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

Paulson, D. N.; Krusius, M.; Wheatley, J. C.; Safrata, R. S.; Koláč, M.; Těthal, T.; Švec, Karel; Matas, Jean-Philippe

doi:10.1007/bf00116996

Cited by 9 publications

(3 citation statements)

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“…In some of these results one must note the modifications due to the new temperature scale. 33 Here we shall take the gap to be the weak coupling ABM gap, which is given by A(T) = (5/4)I/2ABcs(T) close to To z3 multiplied by the ratio [(AC/CN)meas/(AC/CN)ABM] 1/2, which has already been discussed at the end of Section 2.…”

Section: Results For the Ion Mobilitymentioning

confidence: 99%

Mobility tensor of negative ions in superfluid 3He-A

1980

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The mobility tensor of negative ions in the A phase of superfluid 3He is calculated for temperatures close to To. In this regime the scattering of superfluid quasiparticles from an electron bubble is practically elastic and the mobility tensor is expressed in terms of momentum transfer cross sections for an ion at rest. These generalized transport cross sections are obtained from the quasiparticle-ion scattering T-matrix, which we evaluate in terms of the normal state scattering amplitude. The p-wave pairing correlations in the intermediate states result in important interference effects among all partial waves in the scattering process, and, in addition, for the low-energy quasiparticles they lead to resonant states below the gap edge. These phenomena modify the scattering amplitude in the superfluid in an essential way and the differential quasiparticle-ion cross section is found to display strongly anisotropic, energy-dependent variations on the scale of the superfluid energy gap. We find that, in contrast to simple approximations, for low quasiparticle energies the parallel and perpendicular momentum transfer cross sections are very different from one another. Close to To, the calculated mobility remains rather isotropic, but at lower temperatures the anisotropy is considerably larger than predicted by simple approximations for the cross section. The computed results are compared with the available measurements.

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Section: Results For the Ion Mobilitymentioning

confidence: 99%

Mobility tensor of negative ions in superfluid 3He-A

1980

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“…Outside of Table I all of our results for splittings use the scale of Ref. 9. The ratio of the A i and A 2 splittings is essentially independent of scale.…”

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confidence: 92%

“…Although LCMN is an excellent secondary thermometer, we do not have an absolute scale. Rather, we have fitted our observed zero-field T c values (assuming the usual Curie-Weiss susceptibility) to values of T c at various pressures as tabulated by Paulson et al, 9 by Alvesalo et al, 10 and by Greywall. 11 After measuring our thermometer's sensitivity to pressure we fit each temperature scale to our data with maximum errors of ± 4 /u,K.…”

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confidence: 99%