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Magnetismus Vortrag: Fr., 12:10–12:30 F-V69 Magnetism and Superconductivity in Electron Doped Cuprates A Muon Spin Relaxation Study on Thin Films of La2−xCexCuO4 Hans-Henning Klauss 1 , Hubertus Luetkens 2 , Yoshinari Krockenberger 3 , Andreas Winkler 4 , Lambert Alff 4 , Michio Naito 5 , Elvezio Morenzoni 2 , Thomas Prokscha 2 , Andreas Suter 2 , Jochen Litterst 1 1 TU Braunschweig, Inst. f. Physik d. Kondensierten Materie – 2 Paul-Scherrer-Institut, Villigen, Switzerland – 3 MPI f. Festkörperforschung, Stuttgart – 4 TU Darmstadt, Institut f. Materialwissenschaften – 5 NTT Basic Research Laboratory, Atsugi, Japan Unconventional superconductivity in strongly correlated electron systems like high temperature superconductors and heavy fermion systems is always in competion with magnetically ordered ground states. Muon spin relaxation (µSR) provides an ideal tool to examine long and short range magnetic order as well as the superconducting order parameter in these systems. In high-TC-cuprates it is used intensively to study e.g. the interplay of nanoscale stripe order and superconductivity in hole doped cuprates[1]. Similar studies of electron doped systems like (Nd,Pr)2−xCexCuO4 are disturbed by the presence of the magnetic rare earth elements. La2−xCexCuO4, not containing a magnetic rare earth, can only be prepared as thin films. We studied the magnetic and superconducting properties of this system for different x ranging from long range antiferromagnetism to the pure superconducting state on thin films with 60 to 300 nm thickness by means of state-of-the-art low-energy muon spin rotation (LE-µSR). The results show that optimally doped samples (x ≈ 0.10) with the highest TC = 28 K still exhibit a nanoscale coexistence of a magnetic surface layer with bulk superconductivity in the film. In an externally applied magnetic field, the superconducting films show Meissner screening with a magnetic penetration depth of the order of 250 to 300 nm. These measurements provide a clear differentiation between volume and filamentary surface superconductivity. The temperature dependence of the magnetic penetration depth can be used to characterize the symmetry of the order parameter. The results on these films will be compared with similar µSR studies on bulk samples of (Nd,Pr)2−xCexCuO4 [2]. [1] H.-H. Klauss, J. Phys: Cond. Mat. 16 (2004), S4457. [2] D. Baabe et al., Phys. Rev. B 69 (2004), 134512. Work supported in part by BMBF under contract 05 KK4MBA/2.
Abstracts: Poster Postersitzung A: Mittwoch, 4. 10. 2006, 14:00 - 16:30 Flügelbau ESA - West Methoden und Instrumentierung M-P1 – M-P96 Mikroskopie und Tomographie M-P97 – M-P114 Flügelbau ESA - Ost Struktur und Dynamik M-P115 – M-P167 Chemische Prozesse und Phasenübergänge M-P168 – M-P180 Biologische Systeme und Medizin M-P181 – M-P213
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Deutsche Tagung für Forschung mit
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Impressum: Herausgeber: A. Schreyer
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8:00 9:30 10:00 10:30 11:00 12:30 1
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Postersitzung A Mittwoch, 4. Oktobe
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Postersitzung B Donnerstag, 5. Okto
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12:30 - 13:35 Mittagspause Plenarsi
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Allgemeine Hinweise Tagungsort Die
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Lageplan Mensa Studierendenhaus (Ha
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Plenarvortrag Mi., 10:00-10:30 M-PV
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Plenarvortrag Mi., 17:00-17:30 M-PV
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Plenarvortrag Do., 13:00-15:30 D-PV
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Plenarvortrag Fr., 09:00-09:30 F-PV
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SNI für Neugierige Do., 15:30-16:0
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SNI für Neugierige Do., 16:30-17:0
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Senatsempfang Do., nach 18:00 D-AV1
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Mikroskopie und Tomographie Vortrag
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Mikroskopie und Tomographie Vortrag
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Dynamik Vortrag: Mi., 11:00-11:30 M
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Dynamik Vortrag: Mi., 11:50-12:10 M
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Nanostrukturen und Grenzflächen Vo
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Nanostrukturen und Grenzflächen Vo
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Index Autoren und ihre Beiträge: u
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Index M-P98, M-P100, M-P101, M-P195
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Index Deák, L. D-P300 Decker, H. M
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Index Gavrila, G. D-P276 Gebhardt,
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Index Homeyer, J. D-P377, D-P389 Ho
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Index Kravtsov, E. D-P231, D-P252 K
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Index Mezei, F. M-P13, M-P22, D-V27
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Index Ponce, M.L. D-P214 Ponkratz,
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Index Schmidt, O. M-P132, M-P153 Sc
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Index Stürmer, D. D-P405 Stuermer,
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Index Wochner, P. F-V68 Woiterski,
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