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Abstracts
P2.33
The spectroscopy of collective modes in unconventional
superconductors and superfluids
Brusov Peter(1), Filatova Tatiana(2)
(1) Financial University, Applied Mathematics faculty, Moscow
(2) Financial University, Financial manegement faculty, Moscow 49
Leningradsky Prospekt, Moscow, Russia, 125993, GSP-3
We study the collective properties of unconventional superconductors and
superfluids. We consider superfluid phases of
3
He within path integral technique
and calculated the complete collective mode spectrum in different phases
of superfluid
3
He. After the discovery of collective modes in unconventional
superconductors (USC), their study becomes very important. Collective modes
(CM) in HTSC exhibit themselves in many experiments: ultrasound attenuation
(UA) and microwave absorption (MWA), neutron scattering, photoemission and
Raman scattering, etc. The contribution of collective modes to UA and MWA may
be substantial. We consider two-dimensional and three-dimensional models of p-
and d-pairing for superconductors built by the path integration technique. Within
these models we calculate the collective excitations in different unconventional
superconductors [high temperature superconductors (HTSC), heavy fermion
superconductors (HFSC), etc.] under p- and d-pairing. We consider both bulk and
2D systems. Some recent ideas concerning realization in HTSC of the mixtures of
different states are investigated. Obtained results could be used for interpretation
of the sound attenuation and microwave absorption data as well as for identifcation
of the type of pairing and order parameter in unconventional superconductors.
They allow us to distinguish pure d-wave state from the mixture of two d-wave
states in HTSC. We create new direction in unconventional superconductors and
superfluids: “The spectroscopy of collective modes”.
P2.34
Superfluid
3
He-B in the vicinity of a boundary
Brusov Peter(1), Filatova Tatiana(2)
(1) Financial University, Applied Mathematics faculty, Moscow
(2)Financial University, Financial management faculty, Moscow 49 Leningradsky
Prospekt, Moscow, Russia, 125993, GSP-3.
We have analyzed transverse sound experiments in superfluid
3
He -B, where
some peaks in the transverse sound absorption have been observed. Our analysis
of existing experimental data leads us to a conclusion that the deformed B phase
is realized near the boundary. This implies that the influence of the wall or,
speaking in general, of any confined geometry does not lead to the existence of a
new phase near the boundary, but the wall deforms the order parameter of the B
phase and this deformation leads to some important consequences.
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