Orbital motions in 3He-A

Krusius, M.; Paulson, D. N.; Wheatley, J. C.

doi:10.1007/bf00114998

Cited by 54 publications

(4 citation statements)

References 22 publications

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“…Geometric details of the measuring coils are given in Ref. 13. The magnetic temperature was measured using these coils and a SQUID-based SHE mutual inductance bridge system capable of a precision of about one part in 105 .…”

Section: Methodsmentioning

confidence: 99%

Magnetic thermometry to below one millikelvin with lanthanum-diluted cerium magnesium nitrate

Paulson¹,

Krusius²,

Wheatley³

et al. 1979

J Low Temp Phys

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Measurements are presented of the pressure and magnetic temperature coordinates of the phase diagram of liquid 3He using a powdered CeoosLao.9s magnesium nitrate thermometer in the shape of a right circular cylinder with diameter equal to height. The lowest magnetic temperature observed with the thermometer is 0.41 inK. The magnetic temperature of the intersection of the second-order line with the melting curve is 2.625mK, and the critical temperature at zero pressure is 1.055mK. The difference between To* and TaB* extrapolated to melting pressure is 0.57 mK, in excellent agreement with the difference TA --T~ found from measurements along the melting curve. The present data are compared with the La Jolla provisional absolute scale based on noise thermometry and zero sound. We make the assumption that the absolute temperature T and the present magnetic temperature T* are related by T = T* + A and use the resultant scale to reanalyze a variety of experimental results that had been given in terms of the La Jolla provisional scale.

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Section: Methodsmentioning

confidence: 99%

Magnetic thermometry to below one millikelvin with lanthanum-diluted cerium magnesium nitrate

Paulson¹,

Krusius²,

Wheatley³

et al. 1979

J Low Temp Phys

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“…As usual with broken symmetries, in each domain a certain value of N is established at cooling down of the superconductor because of fluctuating initial parameters, and it may be different from cooling to cooling, as in 3 He [14]. Large samples will have multi-domain structure.…”

Section: And In Absence Of External Fields E(n=1)=e(n=-1)mentioning

confidence: 99%

“…Another way to find an answer is to look into the closely related system 3 He-A, where coherent oscillations between chiral states were detected experimentally [14], [17]. There is an analogy with instantons in describing coherent oscillations of the orbital moment between states L and -L [12], [18].…”

Section: B Experimental Implicationsmentioning

confidence: 99%

Triplet superconductors from the viewpoint of basic elements for quantum computers

Gulian

Wood

2003

IEEE Trans. Appl. Supercond.

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Abstract-We discuss possibilities of utilizing superconductors with Cooper condensates in triplet pairing states (where the spin of condensate pairs is S=1) for practical realization of quantum computers. Superconductors with triplet pairing condensates have features that are unique and cannot be found in the usual (singlet pairing, S=0) superconductors. The symmetry of the order parameter in some triplet superconductors (e.g., ruthenates) corresponds to doubly-degenerate chiral states. These states can serve as qubit base states for quantum computing.

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“…A detailed description of the apparatus is given in Ref. 10. A cube of fused quartz 1.27 cm on a side has three mutually perpendicular and face-centered holes 0.8 cm in diameter ground through it.…”

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confidence: 99%

Absence of an orientational electric field effect in superfluid 3He-A

Paulson

Wheatley

1978

J Low Temp Phys

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Measurements at 29.4 bar using zero-sound propagation, which is very sensitive to the orientation of the t field in 3He-A, show that any steady orientational effect of an electric field is less than • of the value expected from the simple theory.In 1974 Delrieu 1 suggested that an electric field E should tend to orient the i" field in superfluid 3He-A,t owing to a coherent mutual orientational energy of the induced electric dipole moments resulting from the orbital motion of the superfluid pairs. The effect was looked for by Gully et al., 4 who studied the elliptical polarization of the resonant magnetism in crossed electric and magnetic fields with the 3He-A confined to the 1-mm gaps separating a stack of parallel plates. The experiment gave negative results, not completely in the sense that there was no effect of electric field, but rather in the sense that the effect observed appeared to have the wrong sign. Avenel et al. 5 found no electric field effect in 3He-A, even on applying 25 kV/cm. Explanations of these discrepancies have included the possibility of a coupling tending to make t parallel rather than perpendicular to E, domination of the orientation of t by the plate boundaries, 6 and a substantial reduction in the theoretically predicted coupling 7 due to the differences in the coherent electric dipolar energy between bare 3He atoms and 3He quasiparticles. Very recently Fomin et al.8~, studied the effect on the calculated electric orientational energy of a polarization potential between 3He atoms and found that at saturated vapor pressure the orientational effect would be reduced to 4 • 10 -3 of that calculated using the

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Orbital motions in 3He-A

Cited by 54 publications

References 22 publications

Magnetic thermometry to below one millikelvin with lanthanum-diluted cerium magnesium nitrate

Magnetic thermometry to below one millikelvin with lanthanum-diluted cerium magnesium nitrate

Triplet superconductors from the viewpoint of basic elements for quantum computers

Absence of an orientational electric field effect in superfluid 3He-A

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