Thickness dependent spin-injection effects in Nd0.7Ca0.3MnO3/YBa2Cu3O7 bilayers.

Authors :: Hsu, Daniel
Lin, J. G.
Chang, C. P.
Chen, C. H.
Chiang, C. H.
Chan, W. C.
Wu, W. F.
Source :: Journal of Applied Physics; Apr2008, Vol. 103 Issue 7, p07C710, 3p
Publication Year :: 2008
Abstract: Two Nd<subscript>0.7</subscript>Ca<subscript>0.3</subscript>MnO<subscript>3</subscript>/YBa<subscript>2</subscript>Cu<subscript>3</subscript>O<subscript>7</subscript> (NCMO/YBCO) bilayers with different thickness ratios are fabricated and the spin-injection effects are investigated. The NCMO/YBCO samples have thicknesses of 100 nm/200 nm and 200 nm/200 nm, which are denoted as N/Y(1) and N/Y(2), respectively. It is shown that the current-induced suppression rate of superconducting transition temperature (dT<subscript>c</subscript>/dI) in YBCO is enhanced by four to six times of magnitude in N/Y(1) and N/Y(2) compared with that in pure YBCO. Furthermore, dT<subscript>c</subscript>/dI in N/Y(2) is larger than that in N/Y(1), which suggests that the thickness of NCMO has influence on the pair breaking in YBCO. [ABSTRACT FROM AUTHOR]

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