Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 30: Superconductivity: Twenty Years High-T_c Cuprates - Recent Progress

TT 30.13: Talk

Thursday, March 30, 2006, 17:15–17:30, HSZ 02

Doping dependent tunneling behavior in electron-doped cuprates — •Yoshiharu Krockenberger¹, Andreas Winkler¹, Akio Tsukada², Michio Naito³, Dirk Manske⁴, and Lambert Alff¹ — ¹TU Darmstadt — ²NTT, Atsugi, Japan — ³TUAT, Tokyo, Japan — ⁴MPI-FKF Stuttgart

Recently in the electron doped cuprates a pseudogap of the order of the superconducting gap has been observed by tunneling experiments [1]. In order to investigate the phase diagram in more detail, we have studied a series of Pr_2−xCe_xCuO_4+y thin film junctions within the whole doping region between 0<x<0.2. Our results support the idea that the phase diagram of the electron doped cuprates is governed by a competition of superconductivity and other types of order. It is an open question how an ordered state at low doping can coexist with antiferromagnetic order.

This work is supported by the Deutsche Forschungsgemeinschaft (Research unit 538).

[1] L. Alff et al., Nature 422, 698 (2003).