Dynamical Superconducting Order Parameter Domains in Sr 2 RuO 4

Author:

Kidwingira Francoise12,Strand J. D.12,Van Harlingen D. J.12,Maeno Yoshiteru12

Affiliation:

1. Department of Physics, University of Illinois, Urbana, IL 61801, USA.

2. Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

Abstract

We present direct evidence for complex p-wave order parameter symmetry and the presence of dynamical chiral order parameter domains of the form p x ± ip y in the ruthenate superconductor Sr 2 RuO 4 . The domain structure creates differences in the magnetic field modulation of the critical current of Josephson junctions fabricated on orthogonal faces of Sr 2 RuO 4 single crystals. Transitions between the chiral states of a domain or the motion of domain walls separating them generates telegraph noise in the critical current as a function of magnetic field or time and is responsible for hysteresis observed in field sweeps of the critical current. The presence of such domains confirms the p-wave triplet spin and complex (broken time-reversal symmetry) nature of the superconducting pairing state in Sr 2 RuO 4 .

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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