Transverse Josephson Plasma Mode in T* Cuprate Superconductors

T. Kakeshita, S. Uchida, K. M. Kojima, S. Adachi, S. Tajima, B. Gorshunov, and M. Dressel
Phys. Rev. Lett. 86, 4140 – Published 30 April 2001
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Abstract

A transverse optical plasma mode is observed at far-infrared frequencies within the superconducting gap region by measuring the c-axis optical reflectivity for single crystals of T* cuprate superconductors SmLa0.85Sr0.15CuO4δ and Nd1.4Sr0.4Ce0.2CuO4δ. These T* cuprates have two different insulating layers sandwiching the superconducting CuO2 planes, leading to two longitudinal plasmons. Also, the transverse mode is directly observed due to the coupling of the infrared radiation with the current perpendicular to the superconducting layers which are regarded as an alternating array of two inequivalent Josephson junctions.

  • Received 5 October 2000

DOI:https://doi.org/10.1103/PhysRevLett.86.4140

©2001 American Physical Society

Authors & Affiliations

T. Kakeshita1, S. Uchida1, K. M. Kojima1, S. Adachi2, S. Tajima2, B. Gorshunov3,*, and M. Dressel3

  • 1Department of Superconductivity, University of Tokyo, Yayoi 2-11-16, Bunkyo-ku, Tokyo 113-8656, Japan
  • 2Superconductivity Research Laboratory, ISTEC, Shinonome 1-10-13, Koto-ku, Tokyo 135-0062, Japan
  • 31. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany

  • *Permanent address: General Physics Institute, Russian Academy of Sciences, 117942 Moscow, Russia.

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Vol. 86, Iss. 18 — 30 April 2001

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