A. Malinowski

Resistive and structural properties of La1.85Sr0.15Cu1−yZnyO4 films

Single-phase c-axis aligned La1.85Sr0.15Cu1−yZnyO4 films were grown by pulsed laser deposition with Zn contents up to a value of y of 0.12. The film properties indicate the existence of defects, in addition to the Zn impurities, that are unintentionally introduced during the film growth. These defects are probably oxygen vacancies, and have a distinctly different effect on Tc from the Zn. The separation of the two effects resolves earlier ambiguities in the observed rates of Tc depression.

Magnetic-field-induced localization in the normal state of superconducting La2-xSrxCuO4

Magnetoresistance measurements of highly underdoped superconducting La{sub 2{minus}x}Sr {sub x}CuO{sub 4} films with x=0.051 and x=0.048 , performed in dc magnetic fields up to 20T and at temperatures down to 40mK, reveal a magnetic-field{endash}induced transition from weak to strong localization in the normal state. The normal-state conductances per CuO{sub 2} plane, measured at different fields in a single specimen, are found to collapse to one curve with the use of a single scaling parameter that is inversely proportional to the localization length. The scaling parameter extrapolates to zero near zero field and possibly at a finite field, suggesting that in the zero-field limit the electronic states may be extended. {copyright} {ital 1997} {ital The American Physical Society}

Transition-metal substitutions in iron chalcogenides

The

Variable range hopping in the spin-glass phase of La2−xSrxCuO4

ab

Localization and interaction effects in strongly underdoped La2-xSrxCuO4

-plane resistivity and Hall effect are studied in Fe

Impurity and strain effects on the magnetotransport of La1.85Sr0.15Cu1-yZnyO4 films

_{1-y}

Metallic Nonsuperconducting Phase and D-Wave Superconductivity in Zn-Substituted La1.85Sr0.15CuO4

M

Metallic Nonsuperconducting Phase and D -Wave Superconductivity in Zn-Substituted La{sub 1.85}Sr{sub 0.15}CuO{sub 4}

_y

Magnetic-Field Induced Superconductor-Insulator Transition in the La2-xSrxCuO4 System.

Te

The Ni and Co substitutions in iron chalcogenide single crystals

_{0.65}