<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>A</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>A</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Transitions in Superfluid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">H</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mp

Choi, Hyun Joon; Gray, A. J.; Vicente, C. L.; Xia, J. S.; Gervais, G.; Halperin, W. P.; Mulders, N.; Lee, Y.

doi:10.1103/physrevlett.93.145302

Cited by 24 publications

(20 citation statements)

References 23 publications

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“…But higher field experiments are required, as well as measurements with 4 He preplating, to reach a firm conclusion. In this spirit Choi et al 72) extended the field range of Gervais et al 21) to H ¼ 14 T using the same aerogel sample, and their results are reproduced in Fig. 13.…”

Section: )mentioning

confidence: 49%

“…13. Splitting of the A 1 À A 2 transition at high magnetic field for superfluid 3 He in a 98% aerogel (solid circles and crosses) and in pure 3 He (open circles) at two pressures by Choi et al 72) at the University of Florida. The linear slopes with magnetic field are rather similar for pure and aerogel superfluids.…”

Section: Specific Heat Thermal Conductivity Gaplessnessmentioning

confidence: 99%

“…(2) is correct then we can use the i 's from Table I to determine the asymmetry ratio predicted for the robust and axial states and compare with experiment. 72) For the axial state the ratio is expressed in terms of the i 's given by eq. (13) for which we find r between 1.0 and 1.5, increasing with increasing pressure consistent with the experimental results r a & 1:0.…”

Section: Superfluidmentioning

confidence: 99%

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Impurity Effects of Aerogel in Superfluid³He

et al. 2008

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The discovery of superfluid 3 He in high porosity silica aerogels, and subsequent experimental and theoretical work, have led to a better general understanding of quasiparticle scattering from impurities in unconventional pairing systems. It is immensely helpful for understanding impurity effects in the case of superfluid 3 He that the structure of its order parameter is well-established. An overview of impurity effects is presented with emphasis on those experiments which have a quantitative interpretation in terms of theoretical models for homogeneous and inhomogeneous scattering. The latter can account successfully for most experimental results.

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Section: )mentioning

confidence: 49%

Section: Specific Heat Thermal Conductivity Gaplessnessmentioning

confidence: 99%

Section: Superfluidmentioning

confidence: 99%

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Impurity Effects of Aerogel in Superfluid³He

et al. 2008

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“…Both theoretical 53,54) and experimental studies have been carried out on various aerogel-3 He systems. Zero sound propagation was measured in a 98% porosity Aerogel in magnetic field up to 15 T. 55) The measurements showed that indeed the superfluid transition split into two as evidence for the appearance of A 1 phase in liquid 3 He confined in the Aerogel. The splittings were similar to those in bulk and indicated that the impuritydoped superfluid 3 He behaved as a p-wave superfluid.…”

Section: Phase Diagrammentioning

confidence: 99%

Spin Polarized Superfluid³He A₁

Kojima

Ishimoto

2008

J. Phys. Soc. Jpn.

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Under applied magnetic field, the originally single superfluid 3 He transition near 3 mK in zero field splits into two transitions between which a new A 1 phase emerges. The two second order transitions are marked by abrupt changes in viscosity, zero sound attenuation and nuclear magnetic resonance. To date, the maximum magnetic field for producing A 1 phase is 15 T. The A 1 phase has been identified with a spin-polarized (ferromagnetic) superfluid system which breaks the relative symmetry between spin, orbit and gauge spaces. A superfluid mass current in A 1 is simultaneously a spin current resulting in the propagation of spin-entropy wave. Experiments with spin-entropy wave provide measurements of anisotropic superfluid density and strong coupling parameters, spin diffusion coefficient and texture transformations. Owing to the spin-polarized nature, superflows may be generated by applied magnetic field gradients and measured from the induced magnetic fountain pressure. The mechanical spin density detector is developed to measure the spin relaxation in A 1 phase. The observed unexpected temperature dependence of the spin relaxation time gives evidence that the A 1 phase contains a small amount of the predicted minority spin condensate from dipolar interaction energy.KEYWORDS: spin-polarized system, superfluid 3 He, magnetic fountain effect, spin pump, second sound, high magnetic field

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“…The phase diagram of 3 He/aerogel ͑with mostly 98% porosity͒ has been studied using a variety of techniques. [5][6][7][8][9][10][11] To date, three distinct superfluid phases have been observed in 3 He/aerogel; these are called the A, B, and A 1 phases 10 as in the bulk, although the detailed structures of the order parameters ͑especially the orbital component͒ have not been identified. Early studies using NMR 6 and torsional oscillator 5 measurements on 3 He in 98% porosity aerogel found substantial depression in the superfluid transition and a theoretical account based on the homogeneous isotropic scattering model ͑HISM͒ was provided.…”

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confidence: 99%

A−Btransition of superfluidHe3in aerogel and the effect of anisotropic scattering

et al. 2005

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We report the results of high-frequency acoustic shear impedance measurements on superfluid 3 He confined in 98% porosity silica aerogel. Using 8.69 MHz continuous wave excitation, we measured the acoustic shear impedance as a function of temperature for the sample pressures of 28.4 and 33.5 bar. We observed the A-B transition on warming in zero magnetic field. Our observations show that the A and B phases in aerogel coexist in a temperature range of about 100 K in width. We propose that differences in the relative stability of the A and B phases arising from anisotropic scattering can account for our observations.

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A1andA2Transitions in SuperfluidHe

Cited by 24 publications

References 23 publications

Impurity Effects of Aerogel in Superfluid³He

Impurity Effects of Aerogel in Superfluid³He

Spin Polarized Superfluid³He A₁

A−Btransition of superfluidHe3in aerogel and the effect of anisotropic scattering

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A1andA2Transitions in SuperfluidHe

Cited by 24 publications

References 23 publications

Impurity Effects of Aerogel in Superfluid3He

Impurity Effects of Aerogel in Superfluid3He

Spin Polarized Superfluid3He A1

A−Btransition of superfluidHe3in aerogel and the effect of anisotropic scattering

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Impurity Effects of Aerogel in Superfluid³He

Impurity Effects of Aerogel in Superfluid³He

Spin Polarized Superfluid³He A₁