Propagation of zero sound in superfluid3He-B under magnetic field

Ashida, Masami; Hara, Junichiro; Nagai, Katsuhiko

doi:10.1007/bf00754635

Cited by 46 publications

(7 citation statements)

References 20 publications

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“…Since then it has been shown 18,41 that only the m J = 0 mode can couple to longitudinal sound, contrary to what was originally proposed 19,42 . Additionally, Ashida et al 18 find that the anomalies observed in longitudinal sound attenuation in nonzero field 19 can be accounted for in terms of pair-breaking coupled to J = 1 − , m J = 0 and J = 2 − , m J = 0, ±2 modes, in some combination, but that the analysis is complicated by the inhomogeneous texture associated with the experimental conditions of a transverse magnetic field. From their analysis it appears that identification of the J = 1 − mode is not yet well-established.…”

Section: Locating the New Modementioning

confidence: 99%

“…These are the dynamical fingerprints of a multi-component order parameter 14 . The order parameter collective modes of superfluid 3 He have been extensively studied 15 using acoustic absorption spectroscopy 15,16,17,18,19,20,21,22,23 .…”

mentioning

confidence: 99%

“…1: Energy levels of the collective modes, J ± , of superfluid 3 He-B that have been observed or predicted to couple to either longitudinal or transverse sound and their Zeeman splitting in a magnetic field in the limit of weak quasiparticle interactions. The 4 − and 0 + modes have not been observed and evidence for the 1 − mode is not yet well-established 18 .…”

mentioning

confidence: 99%

“…The observation of circular birefringence allows us to rule out the 0 + mode. A peak in the longitudinal sound attenuation that appears for non-zero magnetic field 19,22 was attributed 18,41 to the coupling of the J = 1 − , m J = 0 mode to the longitudinal current (see Sec. IV of the supplementary information).…”

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confidence: 99%

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Discovery of an excited pair state in superfluid 3He

et al. 2008

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Order parameter collective modes are the fingerprint of a condensed phase. The spectroscopy of these modes in superfluid 3 He and unconventional superconductors can provide key information on the symmetry of the condensate as well as the microscopic pairing mechanism responsible for the ground state and excitation energies. We report the discovery of a new collective mode in superfluid 3 He-B which we identify as an excited bound state of Cooper pairs. We use interferometry within an acoustic cavity that is very sensitive to changes in the velocity of transverse sound. Our measurements of sound velocity and mode frequency, together with the observation of acoustic birefringence indicate that this new mode is weakly bound with an excitation energy within 1% of the pair-breaking edge of 2∆. Based on the selection rules for coupling of transverse sound to a collective mode in 3 He-B, combined with the observation of acoustic birefringence near the collective mode frequency, we infer that the new mode is most likely a spin-triplet (S = 1), f -wave pair exciton (L = 3) with total angular momentum, J = 4. The existence of a pair exciton with J = 4 suggests an attractive, sub-dominant, f -wave pairing interaction in liquid 3 He. arXiv:0801.1497v1 [cond-mat.supr-con]

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Section: Locating the New Modementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Discovery of an excited pair state in superfluid 3He

et al. 2008

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“…In pure superfluid 3 He the sound propagation has been successfully described by the matrix kinetic theory, [27][28][29][30] which is the natural generalization of the Landau transport theory to weak-coupling superfluids. An alternate but equivalent formulation can be provided by the quasiclassical Keldysh Green's function method.…”

Section: Formulationmentioning

confidence: 99%

Microscopic theory of sound propagation in the superfluidHe3–aerogel system

et al. 2005

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We present a theory of sound propagation in superfluid 3 He confined in aerogel, taking dragged aerogel motion into account. The superfluid dynamics coupled with the aerogel motion is formulated by use of the Keldysh Green's function for weak-coupling superfluid Fermi liquid. We apply the theory to the hydrodynamic regime and calculate the attenuation of a hydrodynamic longitudinal sound mode, the so-called fast mode. The result is compared to the acoustic experiment reported by the Northwestern University group

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High Frequency Sound in Superfluid 3He-B

Davis

Choi²,

Pollanen³

et al. 2008

J Low Temp Phys

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We present measurements of the absolute phase velocity of transverse and longitudinal sound in superfluid 3 He-B at low temperature, extending from the imaginary squashing mode to near pair-breaking. Changes in the transverse phase velocity near pair-breaking have been explained in terms of an order parameter collective mode that arises from f -wave pairing interactions, the so-called J = 4 − mode. Using these measurements, we establish lower bounds on the energy gap in the B-phase. Measurement of attenuation of longitudinal sound at low temperature and energies far above the pair-breaking threshold, are in agreement with the lower bounds set on pair-breaking. Finally, we discuss our estimations for the strength of the fwave pairing interactions and the Fermi liquid parameter, F s 4 .

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Propagation of zero sound in superfluid3He-B under magnetic field

Cited by 46 publications

References 20 publications

Discovery of an excited pair state in superfluid 3He

Discovery of an excited pair state in superfluid 3He

Microscopic theory of sound propagation in the superfluidHe3–aerogel system

High Frequency Sound in Superfluid 3He-B

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