Magnetic field tunneling spectroscopy of YBa2Cu3O7−δ/La0.67Sr0.33MnO3 junctions

✍ Scribed by H. Kashiwaya; S. Kashiwaya; B. Prijamboedi; K. Ikeda; I. Kurosawa; H. Tsuchiura; Y. Tanaka

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 264 KB
• Volume: 412-414
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2004.01.051

✦ Synopsis

The magnetic field responses of the zero-bias conductance peaks (ZBCP) in tunneling spectra of YBa 2 Cu 3 O 7Àd / La 0:67 Sr 0:33 MnO 3 (YBCO/LSMO) junctions are investigated. Two different responses of the ZBCP are shown. One is insensitive to the field up to 9 T, the other is highly sensitive and easily suppressed by the applied field less than 1 T. Accordingly the origins of the ZBCP are attributed to the mid-gap Andreev bound states and the coherent Andreev reflection, respectively. The coexistence of two different origins in d-wave junction is consistent with the theoretical prediction based on the circuit theory.