Experimental investigation of two-phonon absorption by the real squashing mode in superfluid 3He-B

J.P. Pekola; K. Torizuka; A. J. Manninen; H. Alles; O. V. Lounasmaa

doi:10.1016/0921-4526(92)90202-4

Experimental investigation of two-phonon absorption by the real squashing mode in superfluid ³He-B

J.P. Pekola, K. Torizuka, A. J. Manninen, H. Alles, O. V. Lounasmaa

Not published at VTT

Helsinki University of Technology

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4 Citations (Scopus)

Abstract

We report on investigations of a nonlinear parametric excitation of the real squashing (RSQ) collective mode in superfluid ³He-B. Two-phonon absorption (TPA) at f_s + f_p = f_rsq has been observed by two coincident zero sound pulses, with the signal and the pump wave frequencies at f_s and f_p, respectively. We have also discovered and studied the Zeeman splitting of TPA in a magnetic field, which is a characteristic feature of the J = 2⁺ mode in the linear response regime. The dependence of the mode frequency on the magnitude of the wave vector has been investigated; this can be done easily in parametric measurements only. In our earlier, preliminary observations, the coupling of the RSQ mode by TPA was weaker than theory predicted; the discrepancy has now been systematically studied and clarified.

Original language	English
Pages (from-to)	238-243
Number of pages	6
Journal	Physica B: Physics of Condensed Matter
Volume	178
Issue number	1-4
DOIs	https://doi.org/10.1016/0921-4526(92)90202-4
Publication status	Published - 2 May 1992
MoE publication type	A1 Journal article-refereed

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title = "Experimental investigation of two-phonon absorption by the real squashing mode in superfluid 3He-B",

abstract = "We report on investigations of a nonlinear parametric excitation of the real squashing (RSQ) collective mode in superfluid 3He-B. Two-phonon absorption (TPA) at fs + fp = frsq has been observed by two coincident zero sound pulses, with the signal and the pump wave frequencies at fs and fp, respectively. We have also discovered and studied the Zeeman splitting of TPA in a magnetic field, which is a characteristic feature of the J = 2+ mode in the linear response regime. The dependence of the mode frequency on the magnitude of the wave vector has been investigated; this can be done easily in parametric measurements only. In our earlier, preliminary observations, the coupling of the RSQ mode by TPA was weaker than theory predicted; the discrepancy has now been systematically studied and clarified.",

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T1 - Experimental investigation of two-phonon absorption by the real squashing mode in superfluid 3He-B

AU - Pekola, J.P.

AU - Torizuka, K.

AU - Manninen, A. J.

AU - Alles, H.

AU - Lounasmaa, O. V.

PY - 1992/5/2

Y1 - 1992/5/2

N2 - We report on investigations of a nonlinear parametric excitation of the real squashing (RSQ) collective mode in superfluid 3He-B. Two-phonon absorption (TPA) at fs + fp = frsq has been observed by two coincident zero sound pulses, with the signal and the pump wave frequencies at fs and fp, respectively. We have also discovered and studied the Zeeman splitting of TPA in a magnetic field, which is a characteristic feature of the J = 2+ mode in the linear response regime. The dependence of the mode frequency on the magnitude of the wave vector has been investigated; this can be done easily in parametric measurements only. In our earlier, preliminary observations, the coupling of the RSQ mode by TPA was weaker than theory predicted; the discrepancy has now been systematically studied and clarified.

AB - We report on investigations of a nonlinear parametric excitation of the real squashing (RSQ) collective mode in superfluid 3He-B. Two-phonon absorption (TPA) at fs + fp = frsq has been observed by two coincident zero sound pulses, with the signal and the pump wave frequencies at fs and fp, respectively. We have also discovered and studied the Zeeman splitting of TPA in a magnetic field, which is a characteristic feature of the J = 2+ mode in the linear response regime. The dependence of the mode frequency on the magnitude of the wave vector has been investigated; this can be done easily in parametric measurements only. In our earlier, preliminary observations, the coupling of the RSQ mode by TPA was weaker than theory predicted; the discrepancy has now been systematically studied and clarified.

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Experimental investigation of two-phonon absorption by the real squashing mode in superfluid ³He-B

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