Absence of non-linear Meissner effect in YBa2Cu3O6.95

Physics – Condensed Matter – Superconductivity

Scientific paper

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4 pages, 4 figures (Latex file + Postscipt figures)

Scientific paper

10.1103/PhysRevB.59.R14173

We present measurements the field and temperature dependence of the penetration depth (lambda) in high purity, untwinned single crystals of YBa2Cu3O6.95 in all three crystallographic directions. The temperature dependence of lambda is linear down to low temperatures, showing that our crystals are extremely clean. Both the magnitude and temperature dependence of the field dependent correction to lambda however, are considerably different from that predicted from the theory of the non-linear Meissner effect for a d-wave superconductor (Yip-Sauls theory). Our results suggest that the Yip-Sauls effect is either absent or is unobservably small in the Meissner state of YBa2Cu3O6.95.

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