Zero-sound determination of texture transitions in flowing superfluid3He-A

Bates, D. M.; Ytterboe, S. N.; Gould, C. M.; Bozler, H. M.

doi:10.1007/bf00681324

Cited by 15 publications

(6 citation statements)

References 31 publications

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“…The expected texture of the liquid minimizes the free energy which is parameterized in terms of l" and d. This expression can be given by F=½gtH(H" d)--lAD(?" tt) 2-½)Lr(l'" v~)2 + Fg~ad (1) where Fgrad represents the effects of distortions of the order parameter field. The gradient terms are complex and have been discussed by a number of authors.…”

Section: Introductionmentioning

confidence: 99%

Breakdown of 3He-A superflow in low magnetic fields

et al. 1992

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Using a sensitive differential pressure gauge, we have measured the limits to dissipationless superflow in bulk superfluid 3He-A far from stabilizing walls. We report the first quantitative measurements of the breakdown of bulk superflow in the A phase. In addition to confirming the existence of a finite criticai current in bulk uniform textures, we have discovered an unexpected tortuoua texture in which there is an even larger critical current. These results indicate that the current theoretical models for determining textures are incomplete.

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Section: Introductionmentioning

confidence: 99%

Breakdown of 3He-A superflow in low magnetic fields

et al. 1992

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“…Figure 1 shows calculated values of €I0 as a function of H,/H obtained by solving [ 5 ] . The continuous line is calculated for P = 0 and exhibits the ideally sharp FrCedericksz transition at H,/HF = l (12).…”

Section: Calculation Of the Texturementioning

confidence: 99%

“…The sym- For personal use only. I I defined; we therefore measured the true anisotropy coefficients rather than the effective values that have been determined in some previous experiments (4,5). The average value of HT.…”

Section: Ultrasonic Experimentsmentioning

confidence: 99%

“…The anisotropies of the ultrasonic attenuation (4,5) and ion mobility (6) have also been investigated, but the orientation of the 1 vector relative to the sound-wave vector and ion path respectively was not well defined in these experiments, thus making it difficult to deduce values for the anisotropy coefficients. In addition, Kleinberg (7) and Bates et al (5) have made investigations of the effect of flow and magnetic field on the texture in a bulk geometry. In the latter work, the observed textural transitions did not occur at the predicted velocities.…”

Section: Introductionmentioning

confidence: 99%

“…Alignment of the texture by a magnetic field has been used to indicate the existence of the anisotropy of the normal-fluid density (2) and to measure the anisotropy of the dielectric constant (3). The anisotropies of the ultrasonic attenuation (4,5) and ion mobility (6) have also been investigated, but the orientation of the 1 vector relative to the sound-wave vector and ion path respectively was not well defined in these experiments, thus making it difficult to deduce values for the anisotropy coefficients. In addition, Kleinberg (7) and Bates et al (5) have made investigations of the effect of flow and magnetic field on the texture in a bulk geometry.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of magnetic field induced textural changes in superfluid ³He–A and of the anisotropy of viscosity, superfluid density, and sound propagation

Hook¹,

Eastop²,

Faraj³

et al. 1987

Can. J. Phys.

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Textural changes induced by a magnetic field in dipole-locked superfluid ' H~-A in a slab geometry have been observed and agree well with the theoretically predicted changes. In one set of observations, ultrasound transmission at 15.15 MHz across a slab 2 mm wide was used as the probe of the texture, and in another set of measurements the textural changes were inferred from the behaviour of a torsional oscillator containing a slab of thickness 105 p,m. From the former set of observations, we deduced the anisotropy of the sound attenuation and velocity, and from the latter we calculated the anisotropy of the viscosity and the superfluid density. In both experiments the field, perpendicular to the slab, that caused instability of the uniform texture was smaller than that theoretically predicted. Observations on the A phase after warming from the B phase exhibited very different behaviour from those made after cooling from the normal phase.On a observt des changements de texture induits par un champ magnttique dans '~e -A superfluide en gtomttrie de plaque, et ces changements sont en bon accord avec les prkdictions thtoriques. Dans une sCrie d'observations, la transmission ultrasonique a 15.15 MHz a travers une plaque de 2 mm de largeur a Ct C utiliste comme sonde de la texture; dans une autre strie de mesures, les changements de texture ont CtC inftrks du comportement d'un oscillateur a torsion contenant une plaque de 105 p,m d'tpaisseur. De la premikre strie d'observations nous dtduisons I'anisotropie de I'atttnuation du son ainsi que de la vitesse; a partir de la seconde strie nous calculons I'anisotropie de la viscositC et la densitt du superfluide. Dans les deux experiences le champ, perpendiculaire a la plaque, qui provoque I'instabilitC de la texture uniforme a une valeur infirieure a la valeur prtdite thtoriquement. Les observations sur la phase A effectuies aprks un rkchauffement de la phase B font voir un comportement trks difftrent de celui qu'on observe aprbs un refroidissement de la phase normale.[Traduit par la revue]Can.

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Texture and hydrodynamics of a thin slab of superfluid3He-A in a torsional oscillator. II. Experiment

et al. 1989

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Zero-sound determination of texture transitions in flowing superfluid3He-A

Cited by 15 publications

References 31 publications

Breakdown of 3He-A superflow in low magnetic fields

Breakdown of 3He-A superflow in low magnetic fields

Investigation of magnetic field induced textural changes in superfluid ³He–A and of the anisotropy of viscosity, superfluid density, and sound propagation

Texture and hydrodynamics of a thin slab of superfluid3He-A in a torsional oscillator. II. Experiment

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Zero-sound determination of texture transitions in flowing superfluid3He-A

Cited by 15 publications

References 31 publications

Breakdown of 3He-A superflow in low magnetic fields

Breakdown of 3He-A superflow in low magnetic fields

Investigation of magnetic field induced textural changes in superfluid 3He–A and of the anisotropy of viscosity, superfluid density, and sound propagation

Texture and hydrodynamics of a thin slab of superfluid3He-A in a torsional oscillator. II. Experiment

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Investigation of magnetic field induced textural changes in superfluid ³He–A and of the anisotropy of viscosity, superfluid density, and sound propagation