Dynamic and Thermodynamic Properties of Porous Vortex Matter in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>Ca</mml:mi><mml:msub><mml:mi>Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:math>in an Oblique Magnetic Field

Avraham, Nurit; Goldschmidt, Yadin Y.; Liu, Jintao; Myasoedov, Y.; Rappaport, Michael; Zeldov, E.; Beek, C.J. van der; Kończykowski, M.; Tamegai, T.

doi:10.1103/physrevlett.99.087001

Cited by 18 publications

(27 citation statements)

References 34 publications

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“…The results indicated that such changes were perceived only for magnetic fields applied to angles higher than 40 • . In addition to this, we also argue that recent magneto-optical measurements and molecular dynamics simulations in Bi 2 Sr 2 CaCu 2 O 8 with columnar defects give support to our estimates of c L [34]. It was found that the dynamics properties of porous vortex matter are very sensitive to the angle between the applied magnetic field and the columnar defects.…”

Section: Resultssupporting

confidence: 72%

Flux-Line-Lattice Melting and Upper Critical Field of Bi1.65Pb0.35Sr2Ca2Cu3O10+δ Ceramic Samples

Govea-Alcaide

Muné

Jardim

2011

J Supercond Nov Magn

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We have conducted magnetoresistance measurements ρ (T , H ) in applied magnetic fields up to 18 T in Bi 1.65 Pb 0.35 Sr 2 Ca 2 Cu 3 O 10+δ ceramic samples which were subjected to different uniaxial compacting pressures. The anisotropic upper critical fields H c2 (T ) were extracted from the ρ(T , H ) data, yielding H ab c2 (0) ∼ 130 T and the out-ofplane superconducting coherence length ξ c (0) ∼ 3 Å. We have also estimated H c c2 (0) ∼ 4.4 T and ξ ab (0) ∼90 Å. In addition to this, a flux-line-lattice (FLL) melting temperature T m has been identified as a second peak in the derivative of the magnetoresistance dρ/dT data close to the superconducting transition temperature. An H m vs. T phase diagram was constructed and the FLL boundary lines were found to obey a temperature dependence H m ∝ (T c /T − 1) α , where α ∼ 2 for the sample subjected to the higher compacting pressure. A reasonable value of the Lindemann parameter c L ∼ 0.29 has been found for all samples studied.

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Section: Resultssupporting

confidence: 72%

Flux-Line-Lattice Melting and Upper Critical Field of Bi1.65Pb0.35Sr2Ca2Cu3O10+δ Ceramic Samples

Govea-Alcaide

Muné

Jardim

2011

J Supercond Nov Magn

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“…This can be expected from the same theory [21] assuming that the main pinning site in n-films is dislocation cores or twin planes. Therefore, the thing we need to explain is why is so much lower than for the BZO-doped samples.…”

Section: Matching Fieldmentioning

confidence: 54%

“…According to the theory [21] above the matching field the vortices in between the pinning sites form a porous vortex solid at low temperatures, which at high temperature melts to a nanoliquid phase where the vortices are weakly pinned between the columnar pinning sites. This melting changes the angular dependency of to more isotropic, i.e.…”

Section: Matching Fieldmentioning

confidence: 99%

Defining $B_{c}$, $B^{\ast}$ and $B_{\phi}$ for YBCO Thin Films

Paturi

Irjala

Abrahamsen

et al. 2009

IEEE Trans. Appl. Supercond.

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Abstract-The accommodation field,, is generally defined to be the field at which the cross over from single vortex pinning to collective pinning occurs. It is determined from magnetization curves as the point where the c plateau ends and it used as a convenient way of comparing the pinning properties of superconducting films. Similarly, the characteristic field, , can be obtained from magneto-optical (MO) images from when the flux fronts meet in the middle of the film. The matching field, , at which there is one vortex line per pinning site, is sometimes thought to be the same as , but in BaZrO 3 -doped YBa 2 Cu 3 O 7 films the calculated is much higher than the observed . can be determined from angular dependent transport measurements. All of the field values correspond to some special case in the flux pinning in the film and relate to c . In this work we have determined , and for different kinds of YBCO films using MO, magnetization and transport measurements to reveal the deeper meaning of the special fields.

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“…The temperature at which the inhomogeneous VL (called "vortex nanoliquid" in Ref. 14) crosses over to the depinned, homogeneous liquid was also found to be independent of θ for a fixed value of H z . The simulations were performed for a fixed number density of pancake vortices on the layers (fixed B z ) and different orientations of the columnar pins, keeping the number density of pinning centers on each layer fixed at a value lower than that of pancake vortices.…”

Section: Introductionmentioning

confidence: 99%

“…The behavior of vortex systems with tilted columnar pinning and B > B φ (c < 1) has been investigated recently in experiments 14 and simulations 14,15 . The experiments were performed on a sample of Bi 2 Sr 2 CaCu 2 O 8 (BSCCO) with a small concentration of random columnar pins tilted at an angle of 45…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of vortex matter in layered superconductors with tilted columnar pinning centers

Dasgupta

Valls

2009

Phys. Rev. B

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We study the vortex matter phase diagram of a layered superconductor in the presence of columnar pinning defects, tilted with respect to the normal to the layers. We use numerical minimization of the free energy written as a functional of the time averaged vortex density of the Ramakrishnan-Yussouff form, supplemented by the appropriate pinning potential. We study the case where the pin density is smaller than the areal vortex density. At lower pin concentrations, we find, for temperatures of the order of the melting temperature of the unpinned lattice, a Bose glass type phase which at lower temperatures converts, via a first order transition, to a Bragg glass, while, at higher temperatures, it crosses over to an interstitial liquid. At somewhat higher concentrations, no transition to a Bragg glass is found even at the lowest temperatures studied. While qualitatively the behavior we find is similar to that obtained using the same procedures for columnar pins normal to the layers, there are important and observable quantitative differences, which we discuss.

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Dynamic and Thermodynamic Properties of Porous Vortex Matter inBi2Sr2CaCu2O8in an Oblique Magnetic Field

Cited by 18 publications

References 34 publications

Flux-Line-Lattice Melting and Upper Critical Field of Bi1.65Pb0.35Sr2Ca2Cu3O10+δ Ceramic Samples

Flux-Line-Lattice Melting and Upper Critical Field of Bi1.65Pb0.35Sr2Ca2Cu3O10+δ Ceramic Samples

Defining $B_{c}$, $B^{\ast}$ and $B_{\phi}$ for YBCO Thin Films

Phase diagram of vortex matter in layered superconductors with tilted columnar pinning centers

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