Anomalous magnetoresistance of ultrathin films of DyBa2Cu3O7−x near the superconductor-insulator transition

T. Wang; K. M. Beauchamp; A. M. Mack; N. E. Israeloff; G. C. Spalding; A. M. Goldman

doi:10.1103/PhysRevB.47.11619

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Anomalous magnetoresistance of ultrathin films of DyBa2Cu3O7−x near the superconductor-insulator transition

T. Wang, K. M. Beauchamp, A. M. Mack, N. E. Israeloff, G. C. Spalding, A. M. Goldman

DOI 10.1103/PhysRevB.47.11619 · Physical Review B

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Abstract

An anomalous peak in the magnetoresistance was observed in granular ultrathin films of DyBa2Cu3O7−x whose low-temperature behaviors span the zero-field superconductor-insulator transition. The magnitude of this peak increased with the weakening of the superconductivity of the films. Frustration effects in a Josephson coupled superconducting array are not sufficient to account for the peak. Instead, this unusual behavior may result from an interaction of the carriers with antiferromagnetically ordered Cu2+ ions on the copper-oxygen sheets, providing a crucial link between superconductivity and magnetism.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
DyBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2	Pressure not reported	zero_resistance
DyBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	onset