Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 6: Postersitzung I (Amorphe- u. Tunnelsysteme, Niedrigdimensionale Systeme, Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter)

TT 6.32: Poster

Montag, 24. März 2003, 14:30–19:00, P2c, P2d

SUPPRESSION OF SUPERCONDUCTIVITY IN YBCO/LCMO SUPERLATTICES — •Martin Dressel¹, F. Chen^1,2, B. Gorshunov¹, G. Cristiani², and H.-U. Habermeier² — ¹1.Physikalisches Institut, Universität stuttgart, Germany. — ²2 Max-Planck Institut für Festkörperforschung, Stuttgart, Germany

Using optical spectroscopy with an emphasis on the range of 6 to 30 cm⁻¹ (0.2 - 1 THz), the competition of superconductivity and magnetism is studied in superlattices composed of alternative YBa₂Cu₃O_7−δ and La_0.67 Ca_0.33 MnO₃ thin layers deposited on LaSrGaO₄ (001) substrate. The thickness of YBCO layers used is 40 nm, 30 nm, and 20 nm while that of LCMO layer is kept at 20 nm. Clear evidence for interaction between the charge carriers and the magnetic subsystems is obtained: the metallic properties in the normal state and the condensate density in the superconducting state are drastically suppressed. The mechanism to suppress superconductivity is discussed in terms of gap symmetry distortion as a result of proximity effects.