Critical Current Suppression in a Superconductor by Injection of Spin-Polarized Carriers from a Ferromagnet

V. A. Vas'ko; V. A. Larkin; P. A. Kraus; K. R. Nikolaev; D. E. Grupp; C. A. Nordman; A. M. Goldman

doi:10.1103/PhysRevLett.78.1134

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Critical Current Suppression in a Superconductor by Injection of Spin-Polarized Carriers from a Ferromagnet

V. A. Vas'ko, V. A. Larkin, P. A. Kraus, K. R. Nikolaev, D. E. Grupp, C. A. Nordman, A. M. Goldman

DOI 10.1103/PhysRevLett.78.1134 · Physical Review Letters

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Abstract

The critical current of a thin film of the high- Tc superconductor DyBa2Cu3O7, when incorporated in a heterostructure in which it is separated from a ferromagnetic underlayer of La2/3Sr1/3MnO3 by an undoped ultrathin La2CuO4 film, has been found to be strongly suppressed by current flowing in the ferromagnetic film. A control experiment with a Au film replacing the ferromagnet did not show such a response, and resistive heating was ruled out by additional measurements. The effect would appear to be caused by pair breaking associated with spin-polarized carriers being injected into the superconductor.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
DyBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	71	Pressure not reported	zero_resistance
DyBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89	Pressure not reported	unknown