Interlayer Phase Coherence in the Vortex State of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>CaCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mm

Matsuda, Yuji; Gaifullin, Marat; Kumagai, K.; Kosugi, M.; Hirata, Kazuto

doi:10.1103/physrevlett.78.1972

Cited by 121 publications

(58 citation statements)

References 21 publications

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“…Similar effects have been exhibited in high T c supercondutors. For instance, Josephson plasma resonance experiments in Bi 2 Sr 2 CaCu 2 O 8 (BSCCO) suggest that the resonant field in FC samples is stationary while in ZFC samples it approaches the FC value asymptotically [10]. Still, thermomagnetic history effects in the solid vortex phase of pure twinned YBa 2 Cu 3 O 7 single crystals have been recently observed in ac susceptibility measurements [11].…”

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confidence: 99%

Slow relaxations and history dependence of the transport properties of layered superconductors

Exartier

Cugliandolo

2002

Phys. Rev. B

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We study numerically the time evolution of the transport properties of layered superconductors after different preparations. We show that, in accordance with recent experiments in Bi2Sr2CaCu2O8 performed in the second peak region of the phase diagram (Portier el al., 2001), the relaxation strongly depends on the initial conditions and is extremely slow. We investigate the dependence on the pinning center density and the perturbation applied. We compare the measurements to recent findings in tapped granular matter and we interpret our results with a rather simple picture.The behavior of the flux-line array in type II superconductors is determined by two competing interactions, the vortex-vortex repulsion that favors order in the form of a hexagonal lattice, and the attraction between vortices and randomly placed pinning centers due to material defects that, as thermal fluctuations, favors disorder. This competition generates a very rich static phase diagram [1]. More recently, the evolution of the spatial ordering of vortices driven out of equilibrium by, e.g., an external current has been analyzed analytically [2], numerically [3] and experimentally [4].However, even in the absence of an external force, vortex systems show very rich nonequilibrium phenomena. Indeed, a hallmark of vortex dynamics is its history dependence. A vortex structure prepared by zero-field cooling (ZFC), in which the magnetic field is applied right after crossing the transition temperature, is expected to be more ordered than the one prepared by field cooling (FC), in which the magnetic field is applied before going through the transition [5-7] (see, however, [8]). Subsequently, thermal fluctuations allow for the rearrangement of the initial configurations. Studies of the evolution after FC and ZFC preparations of low-T c and high-T c type II superconductors have been performed with a variety of techniques that we non exhaustively summarize below.The initial current ramp in the IV characteristic of a FC 2H-NbSe 2 sample has a large hysteretic critical value, suggesting that vortices are strongly pinned [6,7]. Once the flux lines are depinned, and one applies a subsequent ramp, the critical current takes a smaller value. In ZFC samples the critical current in both ramps is small [6]. The presence of metastability and hysteresis depends on the speed of the current ramp imposed to the system [9]. The ac response and complex resistivity in 2H-NbSe 2 also show that the FC state is strongly pinned and disordered while the ZFC state is not [7] [12], focusing on the effect of superheating or supercooling the ordered and disordered phases [13].In this Letter we concentrate on a recent study of the long-time transport properties of BSCCO monocrystals after different preparations [14]. The experimental protocol is as follows. The same working conditions, given by a temperature T = 4.5K and a magnetic field, µ o H = 1.5T , perpendicular to the c-axis are initially attained via a FC or a ZFC procedure. These values fall in the second peak region [6]. ...

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confidence: 99%

Slow relaxations and history dependence of the transport properties of layered superconductors

Exartier

Cugliandolo

2002

Phys. Rev. B

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“…As with other resonance methods, the Josephson plasma resonance is a sensitive and convenient tool for the study of the material properties [11][12][13][40][41][42][43][44][45][46]. Evidently, the JPR gives direct information about the Josephson coupling of the superconducting layers.…”

Section: Josephson Plasma Resonancementioning

confidence: 99%

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

et al. 2010

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The recent growing interest in terahertz (THz) and sub-THz science and technology is due to its many important applications in physics, astronomy, chemistry, biology, and medicine, including THz imaging, spectroscopy, tomography, medical diagnosis, health monitoring, environmental control, as well as chemical and biological identification. We review the problem of linear and nonlinear THz and sub-THz Josephson plasma waves in layered superconductors and their excitations produced by moving Josephson vortices. We start by discussing the coupled sine-Gordon equations for the gauge-invariant phase difference of the order parameter in the junctions, taking into account the effect of breaking the charge neutrality, and deriving the spectrum of Josephson plasma waves.We also review surface and waveguide Josephson plasma waves. The spectrum of these waves is presented, and their excitation is discussed. We review the propagation of weakly nonlinear Josephson plasma waves below the plasma frequency, ω J , which is very unusual for plasma-like excitations.In close analogy to nonlinear optics, these waves exhibit numerous remarkable features, including a self-focusing effect, and the pumping of weaker waves by a stronger one. In addition, an unusual stop-light phenomenon, when ∂ω/∂k ≈ 0, caused by both nonlinearity and dissipation, can be observed in the Josephson plasma waves. At frequencies above ω J , the current-phase nonlinearity can be used for transforming continuous sub-THz radiation into short, strongly amplified, pulses.We also present quantum effects in layered superconductors, specifically, the problem of quantum MQT -macroscopic quantum tunnelling.z-axis is directed across the layers; y-axis is directed along the magnetic field.4

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“…Josephson plasma resonance provides extremely useful data for identifying phases of vortex matter 13,14,15,16 . In particular a jump in the resonance frequency ω pl has shown 15,16 that the Josephson coupling is strongly modified at the second peak transition.…”

Section: Josephson Plasma Resonancementioning

confidence: 99%

“…The Josephson plasma resonance is a probe of the Josephson coupling 13,14 and can be used to probe the various phase transitions. Recent data on BSCCO has indeed shown a significant reduction in the resonance frequency at the second peak transition 15,16 .…”

Section: 6mentioning

confidence: 99%

Decoupling and depinning of flux lattices in disordered layered superconductors

Horovitz¹

2005

Phys. Rev. B

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Phase transitions of a flux lattice in layered superconductors with magnetic field perpendicular to the layers and in presence of disorder are studied. We find that disorder generates a random Josephson coupling between layers which leads to a Josephson glass (JG) phase at low temperatures; vanishing of the JG order identifies a depinning transition. We also find that disorder and thermal fluctuations lead to layer decoupling where the renormalized Josephson coupling vanishes. Near decoupling an anharmonic regime is found, where usual elasticity and the resulting Bragg glass are not valid. The depinning line crosses the decoupling line at a multicritical point, resulting in four transition lines. The phase diagram is consistent with the unusual data on Bi2Sr2CaCu2O8 such as the "second peak" and depinning transitions. The Josephson plasma frequency is evaluated in the various phases.

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Interlayer Phase Coherence in the Vortex State ofBi2Sr2CaCu2

Cited by 121 publications

References 21 publications

Slow relaxations and history dependence of the transport properties of layered superconductors

Slow relaxations and history dependence of the transport properties of layered superconductors

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

Decoupling and depinning of flux lattices in disordered layered superconductors

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