dorsal/arxiv
View SchemaCritical State Flux Penetration and Linear Microwave Vortex Response in YBa_2Cu_3O_{7-x} Films
| Authors | Balam A. Willemsen, J. S. Derov, S. Sridhar |
|---|---|
| Categories | |
| ArXiv ID | supr-con/9609002 |
| URL | https://arxiv.org/abs/supr-con/9609002 |
| DOI | 10.1103/PhysRevB.56.11989 |
Abstract
The vortex contribution to the dc field (H) dependent microwave surface impedance Z_s = R_s+iX_s of YBa_2Cu_3O_{7-x} 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: (1) Initial flux penetration occurs on very low field scales H_i(4.2K) 100Oe, (2) 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(4.2K) J_c*d 0.5T, (3) for very high fields H >>H_s, the flux density is uniform and the measurements enable direct determination of vortex parameters such as pinning force constants \alpha_p and vortex viscosity \eta. 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 observed results.
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"abstract": "The vortex contribution to the dc field (H) dependent microwave surface\nimpedance Z_s = R_s+iX_s of YBa_2Cu_3O_{7-x} thin films was measured using\nsuspended patterned resonators. Z_s(H) is shown to be a direct measure of the\nflux density B(H) enabling a very precise test of models of flux penetration.\nThree regimes of field-dependent behavior were observed: (1) Initial flux\npenetration occurs on very low field scales H_i(4.2K) 100Oe, (2) At moderate\nfields the flux penetration into the virgin state is in excellent agreement\nwith calculations based upon the field-induced Bean critical state for thin\nfilm geometry, parametrized by a field scale H_s(4.2K) J_c*d 0.5T, (3) for very\nhigh fields H \u003e\u003eH_s, the flux density is uniform and the measurements enable\ndirect determination of vortex parameters such as pinning force constants\n\\alpha_p and vortex viscosity \\eta. However hysteresis loops are in\ndisagreement with the thin film Bean model, and instead are governed by the low\nfield scale H_i, rather than by H_s. Geometric barriers are insufficient to\naccount for the observed results.",
"arxiv_id": "supr-con/9609002",
"authors": [
"Balam A. Willemsen",
"J. S. Derov",
"S. Sridhar"
],
"categories": [
"supr-con",
"cond-mat.supr-con"
],
"doi": "10.1103/PhysRevB.56.11989",
"title": "Critical State Flux Penetration and Linear Microwave Vortex Response in YBa_2Cu_3O_{7-x} Films",
"url": "https://arxiv.org/abs/supr-con/9609002"
},
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