Mechanisms of electrical conductivity in Y1−xCaxBa2Cu3O6.1 system

✍ Scribed by P. Starowicz; A. Szytuła

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 840 KB
• Volume: 424
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2005.04.023

✦ Synopsis

Systematic studies of transport properties in deoxygenated Y 1Àx Ca x Ba 2 Cu 3 O 6.1 series allowed to propose a diagram of conductivity mechanisms for this system. At intermediate temperature a variable range hopping (VRH) in two-dimensions prevails. At lower temperature VRH in the presence of a Coulomb gap for smaller x and VRH in two-dimensions for larger x are found. In a vicinity of superconductivity we observe conductivity proportional to ffiffiffi ffi T p . Thermally activated conductivity dominates at higher temperature. This diagram may be universal for the whole family of undoped high T c related cuprates.