Paramagnetic meissner effect in YBa_(2)Cu_(3)O_(7)/La_(0.7)Ca_(0.3)MnO_(3) superlattices
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2006
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American Physical Society
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Abstract
We report the observation of a paramagnetic contribution to the field cooled magnetization that develops below the superconducting transition temperature T_(c) in measurements performed on YBa_(2)Cu_(3)O_(7)/La_(0.7)Ca_(0.3)MnO_(3) superlattices. The effect has been detected only for samples whose manganite layers are magnetically granular. We discuss our observation of this paramagnetic Meissner effect (Wohlleben effect) in terms of an inhomogeneous superconducting state at the interface with the magnetically granular manganite layers.
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© 2006 The American Physical Society. Work at Universidad Complutense de Madrid was supported by MCYT MAT 2005-06024-C02-02, CAM GRMAT-0771/2004, UCM PR3/04-12399 and Fundación Ramón Areces. M. A. López de la Torre acknowledges financial support through JCCM projects PBI-02-015 and PAI-05- 013. We thank A. Quijano and J. J Palacios for helpful discussions.