Two-stage melting of the vortex glass with strong point disorder

Sugano, Ryoko; Onogi, T.; Hirata, Kazuto

doi:10.1016/s0921-4534(00)00809-1

Cited by 5 publications

(7 citation statements)

References 4 publications

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“…Our experimental BG lines obtained in three irradiated samples are summarized in figure 10. A similar vortex phase diagram has recently been derived from numerical simulations using the Monte Carlo method [44]. Figure 10 shows strong evidence for the existence of the temperature interval [T = 0.72 T c , T = 0.83 T c ], where the BG melting lines for three irradiated samples can be scaled on top of each other.…”

Section: Vortex Phase Diagramsupporting

confidence: 70%

Vortex dynamics and phase diagram of BSCCO in the presence of columnar defects

Ammor¹,

Sousa²,

Soret³

et al. 2000

J. Phys.: Condens. Matter

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Section: Vortex Phase Diagramsupporting

confidence: 70%

Vortex dynamics and phase diagram of BSCCO in the presence of columnar defects

Ammor¹,

Sousa²,

Soret³

et al. 2000

J. Phys.: Condens. Matter

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“…The signature of this Bose-glass-to-vortexliquid transition is a universal scaling of current-voltage characteristics with well-defined critical exponents. This has been verified in several experiments [2,3] as well as in numerical simulations [4], for highly anisotropic Bi 2 Sr 2 CaCu 2 O 8+δ (BSCCO) and weakly anisotropic YBa 2 Cu 3 O 7−δ (YBCO) compounds. The main difference between these two systems is the different anisotropy factor γ = (m c /m ab ) 1/2 > 1, where m c and m ab are the effective masses of electrons moving along the c-axis and the ab-plane, respectively.…”

supporting

confidence: 67%

Critical current-voltage scaling of heavy-ion–irradiated Bi ₂ Sr ₂ CaCu ₂ O _{8 + δ} and (K,Ba)BiO ₃ superconductors

et al. 2004

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Current-voltage characteristics were investigated in highly anisotropic Bi2Sr2CaCu2O8 + δ, Bi1.8Pb0.2Sr2CaCu2O8 + δ and isotropic (K,Ba)BiO3 single crystals which were irradiated in the direction parallel to the c-axis. In the range of magnetic fields from Bϕ/10 to Bϕ (where Bϕ is the matching field), same scaling functions can be used to describe the transition in those two systems. The field- and sample-independent critical exponents, which were found to be ν⊥ = 1.1 ± 0.1, z = 5.3 ± 0.2 using α( ≡ ν∥/ν⊥) = 2, are in a very good agreement with numerical simulations for strongly screened vortex line interactions. Moreover, the obtained scalings are the same despite a large difference in anisotropy.

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“…Results of experiments argue in favor of the existence of a true phase transition in the high- field vortex state from a low-temperature superconducting vortex glass (ice) phase into a disordered high-temperature vortex fluid phase. Pinning of vortices due to impurities or other defects destroys the long-range correlations of the vortex lattice, probably replacing it with a new vortex-glass (ice) phase that has spin-glass (ice-like off-diagonal longrange order and true superconducting) [56]. Also, a disorderinduced transition was found from the three-dimensional Bragg glass (ice) to a quasi-two-dimensional vortex glass (ice), accompanied by an abrupt change of the interlayer coherence with increasing field.…”

Section: Electromagnetic Separationmentioning

confidence: 99%

“…2-12 ). Turnon of a magnetic field moves up a sample into the next form of SC-films, preliminary cooled to T < T c in a status of a "superconducting glass (ice)," which, as well as usual frustration spin glass (ice), when pseudo-backed, should choose between two orientations, and thus this state of sample is metastable [1,53,[55][56][57][58][59].…”

