Superconductivity and specific heat of Ru1-xTaxSr2GdCu2O8 and RuSr2Gd1.4Ce0.6Cu2Oy
- 1. Structure Research Laboratory and Department of Physics, University of Science and Technology of China, Hefei, Anhui (China)
- 2. National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing (China)
Description
Samples of the compounds Ru1-xTaxSr2GdCu2O8 (Ru-1212) (x=0.0, 0.05, 0.15) and RuSr2Gd1.4Ce0.6Cu2Oy (Ru-1222) have been characterized by means of the resistivity, thermoelectric power, magnetic susceptibility and specific heat. Ta doping apparently suppresses superconductivity for the Ru1-xTaxSr2GdCu2Oy system. The transport measurements show that the samples of Ru-1212 are typical underdoped cuprates; the sample of Ru-1222 is nearly at the optimal doping level. Specific heat measurements show an anomalous peak around Tc, indicating bulk superconductivity, whilst magnetic measurements seem to show the absence of a bulk Meissner state, which results because the susceptibility from the impurity Sr2GdRuO6 counters the diamagnetization from the bulk superconductivity. (author)
Availability note (English)
Available online at the Web site for the Journal of Physics. Condensed Matter (ISSN 1361-648X) http://www.iop.org/Additional details
Identifiers
- URL
- http://www.iop.org/;
Publishing Information
- Journal Title
- Journal of Physics. Condensed Matter
- Journal Volume
- 12
- Journal Issue
- 50
- Journal Page Range
- p. 10561-10569
- ISSN
- 0953-8984
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- Chile
- INIS RN
- 32031438
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- CERIUM COMPOUNDS; CUPRATES; DOPED MATERIALS; ELECTRICAL PROPERTIES; RUTHENIUM COMPOUNDS; SPECIFIC HEAT; STRONTIUM COMPOUNDS; SUPERCONDUCTING COMPOSITES; SUPERCONDUCTIVITY; TANTALUM COMPOUNDS
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; COMPOSITE MATERIALS; COPPER COMPOUNDS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; MATERIALS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; REFRACTORY METAL COMPOUNDS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS