Spin-polarized transport across a La0.7Sr0.3MnO3/YBa2Cu3O7-x interface: role of Andreev bound states

Chen, Z. Y. ; Biswas, Amlan ; Zutic, Igor ; Wu, T. ; Ogale, S. B. ; Greene, R. L. ; Venkatesan, T. (2001) Spin-polarized transport across a La0.7Sr0.3MnO3/YBa2Cu3O7-x interface: role of Andreev bound states Physical Review B, 63 (21). 212508_1- 212508_4. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v63/i21/e212508

Related URL: http://dx.doi.org/10.1103/PhysRevB.63.212508

Abstract

Transport across an La0.7Sr0.3MnO3/YBa2Cu3O7-x (LSMO/YBCO) interface is studied as a function of temperature and surface morphology. For comparison, control measurements are performed in nonmagnetic heterostructures of LaNiO3/YBCO and Ag/YBCO. In all cases, YBCO is used as bottom layer to eliminate the channel resistance and to minimize thermal effects. The observed differential conductance reflects the role of Andreev bound states in the a-b plane, and displays the suppression of such states by the spin-polarized transport across the interface. The theoretical analysis of the measured data reveals decay of the spin polarization near the LSMO surface with temperature, consistent with the reported photoemission data.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:26866
Deposited On:08 Dec 2010 13:04
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