Very large purely intralayer critical current density in ultrathin cuprate artificial structures

G Balestrino; P G Medaglia; P Orgiani; A Tebano; C Aruta; S Lavanga; A A Varlamov

doi:10.1103/PhysRevLett.89.156402

Very large purely intralayer critical current density in ultrathin cuprate artificial structures

Phys Rev Lett. 2002 Oct 7;89(15):156402. doi: 10.1103/PhysRevLett.89.156402. Epub 2002 Sep 23.

Authors

G Balestrino¹, P G Medaglia, P Orgiani, A Tebano, C Aruta, S Lavanga, A A Varlamov

Affiliation

¹ INFM-COHERENTIA and Dipartimento di Ingegneria Meccanica, Università di Roma Tor Vergata, Via del Politecnico 1, Italy.

PMID: 12366006
DOI: 10.1103/PhysRevLett.89.156402

Abstract

Ultrathin artificial high temperature superconducting structures, consisting of (Ba(0.9)Nd0.1)CuO2+x and CaCuO2 layers, were grown by pulsed laser deposition. Intralayer superconductivity at 60 K was obtained for a structure consisting of a single (CaCuO2) block sandwiched between two (Ba(0.9)Nd0.1)CuO2+x charge reservoir blocks. The purely intralayer critical current density was measured at 4.2 K and resulted to be larger than 10(8) A/cm(2). These findings clearly show that interaction between nearest neighbor (CaCuO2) layers is not essential for high T(c) superconductivity and strongly supports the physical model based on the idea that intralayer interaction alone is responsible for high temperature superconductivity.