On the nature of the γ-α transition in cerium

Éliashberg, G. M.; Capellmann, H.

doi:10.1134/1.567644

Cited by 48 publications

(46 citation statements)

References 13 publications

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“…The most fascinating result is that this nonequilibrium population causes the coherent part of Y to decay (at given τ in ) slowly, as E T h /T, at T E T h , whereas the equilibrium supercurrent decays exponentially, as ∝ exp (−L/L T ). This non-equilibrium enhancement of the superconducting correlations recalls the well known effect of the microwaves enhancement of superconductivity, the phenomena, known as the DayemWyatt effect [12][13][14] , which is observed in microbridges, thin films and stripes [15][16][17][18][19] . Similar effect exist in the hybrid structures 20,21 , but their physics is enriched by existence of two different time scales: time of diffusion along the normal part τ D and inelastic scattering rate τ in , as was clearly demonstrated recently 22 .…”

Section: Introductionmentioning

confidence: 99%

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Admittance of a long diffusive SNS junction

Tikhonov

Фейгельман

2015

Phys. Rev. B

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The dynamical properties of hybrid normal metal/superconductor structures have recently come into research focus both experimentally and theoretically. Recent experimental studies of the coherent admittance Y (ω) of SNS rings as function of the phase difference φ0 are still not fully understood. Here we concentrate on the linear response regime, calculating Y (ω) by solving Usadel equations, linearised in electric field. Although partially reproducing previously known results, we find qualitatively different behaviour in the collisionless regime of τ −1 in ω E T h and high temperature T E T h and low temperature T E T h near the minigap closing φ0 ∼ π. We find that the dissipative part ReY (ω) peaks when the minigap closes (at a phase difference of π) even at high temperatures, when the equilibrium supercurrent is fully suppressed.

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Section: Introductionmentioning

confidence: 99%

“…Here we present expressions for transport coefficients at non-zero frequency, which enter Eqs (14), (15). Energy/charge diffusion coefficients read:…”

mentioning

confidence: 99%

Admittance of a long diffusive SNS junction

Tikhonov

Фейгельман

2015

Phys. Rev. B

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“…First of all, there is a dynamic suppression of the order parameter modulus ψ by the effective mean square of the field amplitude ( ) Besides that, there is a kinetic effect of the field better known as the Eliashberg mechanism [1][2][3]. This phenomenon is related to the redistribution of electrons and holes in momentum space and releasing states at the Fermi level near the energy gap caused by the absorption of photons of the electromagnetic fields with the frequencies lying in the range determined by the energy gap in the spectrum and a certain parameter describing the electron energy.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of the resistive state of a narrow superconducting channel in the ac voltage driven regime

Yerin

Fenchenko

2013

Low Temperature Physics

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Within the framework of the time-dependent Ginzburg-Landau equations, the dynamics of the order parameter in narrow superconducting channels of different lengths is investigated in the ac voltage-driven regime. The resistive state of the system at low frequencies of the applied voltage is characterized by the formation of time-periodic groups of oscillating phase-slip centers (PSCs). Increasing the frequency reduces the lifetime of these periodic groups. Depending on the length of the channel, the ac voltage either tends to restore the state with a single central PSC in periodic groups or minimizes the number of forming PSCs and induces their ordering in the system. For relatively short channels, a further increase in frequency leads to the suppression of the order parameter without PCS formation. For the systems with the channel length exceeding the specified limit, the formation of PSC starts after a certain time delay which increases rapidly with frequency. The current-voltage characteristics of a relatively short channel at different applied voltage frequencies are calculated. It is found that the current-voltage characteristics exhibit a step-like structure, where the height of the first step is determined by the quadruple value of the Josephson frequency.

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“…Study of non-equilibrium effects in superconducting hetero-structures as well as in homogeneous superconductors in the presence of optical or microwaves radiations has been carried out during a long time (see reviews [10,11,12] and references therein). For example, Eliashberg suggested to stimulate superconductivity by a microwave radiation that leads to an essential deviation of the distribution function f from the equilibrium one [13]. As the energy gap ∆ in S is related to the function f via the self-consistancy equation, the energy gap and the critical temperature may increase in the presence of a microwave radiation, which results in an increase of the critical current [14].…”

Section: Introductionmentioning

confidence: 99%

Inhomogeneous state in nonequilibrium superconductor/normal-metal tunnel structures: A Larkin-Ovchinnikov-Fulde-Ferrell-like phase for nonmagnetic systems

2009

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We analyze non-equilibrium states in a tunnel superconductor-normal metal (N/S/N) structure in the presence of a tunnel current I. We use an approximation of an effective temperature T and calculate the current-voltage I-V characteristics. It is shown that the I-V dependence may have an Sshaped form. We determine nonuniform current I(x) and temperature T (x) distributions that arise as a result of instability of the uniform state with negative differential conductance (dI/dV < 0). We discuss an analogy with equilibrium superconductors with an exchange field in which nonuniform states predicted by Larkin/Ovchinnikov and Fulde/Ferrell are possible.

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On the nature of the γ-α transition in cerium

Cited by 48 publications

References 13 publications

Admittance of a long diffusive SNS junction

Admittance of a long diffusive SNS junction

Dynamics of the resistive state of a narrow superconducting channel in the ac voltage driven regime

Inhomogeneous state in nonequilibrium superconductor/normal-metal tunnel structures: A Larkin-Ovchinnikov-Fulde-Ferrell-like phase for nonmagnetic systems

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