Flux motion and phase transitions in superconducting (K,Ba)Bi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>single crystals

Klein, Thierry; Baril, L.; Escribe-Filippini, C.; Marcus, J.; Jansen, A. G. M.

doi:10.1103/physrevb.53.9337

Cited by 21 publications

(7 citation statements)

References 39 publications

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“…1, close to T c , the second maximum peak H p (T ) in the magnetization curves varies roughly linearly with H g whereas it becomes almost temperature independent at lower temperature (saturating around 3 T). A very similar temperature dependence of both the irreversibility line and the second maximum peak has also been observed close to T c in YBaCuO samples [7], [13] suggesting that those two phenomena may actually be related to each other close to T c . However, at low temperature H p is almost temperature independent, whereas H g still increases sharply as T tends towards zero.…”

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confidence: 54%

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Relaxation and anomalous T - and H -dependence of the μ coefficient in (K,Ba)BiO ₃ superconductors

Klein¹,

Harneit²,

Joumard³

et al. 1998

Europhys. Lett.

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Ac shielding and classical dc relaxation experiments have been used to study the flux creep phenomena in the cubic (K, Ba)BiO3 superconductor (Tc ∼ 30 K). The relaxation rate is found to be constant (S ∼ 1.5%) at low temperature and magnetic field and increases sharply as the vortex-glass transition line is approached. This behavior can be attributed to an anomalous decrease of the µ exponent (U (J) = U0(J0/J) µ ) close to Tg(H). In this regime, the temperature dependence of the apparent critical current J is then directly related to µ(T ) as J(T ) = J0/[kT /U0 • ln(1/ωτ )] µ(T ) . A similar analysis can be made on the J(B) data recently published by Abulafia et al. (Phys. Rev. Lett., 77 (1996) 1597) on YBaCuO single crystals.

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confidence: 54%

“…[12]. We have shown in a previous paper [13] that this system presents a vortex glass-to-liquid transition and the corresponding transition field (H g (T )) has been deduced by fitting the foot of resistive transition curves by a (H − H g (T )) β formula. As shown in fig.…”

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confidence: 97%

Relaxation and anomalous T - and H -dependence of the μ coefficient in (K,Ba)BiO ₃ superconductors

Klein¹,

Harneit²,

Joumard³

et al. 1998

Europhys. Lett.

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“…B sb and B lb are reported on the nonequilibrium H-T phase diagram of fig. 3, together with the vortex-glass transition (H g (T )) and upper critical (H c2 ) fields deduced from our transport measurements [11]. H g and H c2 delimit the vortex liquid phase and below H g (T ) the vortices are in the solid (i.e.…”

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confidence: 52%

Evidence for collective δ T _c pinning in superconducting (K,Ba)BiO ₃ single crystals

et al. 1996

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The nature of pinning has been investigated in the three-dimensional high-Tc superconductor (K,Ba)BiO3. We show that the magnetic-field dependence of the critical current deduced from pulsed-field magnetization measurements can be well described by the collective-pinning theory on a large temperature range 0.06 < T/Tc < 0.62. This permits us to construct a nonequilibrium H-T phase diagram including both the single-vortex and vortex bundle regimes. Furthermore, the temperature dependence of the collective-pinning length Lc is in excellent agreement with a model of flux pinning induced by spatial fluctuations of the critical temperature (δTc pinning model).

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“…Recent experiments in the mixed state of high-T c superconductors have presented evidence for the existence of a second-order phase transition from a vortex-liquid to a vortex-glass phase for J→0, [1][2][3][4] where J is the applied current density. However, the evolution of the H-T phase diagram with increasing J still remains a controversial issue.…”

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Temperature, current, and magnetic-field dependence of the activation energy in the vortex-glass phase of (K,Ba)BiO3single crystals

et al. 1996

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We have investigated the vortex dynamics of ͑K,Ba͒BiO 3 single crystals below the vortex liquid/glass transition. The activation energy U extracted from transport measurements presents a crossover from a J Ϫ(T) to a ln(J) behavior. The latter expression has been attributed to the existence of a glass transition regime which extends over a large part of the J-T phase diagram. We show that the temperature dependence of U lies entirely in (T): close to transition, the vortex glass structure is prevailing (→0.2), but becomes negligible at low temperature where creep effects may be controlled by the elastic properties of the vortex lattice (→1). The magnetic-field dependence of U is also discussed.

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Flux motion and phase transitions in superconducting (K,Ba)BiO3single crystals

Cited by 21 publications

References 39 publications

Relaxation and anomalous T - and H -dependence of the μ coefficient in (K,Ba)BiO ₃ superconductors

Relaxation and anomalous T - and H -dependence of the μ coefficient in (K,Ba)BiO ₃ superconductors

Evidence for collective δ T _c pinning in superconducting (K,Ba)BiO ₃ single crystals

Temperature, current, and magnetic-field dependence of the activation energy in the vortex-glass phase of (K,Ba)BiO3single crystals

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Flux motion and phase transitions in superconducting (K,Ba)BiO3single crystals

Cited by 21 publications

References 39 publications

Relaxation and anomalous T - and H -dependence of the μ coefficient in (K,Ba)BiO 3 superconductors

Relaxation and anomalous T - and H -dependence of the μ coefficient in (K,Ba)BiO 3 superconductors

Evidence for collective δ T c pinning in superconducting (K,Ba)BiO 3 single crystals

Temperature, current, and magnetic-field dependence of the activation energy in the vortex-glass phase of (K,Ba)BiO3single crystals

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Product

Resources

About

Relaxation and anomalous T - and H -dependence of the μ coefficient in (K,Ba)BiO ₃ superconductors

Relaxation and anomalous T - and H -dependence of the μ coefficient in (K,Ba)BiO ₃ superconductors

Evidence for collective δ T _c pinning in superconducting (K,Ba)BiO ₃ single crystals