arXiv subjects

G. A. Baramidze

Publications and source records attributed to G. A. Baramidze.

4 recordsLinked to original sources

arXiv2010

NMR in Superfluid A-like Phase of $^3$He Confined in Globally Deformed Aerogel in Tilted Magnetic Field

NMR spectra in superfluid A-like phases confined in axially deformed aerogel in presence of a magnetic field inclined with respect to deformation axis is considered. The characteristic features of dipole frequency shift in axially compressed and axially stretched cases are compared. In particular, it is shown that in axially stretched aerogel environment the stability region of coherently spin precessing mode is rather narrow due to the U(1)LIM effect.

cond-mat.other↗

arXiv2006

Magnetic Field Dependence of $T_{AB}$ in Superfluid $^3He$

The magnetic field dependence of the $A\to B$ transition temperature $T_{AB}$ in the superfluid $^3He$ is reconsidered in order to take into account the linear-in-field contribution beyond the approximation used in Ref.[7]. In the high field region, where the quadratic-in-field contribution prevails, the well known answer is restored. On the other hand,it is pointed out that the Fermi liquid effects shift the observability of the linear-in-field region to rather low magnetic fields.

cond-mat.other↗

arXiv2006

On a "Robust" A-like State of $^3He$ in Aerogel

The orbitally isotropic Equal Spin Pairing (ESP) state has been proposed in Ref. [1] as a candidate of an A-like phase of superfluid $^3He$ in aerogel environment. In order to preserve an exact isotropy of the state in the presence of the magnetic field the condensate with equal values of the amplitudes $Δ_{\uparrow\uparrow}$ and $Δ_{\downarrow\downarrow}$ was adopted. Experimentally it is established that this version does not reproduce observed splitting asymmetry of ESP phase in aerogel under the action of an external magnetic field. Here we explore the behavior of the quasi-isotropic version of an axiplanar ESP phase with $Δ_{\uparrow\uparrow}\neq Δ_{\downarrow\downarrow}$ and show that for this state the splitting asymmetry ratio could be reconciled with experimental observations.

cond-mat.soft↗

arXiv2003

Temperature Width and Spin Structure of Superfluid 3He-A1 in Aerogel

The influence of spin-exchange scattering centers on the triplet Cooper pairing is considered to explore the behavior of superfluid 3He in high porosity aerogel containing 3He atoms localized at the surface of silica strands. The homogeneously located and isotropically scattering system of spin-polarized ``impurity'' centers is adopted as a simple model to investigate the contribution of spin-exchange scattering chanel for quasiparticles to the formation of non-unitary superfluid A1-phase in aerogel environment. It is demonstrated that an interference between the potential and exchange parts of quasiparticle scattering against spin-polarized ``impurity'' centers can change considerably the temperature width and the spin structure of A_{1}-phase in aerogel.

cond-mat.soft↗