Scaling behavior of the rf vortex penetration depth in an organic superconductor

Sridhar, S.; Maheswaran, Bala; Willemsen, Balam A.; Wu, Dong Ho; Haddon, R. C.

doi:10.1103/physrevlett.68.2220

Cited by 30 publications

(4 citation statements)

References 17 publications

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“…The applicability of these models has been validated in earlier experiments on a variety of crystals and films. [6][7][8][9] We have shown in Ref. 2 that the field induced changes in surface impedance of a superconducting thin film can be well described using a simple model of vortex dynamics and parameters which are consistent with measurements on YBCO single crystals, 7 with…”

Section: Methodssupporting

confidence: 60%

Critical-state flux penetration and linear microwave vortex response inYBa2Cu3O<

1997

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The vortex contribution to the dc magnetic field (H) dependence of the microwave surface impedance Z s (H)ϭR s (H)ϩiX s (H) of YBa 2 Cu 3 O 7Ϫ␦ thin films was measured using suspended patterned resonators. Z s (H) is shown to be a direct measure of the flux density B(H) enabling a very precise test of models of flux penetration. Three regimes of field-dependent behavior were observed: ͑1͒ Initial flux penetration occurs on very low-field scales H i ͑4.2 K͒ϳ10 mT, ͑2͒ at moderate fields the flux penetration into the virgin state is in excellent agreement with calculations based upon the field-induced Bean critical state for thin-film geometry, parametrized by a field scale H s (4.2 K)ϳJ c dϳ0.5 T, and ͑3͒ for very high fields HӷH s , the flux density is uniform and the measurements enable direct determination of vortex parameters such as pinning force constants ␣ p and vortex viscosity . However, hysteresis loops are in disagreement with the thin-film Bean model, and instead are governed by the low-field scale H i , rather than by H s . Geometric barriers are insufficient to account for the hysteresis loops.

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Section: Methodssupporting

confidence: 60%

Critical-state flux penetration and linear microwave vortex response inYBa2Cu3O<

1997

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“…In the vortex state and in the dilute limit of flux density, the rf penetration depth for periodic pinning potential can be written as [5],…”

Section: Methodsmentioning

confidence: 99%

Intergrain Connectivity and Resistive Broadening in Vortex State: A Comparison Between ${\rm MgB}_{2}$, ${\rm NbSe}_{2}$ and ${\rm Bi}_{2}{\rm Sr}_{2}{\rm Ca}_{2}{\rm Cu}_{3}{\rm O}_{10}$ Superconductors

Kaushik

Patnaik

2007

IEEE Trans. Appl. Supercond.

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-Magnetoresistance and radio frequency penetration depth techniques are used to study grain connectivity and broadening of superconducting transition. We study these issues in three different superconducting systems e.g. MgB 2 , NbSe 2 and Bi 2 Sr 2 Ca 2 Cu 3 O 10 . Some of the samples were irradiated with heavy ions. From the rf response, the bulk pinning force constant is evaluated. From high field transport measurements, H-T phase diagram is compared for the three systems with varying degrees of fluctuation and connectivity.

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“…In type II superconductors, a complex penetration depth ( λ) includes the normal skin depth (δ), the London penetration depth (λ L ), and the Campbell penetration depth (λ c ) [9,34,35]. As the applied field is increased the following occurs: the flux lattice is destroyed, λ L diverges at H c2 , and λ becomes limited by δ.…”

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confidence: 99%

Bulk two-dimensional Pauli-limited superconductor

et al. 2010

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We present a nearly perfect Pauli-limited critical field phase diagram for the anisotropic organic superconductor α-(ET)2NH4(SCN)4 when the applied magnetic field is oriented parallel to the conducting layers. The critical fields (Hc 2 ) were found by use of penetration depth measurements. Because Hc 2 is Pauli-limited, the size of the superconducting energy gap can be calculated. The role of spin-orbit scattering and many-body effects play a role in explaining our measurements.

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Scaling behavior of the rf vortex penetration depth in an organic superconductor

Cited by 30 publications

References 17 publications

Critical-state flux penetration and linear microwave vortex response inYBa2Cu3O<

Critical-state flux penetration and linear microwave vortex response inYBa2Cu3O<

Intergrain Connectivity and Resistive Broadening in Vortex State: A Comparison Between ${\rm MgB}_{2}$, ${\rm NbSe}_{2}$ and ${\rm Bi}_{2}{\rm Sr}_{2}{\rm Ca}_{2}{\rm Cu}_{3}{\rm O}_{10}$ Superconductors

Bulk two-dimensional Pauli-limited superconductor

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