Experimental determination of the $$\hat n$$ -texture of superfluid3He-B in a cylinder

Spencer, Gregory; Ihas, G. G.

doi:10.1007/bf00681879

Cited by 45 publications

(3 citation statements)

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“…To study any textural transitions we consider a cylindrical geometry with a diameter of 1 mm. Converting back the magnetic healing length as found in literature [8,11,13] to our pressures (0-6 bar) and magnetic field (15 mT), it is 5 to 10 times longer than the radius of the cylinder at 0.7 T/T c . If one starts cooling all textures initially started to grow in the flare-our configuration.…”

Section: Sh Fsupporting

confidence: 78%

“…The angle between the n-vector and magnetic field varies smoothly over the sample be-tween values fixed by the boundary conditions. Both radial dependencies are experimentally confirmed by Spencer et al [12,13].…”

Section: Sh Fsupporting

confidence: 61%

“…The magnetic healing length is proportional to 1 / / c T T B [8,11,13], meaning that it increases during cooling, and the flare-out texture gradually grows in a spiral way to the center. The growing should be able to continue as long as the boundary conditions can be fulfilled, meaning that the flare-out texture will grow as long as it is the most energetically favorable configuration.…”

Section: Sh Fmentioning

confidence: 99%

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Spin waves in the B-phase of superfluid 3He in confined cylindrical geometry

Benningshof

Jochemsen

2013

Low Temperature Physics

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We describe experiments on superfluid 3He in a cylinder of 1 mm in diameter. This geometry causes the preferred orientation of the n-vector in the superfluid B-phase to be locally different, resulting in a curved configuration across the sample. Exclusive to our experiment is the observation that we succeeded in obtaining a texture which is metastable and unchanged in our pressure and temperature ranges, most likely because the experiment is performed at low pressures and low magnetic fields. As this texture can be considered as a potential for spin waves, we had the unique opportunity to study spin waves for several pressures in exactly the same texture. Our geometry causes this texture potential to be nearly quadratic, allowing an analytic solution of the theory which can be compared to our experimental results. As predicted we find the intensities of all spin wave modes more or less equal. Increasing the pressure shows a gradual increase in the number of spin wave modes in our cell. Finally we were able to cause a transition from the metastable to the predicted stable texture, concluding unexpectedly that the metastable texture is realized if the growing (or cooling) speed is sufficiently slow.

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Section: Sh Fsupporting

confidence: 78%

Section: Sh Fsupporting

confidence: 61%