BASIC RESEARCH ON FERROMAGNETIC SUPERCONDUCTORS

The electrical and magnetic properties of several alloys of EuRu2 or GdRu2 with CeRu2 were measured in the temperature range 1K - 30K and in applied magnetic fields up to 6 K0e. One sample of CeRu2 and several of GdRu2 - CeRu2 had a low density and exhibited an anomalous behavior. These specimens un...

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Bibliographic Details
Main Authors: Daunt,John G, Drautman,James J, Anderson,Charles J, Stern,Samuel H
Format: Report
Language:English
Subjects:
DENSITY
HYSTERESIS
SUPERCONDUCTIVITY
X RAY DIFFRACTION
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Summary:The electrical and magnetic properties of several alloys of EuRu2 or GdRu2 with CeRu2 were measured in the temperature range 1K - 30K and in applied magnetic fields up to 6 K0e. One sample of CeRu2 and several of GdRu2 - CeRu2 had a low density and exhibited an anomalous behavior. These specimens underwent an incipient superconducting transition and were either paramagnetic or ferromagnetic at temperatures below that of the superconducting transition. All of the europium samples had a high density and had sharp superconducting transitions in which the susceptibility became negative. The value of T sub c decreased slowly with EuRu2 concentration, being 4.67K for a specimen containing 50% EuRu2. Upper and lower critical field values were found for all of these samples. There was a hysteresis in the value of T sub c measured in zero field not attributable to superheating and supercooling, which indicated the presence of ferromagnetic ordering. The relation between the specimen structure and behavior is discussed. The results indicate that ferromagnetic superconductivity may be possible in an homogeneous material. (Author)