superfluid 3He Confined Within Aerogel at Ultra-low Temperatures by : John E. Roberts
Download or read book Experiments on the Phases of Superfluid 3He Confined Within Aerogel at Ultra-low Temperatures written by John E. Roberts and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Exotic Properties of Superfluid 3He by : G. E. Volovik
Download or read book Exotic Properties of Superfluid 3He written by G. E. Volovik and published by World Scientific. This book was released on 1992 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the unique properties of superfluid phases of 3He, the condensed matter with the outmost broken symmetry, which combine in a surprising way the properties of ordered magnets, liquid crystals and superfluids. The complicated vacuum state of these phases with a large number of fermionic and bosonic quasiparticles and topological objects remains the vacuum in modern quantum field theories. Some of the objects and physical phenomena in 3He have strong analogy with the neutrino, W-bosons, weak interactions, gravity, chiral anomaly, Quantum Hall Effect and fractional statistics. As an example of topological objects, the quantized vortices in 3He phases are discussed in detail, including singular and continuous vortices, half-quantum vortices, broken symmetry in the vortex core and phase transitions between the vortex states with different symmetry and topology.
Book Synopsis The Superfluid Phases of Helium 3 by : Dieter Vollhardt
Download or read book The Superfluid Phases of Helium 3 written by Dieter Vollhardt and published by . This book was released on 1990 with total page 619 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Superfluid 3He in Aerogel by : James Vincent Porto
Download or read book Superfluid 3He in Aerogel written by James Vincent Porto and published by . This book was released on 1997 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Superfluid Phases Of Helium 3 by : D Vollhardt
Download or read book The Superfluid Phases Of Helium 3 written by D Vollhardt and published by CRC Press. This book was released on 1990-07-16 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: A ground-breaking look at one of the most fascinating condensed matter systems so far discovered - superfluid helium 3He
Book Synopsis Search for New Superfluid States of 3He Confined in Coherence Length Sized Nanofabricated Structures by : Nikolay Zhelev Zhelev
Download or read book Search for New Superfluid States of 3He Confined in Coherence Length Sized Nanofabricated Structures written by Nikolay Zhelev Zhelev and published by . This book was released on 2016 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Properties of superfluid 3 He are greatly affected by proximity of surfaces and disorder. In this work, we describe three different experiments for which we use torsion pendulums to study the properties of the 3 He fluid confined within the torsion pendulum heads. In the first two experiments, the fluid was embedded within anisotropic aerogel samples. In one case, we compressed an otherwise isotropic 98% open silica aerogel. In the other, we used a highly oriented, "nematically ordered" aerogel sample, which represented the limit of extremely stretched aerogel. In the third experiment, 3 He was confined within a nanofabricated high aspect ration 1080 nm deep cavity formed between patterned silicon disc bonded to a matching glass piece. We obtained data for the superfluid fraction versus temperature for a number of pressures. We observe great modifications of the superfluid phase diagram for the confined fluid in all three experiments. The order parameters for the A and B phases are distorted and the regions of stability for these phases is drastically different compared to the bulk or previous experiments with isotropic aerogels. In particular, the highly anisotropic disorder provided by the "nematically ordered" aerogel sample gives rise to a phase transition not seen in the bulk. We argue that at low pressures in the temperature region near the superfluid transition we observe a superfluid state that is closely related to Polar phase. In the experiment in which we confined the fluid within the 1080 nm deep cavity, we see an A to B phase transition at all experimental pressures. We, however, do not observe any signature of a new superfluid state (Stripe phase), which has been predicted to occur at the onset of the A to B transition.
Book Synopsis Acoustic Study of Disordered Liquid 3He in High-porosity Silica Aerogel by : Hyunchang Choi
Download or read book Acoustic Study of Disordered Liquid 3He in High-porosity Silica Aerogel written by Hyunchang Choi and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The effect of disorder is one of the most interesting and ubiquitous problems in condensed matter physics. A fundamental question, "How does a ground state evolve in response to increasing disorder?", encompasses many areas in modern condensed matter physics, especially in conjunction with quantum phase transitions. We address the same question the low temperature phases of liquid 3He which is of a special interest since, in its bulk form, it is the most well understood unconventional superfluid and the purest substance known to mankind. Unlike conventional s-wave pairing superconductors, the unconventional superconductors are vulnerable to any type of impurity, and this fact has been used to test the unconventional nature of the order parameter in heavy fermion and cuprate superconductors. The aerogel/3He system provides a unique opportunity to conduct a systematic investigation on the effects of static disorder in unconventional superfluids. We have investigated the influence of disorder, introduced in the form of 98% porosity silica aerogel, on the superfluid 3He using various ultrasound techniques. Our primary effort is in understanding the complete phase diagram of this relatively new system. In particular, the high magnetic field region of the phase diagram has not been explored until this work, and the nature of the A-like to B-like transition in this system has not been elucidated. We identified a third superfluid phase emerging in the presence of magnetic fields, which resembles, in many respects, the A1-phase in bulk. Our zero field study of the A-B transition in aerogel revealed that two phases coexist in a narrow window of temperature right below the superfluid transition. Sound attenuation measurements conducted over a wide range of temperatures and pressures show a drastically different behavior than in bulk. In particluar, in the B[beta]-like phase, our results can be interpreted as strong evidence of a gapless superfluid.
Book Synopsis Spin Dynamics of Superfluid 3He in Aerogel by : Barry Irving Barker
Download or read book Spin Dynamics of Superfluid 3He in Aerogel written by Barry Irving Barker and published by . This book was released on 1999 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Superfluid phases in a repulsive Fermi system and liquid helium 3 by : Peter Brussaard
Download or read book Superfluid phases in a repulsive Fermi system and liquid helium 3 written by Peter Brussaard and published by . This book was released on 1998 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NMR Studies of Superfluid 3He in Extremely Low-density Silica Aerogels by : Qiang Qu
Download or read book NMR Studies of Superfluid 3He in Extremely Low-density Silica Aerogels written by Qiang Qu and published by . This book was released on 2009 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Torsional Oscillator and NMR Studies of Superfluid 3HE in Aerogel by : Paul Stewart Wootton
Download or read book Torsional Oscillator and NMR Studies of Superfluid 3HE in Aerogel written by Paul Stewart Wootton and published by . This book was released on 2000 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The A-B Phase Boundary of Superfluid 3He by :
Download or read book The A-B Phase Boundary of Superfluid 3He written by and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The A-B Phase Boundary of Superfluid 3He by : A. M. Turner
Download or read book The A-B Phase Boundary of Superfluid 3He written by A. M. Turner and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements on Flowing Superfluid 3He by : J. Hutchins
Download or read book Measurements on Flowing Superfluid 3He written by J. Hutchins and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Third Sound in Superfluid 3He by : Andrew Schechter
Download or read book Third Sound in Superfluid 3He written by Andrew Schechter and published by . This book was released on 1999 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impurity Scattering in Superfluid 3He by : James Edward Baumgardner
Download or read book Impurity Scattering in Superfluid 3He written by James Edward Baumgardner and published by . This book was released on 2004 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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