dorsal/arxiv
View SchemaVortex Response and Critical Fields observed via rf penetration depth measurements on the superconductor YNi_2B_2C
| Authors | S. Oxx, D. P. Choudhury, Balam A. Willemsen, H. Srikanth, S. Sridhar, B. K. Cho, P. C. Canfield |
|---|---|
| Categories | |
| ArXiv ID | supr-con/9602003 |
| URL | https://arxiv.org/abs/supr-con/9602003 |
| DOI | 10.1016/0921-4534(96)00230-4 |
Abstract
Measurements of the rf penetration depth \lambda(T,H,\theta ) are used to study the superconducting order parameter, vortex dynamics in the mixed state and delineate critical fields in the borocarbide superconductor YNi_2B_2C. The lower critical field has an anomalous T dependence, H_{c1}(T)=1.12[1-(T/T_c)] kOe, which is however consistent with independent superfluid density measurements at microwave frequencies. The vortex response is dominated by viscous flux flow, indicative of extremely weak pinning, and is parametrized by a field scale H_{c2,eff}. The angular dependence of the vortex contribution \lambda(\theta) is in good agreement with the Coffey-Clem model. Structure is seen in the depairing transition in the vicinity of the upper critical field, with the existence of well-defined critical fields H_{c2a}, H_{c2b} and H_{c2c}, with the vortex field scale H_{c2,eff} closest to H_{c2b}. Overall the measurements indicate that YNi_2B_2C has a rich and unusual field dependence of its transport parameters.
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"abstract": "Measurements of the rf penetration depth \\lambda(T,H,\\theta ) are used to\nstudy the superconducting order parameter, vortex dynamics in the mixed state\nand delineate critical fields in the borocarbide superconductor YNi_2B_2C. The\nlower critical field has an anomalous T dependence, H_{c1}(T)=1.12[1-(T/T_c)]\nkOe, which is however consistent with independent superfluid density\nmeasurements at microwave frequencies. The vortex response is dominated by\nviscous flux flow, indicative of extremely weak pinning, and is parametrized by\na field scale H_{c2,eff}. The angular dependence of the vortex contribution\n\\lambda(\\theta) is in good agreement with the Coffey-Clem model. Structure is\nseen in the depairing transition in the vicinity of the upper critical field,\nwith the existence of well-defined critical fields H_{c2a}, H_{c2b} and\nH_{c2c}, with the vortex field scale H_{c2,eff} closest to H_{c2b}. Overall the\nmeasurements indicate that YNi_2B_2C has a rich and unusual field dependence of\nits transport parameters.",
"arxiv_id": "supr-con/9602003",
"authors": [
"S. Oxx",
"D. P. Choudhury",
"Balam A. Willemsen",
"H. Srikanth",
"S. Sridhar",
"B. K. Cho",
"P. C. Canfield"
],
"categories": [
"supr-con",
"cond-mat.supr-con"
],
"doi": "10.1016/0921-4534(96)00230-4",
"title": "Vortex Response and Critical Fields observed via rf penetration depth measurements on the superconductor YNi_2B_2C",
"url": "https://arxiv.org/abs/supr-con/9602003"
},
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