Superfluid phase of {sup 3}He-B near the boundary

Journal Article · Sat Oct 01 04:00:00 EDT 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.72.134503· OSTI ID:20719601

Brusov, Peter ^[1]; Brusov, Pavel ^[2]

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1. Physical Research Institute, 194 Stachki Avenue, Rostov-on-Don 344090 (Russian Federation)
2. Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106-7079 (United States)

Having analyzed old and some of the most recent transverse sound experiments in superfluid {sup 3}He-B we are now able to solve the old problem of superfluid quantum liquids in confined geometry--that is, the boundary state of {sup 3}He-B. We pay attention to the difference between the transverse sound experiments data and those of longitudinal sound experiments. We consider several possible explanations of the above experimental data: the existence of a new superfluid phase in the vicinity of the boundary, excitation of different branches of the squashing mode by longitudinal and transverse sound, and deformation of B phase near the boundary. We have come to the conclusion that the last possibility seems the most likely and that the boundary state of {sup 3}He-B is indeed a deformed B phase, as suggested by Brusov and Popov 20 years ago for the case of the presence of external perturbations such as magnetic and electric fields. Our result implies that the influence of the wall or, generally speaking, of confined geometry does not lead to the existence of a new phase near the boundary, as has been suggested up to now, but like other external perturbations (e.g., magnetic and electric fields) the wall deforms the order parameter of the B phase and this deformation leads to some important consequences. In particular, the frequencies of collective modes in the vicinity of the boundary change by up to 20%. One other evidence in support of our conclusion with regard to the realization of the deformed B-phase in {sup 3}He-B phase near the boundary is the peak in transverse ultrasound impedance observed at a temperature of 0.94 T{sub c} and interpreted by the authors as a manifestation of the transition from a supercooled A-phase to B-phase, which is really the transition between A-phase and deformed B-phase.

• OSTI ID: 20719601
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 13 Vol. 72; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOUND STATE
DEFORMATION
DISTURBANCES
ELECTRIC FIELDS
EXCITATION
GEOMETRY
HELIUM 3
IMPEDANCE
LIQUIDS
ORDER PARAMETERS
PERTURBATION THEORY
SOUND WAVES
SUPERFLUIDITY