C-axis Josephson Tunneling Between YBCO and Pb: Direct Evidence for Mixed Order Parameter Symmetry in a High-T_c Superconductor

Дата и время публикации : 1997-05-28T00:23:29Z

Авторы публикации и институты :
K. A. Kouznetsov (UC Berkeley, UC San Diego, UI Urbana-Champaign)
A. G. Sun (UC Berkeley, UC San Diego, UI Urbana-Champaign)
B. Chen (UC Berkeley, UC San Diego, UI Urbana-Champaign)
A. S. Katz (UC Berkeley, UC San Diego, UI Urbana-Champaign)
S. R. Bahcall (UC Berkeley, UC San Diego, UI Urbana-Champaign)
John Clarke (UC Berkeley, UC San Diego, UI Urbana-Champaign)
R. C. Dynes (UC Berkeley, UC San Diego, UI Urbana-Champaign)
D. A. Gajewski (UC Berkeley, UC San Diego, UI Urbana-Champaign)
S. H. Han (UC Berkeley, UC San Diego, UI Urbana-Champaign)
M. B. Maple (UC Berkeley, UC San Diego, UI Urbana-Champaign)
J. Giapintzakis (UC Berkeley, UC San Diego, UI Urbana-Champaign)
J. -T. Kim (UC Berkeley, UC San Diego, UI Urbana-Champaign)
D. M. Ginsberg (UC Berkeley, UC San Diego, UI Urbana-Champaign)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 4 pages RevTex, 4 postscript figures included, submitted to Phys. Rev. Lett
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: We report a new class of $c$-axis Josephson tunneling experiments in which a conventional superconductor (Pb) is deposited across a single twin boundary of a YBa_2Cu_3O_{7-delta} crystal. We measure the critical current as a function of magnitude and angle of magnetic field applied in the plane of the junction. In all samples, we observe a clear experimental signature of an order parameter phase shift across the twin boundary. These results provide strong evidence for mixed $d$- and $s$-wave pairing in YBCO, with a reversal in the sign of the $s$-wave component across the twin boundary.

Category: Physics