Nonhydrodynamic spin transport in superfluid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Bunkov, Yu. M.; Дмитриев, В. В.; Маркелов, А. В.; Mukharskii, Yu. M.; Einzel, Dietrich

doi:10.1103/physrevlett.65.867

Cited by 42 publications

(23 citation statements)

References 14 publications

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“…(108) in Ref. [20], is complicated, but describes the measured values well [23,19]. An alternative calculation of D for all temperatures is found in Ref.…”

Section: Magnon Bec Thermometrymentioning

confidence: 99%

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Microkelvin Thermometry with Bose–Einstein Condensates of Magnons and Applications to Studies of the AB Interface in Superfluid $$^3$$ 3 He

et al. 2014

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Coherent precession of trapped Bose-Einstein condensates of magnons is a sensitive probe for magnetic relaxation processes in superfluid 3 He-B down to the lowest achievable temperatures. We use the dependence of the relaxation rate on the density of thermal quasiparticles to implement thermometry in 3 He-B at temperatures below 300 µK. Unlike popular vibrating wire or quartz tuning fork based thermometers, magnon condensates allow for contactless temperature measurement and make possible an independent in situ determination of the residual zero-temperature relaxation provided by the radiation damping. We use this magnon-condensate-based thermometry to study the thermal impedance of the interface between A and B phases of superfluid 3 He. The magnon condensate is also a sensitive probe of the orbital order-parameter texture. This has allowed us to observe for the first time the non-thermal signature of the annihilation of two AB interfaces.

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“…(108) in Ref. [20], is complicated, but describes the measured values well [23,19]. An alternative calculation of D for all temperatures is found in Ref.…”

Section: Magnon Bec Thermometrymentioning

confidence: 99%

“…The central property of the spin transport in this regime [21,22,23,24] is the Leggett-Rice effect associated with the existence of the Landau molecular field. As a result, the effective spin diffusion coefficient D acquires a fast temperature dependence similar to the damping of the oscillating object, D ∝ exp(−∆/k B T ) (see appendix).…”

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confidence: 99%

Microkelvin Thermometry with Bose–Einstein Condensates of Magnons and Applications to Studies of the AB Interface in Superfluid $$^3$$ 3 He

et al. 2014

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“…Values extracted from the measurements in Fig. 4 at Imin = 0.25 A (red circles) and from similar measurements at P = 15.5 bar and Imin = 2 A (blue circles) are compared to the theoretical prediction [17] (lines) and to the measurements at higher temperatures [10] (squares). Note that the measurements are done at different frequencies while, according to the theory, D is approximately inversely proportional to fL [17].…”

Section: Relaxation Measurementsmentioning

confidence: 99%

“…If part of the sample is not involved in the precession, it is separated from the HPD by a relatively thin boundary where the tipping angle of magnetization rapidly changes. In the absence of pumping the HPD decays owing to the Leggett-Takagi relaxation originating from the coupling of spins of the normal and superfluid components, and owing to the spin diffusion through the boundary [10]. Additionally, at temperatures below about 0.4T c the HPD experiences highly accelerated decay known as "catastrophic relaxation" owing to the Suhl type instability [11].…”

Section: Introductionmentioning

confidence: 99%

Relaxation of Bose-Einstein Condensates of Magnons in Magneto-Textural Traps in Superfluid 3He-B

et al. 2013

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In superfluid3 He-B externally pumped quantized spin-wave excitations or magnons spontaneously form a Bose-Einstein condensate in a 3-dimensional trap created with the order-parameter texture and a shallow minimum in the polarizing field. The condensation is manifested by coherent precession of the magnetization with a common frequency in a large volume. The trap shape is controlled by the profile of the applied magnetic field and by the condensate itself via the spin-orbit interaction. The trapping potential can be experimentally determined with the spectroscopy of the magnon levels in the trap. We have measured the decay of the ground state condensates after switching off the pumping in the temperature range (0.14 ÷ 0.2)T c . Two contributions to the relaxation are identified: (1) spin diffusion with the diffusion coefficient proportional to the density of thermal quasiparticles and (2) the approximately temperature-independent radiation damping caused by the losses in the NMR pick-up circuit. The measured dependence of the relaxation on the shape of the trapping potential is in a good agreement with our calculations based on the magnetic field profile and the magnon-modified texture. Our values for the spin diffusion coefficient at low temperatures agree with the theoretical prediction and earlier measurements at temperatures above 0.5T c .

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“…1(b) of Ref. [12] we extract the approximate values τ LT ≈ 0.07 µs at T = 0.6T c and τ LT ≈ 0.035 µs at T = 0.5T c . The numerical values of the parameters needed in Eq.…”

Section: Leggett-takagi Relaxationmentioning

confidence: 99%

Calculation of Leggett–Takagi Relaxation in Vortices of Superfluid $$^{3}$$ 3 He-B

Laine

Thuneberg

2016

J Low Temp Phys

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We calculate the relaxation of Brinkman-Smith mode via Leggett-Takagi relaxation in the presence of an isolated vortex in superfluid 3 He-B. The calculation is based on an analytical solution of the order parameter far from the vortex axis. We obtain an expression for the dissipated power per vortex length as a function of the tipping angle of the magnetization and the orientation of the static magnetic field with respect to the vortex.

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Nonhydrodynamic spin transport in superfluidHe3

Cited by 42 publications

References 14 publications

Microkelvin Thermometry with Bose–Einstein Condensates of Magnons and Applications to Studies of the AB Interface in Superfluid $$^3$$ 3 He

Microkelvin Thermometry with Bose–Einstein Condensates of Magnons and Applications to Studies of the AB Interface in Superfluid $$^3$$ 3 He

Relaxation of Bose-Einstein Condensates of Magnons in Magneto-Textural Traps in Superfluid 3He-B

Calculation of Leggett–Takagi Relaxation in Vortices of Superfluid $$^{3}$$ 3 He-B

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