Absence of broken time reversal symmetry beneath the surface of YBCO films

A. Suter; E. Morenzoni; H. Huhtinen; H. Saadaoui; P. Paturi; T. Prokscha; Z. Salman

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Absence of broken time reversal symmetry beneath the surface of YBCO films

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arxiv 1311.0631 v1 pith:3ZH3YWSJ submitted 2013-11-04 cond-mat.supr-con

H. Saadaoui , Z. Salman , T. Prokscha , A. Suter , H. Huhtinen , P. Paturi , E. Morenzoni This is my paper

classification cond-mat.supr-con

keywords filmsspontaneousfieldfieldsresultsreversalsuperconductingsurface

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We report the results of a search for spontaneous magnetism due to a time reversal symmetry breaking phase in the superconducting state of (110)-oriented YBCO films, expected near the surface in this geometry. Zero field and weak transverse field measurements performed using the low-energy muon spin rotation technique with muons implanted few nm inside optimally-doped YBCO-(110) films show no appearance of spontaneous magnetic fields below the superconducting temperature down to 2.9 K. Our results give an upper limit of ~0.02 mT for putative spontaneous internal fields.

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