Magnetotransport study of the magnetic superconductors GdSr2Ru1 −xCu2 +xO8

Autor: R. Nirmala, S. K. Malik, Awadhesh Mani, T. Geetha Kumary, M. C. Valsakumar, J. Janaki
Rok vydání: 2011
Předmět:
Superconductivity
Materials science
Condensed matter physics
Magnetoresistance
Antiferromagnetic orders
Cu-doping
Electrical resistivity measurements
In-field
Internal field
Low field
Magnetic superconductors
Magnetic transition temperature
Normal state
Parent compounds
Positive magnetoresistance
Rutheno-cuprates
Temperature range
Vortex lattices
Antiferromagnetism
Electric resistance
Magnetoelectronics
Superconducting materials
Superconducting transition temperature
Magnetic field effects
Metals and Alloys
Atmospheric temperature range
Condensed Matter Physics
Microstructure
Magnetic field
Vortex
Electrical resistivity and conductivity
Condensed Matter::Superconductivity
Materials Chemistry
Ceramics and Composites
Condensed Matter::Strongly Correlated Electrons
Electrical and Electronic Engineering
Zdroj: Superconductor Science and Technology. 24:095001
ISSN: 1361-6668
0953-2048
DOI: 10.1088/0953-2048/24/9/095001
Popis: Magnetotransport studies were carried out for the ruthenocuprates GdSr 2Ru1 - xCu2 + xO8 (x = 0 and 0.05) in the temperature range 2-300K and in fields up to 9T. The electrical resistivity measurements near the superconducting region indicate that these compounds exhibit granular superconductivity. The magnetic field has significant effects on the intragranular superconducting transition temperature (T 1) as well as the inter-granular superconducting transition temperature (T2) which can be attributed to the microstructure as well as the large internal fields present in these compounds. The analysis of the magnetic field induced broadening of the resistivity transitions in these compounds suggests a two-dimensional nature for the vortex lattice. The magnetoresistance in the normal state is in general negative and its magnitude reaches a maximum around the magnetic transition temperature (TM). A positive magnetoresistance is observed at low fields for temperatures below TM in the parent compound which is absent in the Cu doped compound. The difference in the magnetoresistance behavior below TM is argued to be due to the weakening of the antiferromagnetic order upon Cu doping. � 2011 IOP Publishing Ltd.
Databáze: OpenAIRE
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