Vortex pinning in electron-doped cuprate superconductor La2-xCexCuO4-y

Yuri Zuev, Thomas R. Lemberger, John A. Skinta, Tine Greibe, Michio Naito

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

We have measured the vortex pinning strength in thin films of the electron-doped cuprate La2-xCexCuO4 for various doping x from x = 0.075 (T-c = 25 K) to x = 0.15 (T-c = 12.5 K). The optimal doping for this compound is x approximate to 0.11, at which T-c = 29 K. Films were prepared by a molecular-beam epitaxy method. A structural XRD investigation revealed no doping-induced lattice strain. We use a two-coil technique at frequencies from 10 to 100 kHz. The superfluid density n(s)(0) grows rapidly with x on the underdoped side and decreases slowly on the overdoped side. The Labusch parameter kappa, i.e. the spring constant for a pinned vortex, shows large variations as the doping changes. It increases with x rapidly to a maximum at slight underdoping and then it decreases on the overdoped side more rapidly than n(s)(0). Even at optimal doping kappa(0) is an order of magnitude lower than the highest values observed in YBCO.
Original languageEnglish
JournalIPPS physica status solidi (b)
Volume236
Issue number2
Pages (from-to)412-415
ISSN0370-1972
DOIs
Publication statusPublished - 2003
Externally publishedYes
EventEuropean Conference on Physics of Magnetism (PM 02) - Poznan, Poland
Duration: 1 Jul 20025 Jul 2002

Conference

ConferenceEuropean Conference on Physics of Magnetism (PM 02)
CountryPoland
CityPoznan
Period01/07/200205/07/2002

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