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Pissas, M.; Moraitakis, E.; Kallias, G.; Bondarenko, A. V.

doi:10.1103/physrevb.62.1446

Cited by 30 publications

(25 citation statements)

References 67 publications

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“…They proposed that for H < H * (T ) the response of vortex system was elastic, while for H > H * (T ) the increase of S (decrease of U o ) should be caused by plastic deformations of the vortex solid [7]. Since then, many experimental works confirmed this notion in YBa [4,6,10,11,18,19]. More specifically, in high-T c compounds for fields H > H * (T ) the activation energy U o follows a negative power-law U o ∝ H ν with ν ∈ [−0.5, −0.9] [7,10,13,18,19].…”

Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 51%

“…As a result the magnetic curves are more regular. The overall behavior resembles the SMP observed usually in high-T c superconductors [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. For this reason we "loosely" refer to these characteristic fields as H′′ smp ′′ .…”

Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 99%

“…Recent magnetic studies in Nb films [1,2,3] reported the existence of a structure that reminisces of the second magnetization peak (SMP) which is usually observed in high-T c superconductors [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. These studies concluded that for the case of Nb films the "SMP" is probably motivated by thermomagnetic instabilities (TMIs) that occur in the low-temperature regime, far below the uppercritical field [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

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Relaxation measurements in the regime of the second magnetization peak in Nb films

Σταμόπουλος¹,

Niarchos²

2004

Physica C: Superconductivity

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We report on magnetic measurements as a function of field, temperature and time (relaxation) in superconducting Nb films of critical temperature Tc = 9.25 K. The magnetic measurements as a function of field exhibited a "second magnetization peak" ("SMP") which in general is accompanied by thermomagnetic instabilities (TMIs). The lines H′′ smp ′′ (T ) where the "SMP" occurs and the H fj (T ) where the first flux jump in the virgin magnetization curves is observed, end at a characteristic point (To, Ho) ≈ (7.2 K,80 Oe). Relaxation measurements showed that for T < To ≈ 7.2 K the activation energy Uo and the normalized relaxation rate S exhibit non-monotonic behavior as a function either of temperature or field. The extrema observed in Uo and S coincide with the points Hon(T ) or H′′ smp ′′ (T ) of the "SMP". In the regime T > To ≈ 7.2 K both Uo and S present a conventional monotonic behavior. These results indicate that the "SMP" behavior observed in our Nb films is promoted by the anomalous relaxation of the magnetization.

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Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 51%

Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Relaxation measurements in the regime of the second magnetization peak in Nb films

Σταμόπουλος¹,

Niarchos²

2004

Physica C: Superconductivity

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“…11 and 12͒ or the inflection point between H ON and H SP located at H INF . [13][14][15][16] In the case of moderately doped Bi2212 and Bi2223 the second-peak maximum H SP is roughly temperature independent. 10,17,18 In this work we report that, unexpectedly, in Bi2201 the second-peak effect strongly depends on temperature.…”

Section: Introductionmentioning

confidence: 95%

Vortex phase diagram and temperature-dependent second-peak effect in overdopedBi2Sr2CuO6+δcrystals

et al. 2010

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We study the vortex phase diagram of the single-layer Bi 2 Sr 2 CuO 6+␦ ͑Bi2201͒ superconductor by means of bulk magnetization measurements on high-quality oxygen-overdoped crystals. In striking contrast with the results found in the moderately doped two-and three-layer Bi-based cuprates, Bi2201 exhibits a strong temperature-dependent second-peak effect. By means of measurements of the in-plane and out-of-plane firstpenetration field we provide direct evidence that this phenomenon is mainly associated to an increase in the electromagnetic anisotropy on warming. The effect of oxygen-doping ␦ on the vortex phase diagram results in both the irreversibility and second-peak lines shifting to higher temperatures and fields. This enhanced stability of the Bragg glass phase suggests that the interlayer coupling between Cu-O layers increases with ␦. In addition, we found that the critical temperature follows the parabolic relation with the number of holes per Cu-O plane that holds for most single-and two-layer cuprates.

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“…Nonmonotonous field variation of the pinning force F H p ( ), which is observed in the low-T c (NbSe 2 [1][2][3], MoGe [3], and V 3 Si [4]), middle-T c (MgB 2 [5,6]), and high-T c (BiSrCaCuO [7], YBaCuO [8,9]) superconductors, is a subject of long-time interest. Several models were proposed to explain this phenomenon.…”

mentioning

confidence: 99%

Creep and depinning of vortices in a nontwinned YBa2Cu3O6.87 single crystal

Bondarenko

Zavgorodniy

Lotnik

et al. 2008

Low Temperature Physics

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We present the results of transport study of vortex dynamics in YBa 2 Cu 3 O 6.87 crystals in the magnetic field H||c. In low magnetic fields, H < 4 kOe, the measurements were performed in the range of vortex velocities n = -10 4 -2 m/s, which covers thermal creep and flux flow modes. The pinning force F p nonmonotonically depends on magnetic field in both modes, though low-field minimum in the F H p ( ) curve shifts to higher fields with increased velocity n, that is interpreted as partial ordering the vortex lattice. The increase of the pinning force F p upon increasing the field, which is observed in the flux flow mode in fields H ³ 3 kOe, is interpreted by presence of finite transverse barriers. The barriers result in preserving the entangled vortex solid phase for the above-barrier vortex motion along the action of the Lorentz force. We also show that field variation of the depinning current has a single maximum, while field variation of the pinning force inside deep creep mode has two maxima. Appearance of two maxima is associated with nonmonotonous field variation of the activation energy U pl , which corresponds to plastic vortex creep mediated by motion of the dislocations. [12]. Two alternative explanations [13,14] predict transformation of an ordered vortex solid (VS) phase, which forms in low fields and is characterized by a decrease of the force F p with increased field, to a disordered VS phase, which forms in high fields and is characterized by increase of the force F p with the field. These models are supported by correlation between the field H OD corresponded to an ordering in the VS structure [15] and onset of the F p increase [7] in BiCaSrCuO crystals. It should be noted that the «Lindemann criteria model» [13] predicts gradual transition from the topologically ordered VS to topologically disordered VS, which imply gradual crossover from the decreased to increased branch of the F H p ( ) dependence. In contrast, the quantitative theory proposed in Ref. 14 predicts real phase transition from the vortex-lattice state to the vortex-glass state, which is accompanied by sharp increase in the depinning current. Therefore these two models can be dis-

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Onset of the fishtail peak in an untwinnedYBa2Cu3O7

Cited by 30 publications

References 67 publications

Relaxation measurements in the regime of the second magnetization peak in Nb films

Relaxation measurements in the regime of the second magnetization peak in Nb films

Vortex phase diagram and temperature-dependent second-peak effect in overdopedBi2Sr2CuO6+δcrystals

Creep and depinning of vortices in a nontwinned YBa2Cu3O6.87 single crystal

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