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TT: Tiefe Temperaturen

TT 6: Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter I

TT 6.5: Vortrag

Montag, 11. März 2002, 17:00–17:15, H19

Order Parameter Symmetry of Electron Doped Superconductors and Phase Sensitive Interferometry Experiments — •Boris Chesca¹, Katharina Ehrhardt¹, Michael Mößle¹, Rainer Straub¹, Albert Sterck¹, Dieter Kölle¹, Reinhold Kleiner¹, and Michio Naito² — ¹Physikalisches Institut-Experimentalphysik II, Universität Tübingen — ²Superconducting Thin Films Research Group, Material Science Research Department, NTT Basic Research Laboratory, Japan

The knowledge of the symmetry of the order parameter is crucial for the development of a microscopic theory for high transition temperature superconductors. For the hole doped cuprates there is overwhelming evidence for a d_x²−y² order parameter from both amplitude and phase sensitive experiments. A very suitable design for a phase sensitive interferometry test is a SQUID configuration that has spatially distributed junctions [1] showing d_x²−y² order parameter symmetry for the hole doped YBCO [2]. Here, we report on the present status of similar phase-sensitive experiments involving electron doped cuprates. Such experiments are of great interest because of the contradictory results obtained for these materials so far. [1] B. Chesca, Annalen der Physik (Leipzig) 8 (1999) 511. [2] R.R. Schulz et al., Appl. Phys. Lett. 76 (2000) 912.