Section: Electromagnetic Separationmentioning

confidence: 99%

“…It is assumed that the inter-grain resistance in ceramic YBa 2 Cu 3 O x (5 % Ag), that prevents a high I cr from reducing by the presence of silver in granular spaces of the sample. Knowing how the vortexes move and arrange themselves under various conditions, such as temperature, magnetic field, stress-effects, and doping agent (Ag), and how these phenomena are influenced by the physical properties of the material will be critical in controlling the flux motion and maintaining the super current flow in these materials [13,18,22,23,53,[56][57][58][59].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantum Phase Transition in HTSC Thick Films: YBa2Cu3O x , YBa2Cu3O x (5 % Ag-Doped) in a Strong Pulsed Magnetic Field up to 32 T at Low Temperatures (58–100 K), Current Densities and Stress-Effect

Broide

Yakunin

2012

J Supercond Nov Magn

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We have researched the influence of pulsed magnetic fields up to 32 T on the magneto-resistance of thick films (50 Mk) of YBa 2 Cu 3 O x and YBa 2 Cu 3 O x (5 % Ag-doped) that were produced from synthesized powders. (Figs. 1-9): concentrate with 6.85-6.9 % O 2 and a tail fraction 6.5-6.6 % O 2 .We observed a linear plot at currents of more than 1 mA at 77 K in YBa 2 Cu 3 O x (5 % Ag-doped) at B > 5 T and in the concentrate YBa 2 Cu 3 O x samples with I = 1 mA, T = 68.2 K. Pulsed magnetic fields up to 32 T, at I = 1 mA had practically no influence on the value of the magnetoresistance in the concentrate YBa 2 Cu 3 O x specimens at T = 57.9 K and up to 17 T for YBa 2 Cu 3 O x (5 % Ag) at 77 K (Meissner effect). However, for B > 17 T, YBa 2 Cu 3 O x (5 % Ag) at 77 K demonstrates a tendency toward lower resistance.In the presence to 10 pulses in a cyclic pulsed magnetic field of 32 T, there is a sharp change of magnetic properties of an HTSC that can lead to nontrivial changes in the transition temperature, due to the strong mechanic stresses, sharp change value structure, and because one of the phases becomes superconducting (Figs. 3A, 3B). The behavior of the magnetoresistance of S-N-S contacts in pulsed magnetic Analysis of microscopic models of quantum phase transitions was made in a granular superconductor in an attempt to explain the results on the studied HTSC-films and to give a physical interpretation to the deduced parameters of some experiments on the basis of "spin (vortex) glass" (vortex ice).

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Two-stage melting of the vortex glass with strong point disorder

Cited by 5 publications

References 4 publications

Vortex dynamics and phase diagram of BSCCO in the presence of columnar defects

Vortex dynamics and phase diagram of BSCCO in the presence of columnar defects

Critical current-voltage scaling of heavy-ion–irradiated Bi ₂ Sr ₂ CaCu ₂ O _{8 + δ} and (K,Ba)BiO ₃ superconductors

Quantum Phase Transition in HTSC Thick Films: YBa2Cu3O x , YBa2Cu3O x (5 % Ag-Doped) in a Strong Pulsed Magnetic Field up to 32 T at Low Temperatures (58–100 K), Current Densities and Stress-Effect

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Two-stage melting of the vortex glass with strong point disorder

Cited by 5 publications

References 4 publications

Vortex dynamics and phase diagram of BSCCO in the presence of columnar defects

Vortex dynamics and phase diagram of BSCCO in the presence of columnar defects

Critical current-voltage scaling of heavy-ion–irradiated Bi 2 Sr 2 CaCu 2 O 8 + δ and (K,Ba)BiO 3 superconductors

Quantum Phase Transition in HTSC Thick Films: YBa2Cu3O x , YBa2Cu3O x (5 % Ag-Doped) in a Strong Pulsed Magnetic Field up to 32 T at Low Temperatures (58–100 K), Current Densities and Stress-Effect

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Critical current-voltage scaling of heavy-ion–irradiated Bi ₂ Sr ₂ CaCu ₂ O _{8 + δ} and (K,Ba)BiO ₃ superconductors