Journal of the Physical Society of Japan · 1983 · 24 citations · 22 references
Superconducting MaterialMagnetic PropertiesSingle CrystalsEngineeringH C1Critical CurrentsMagnetismH C2SuperconductivityQuantum MaterialsHigh Tc SuperconductorsSuperconducting DevicesMaterials ScienceMixed StateHigh-tc SuperconductivityPhysicsQuantum MagnetismFerromagnetismHigh-temperature SuperconductivityNatural SciencesCondensed Matter PhysicsApplied Physics
The lower and the upper critical fields H c1 and H c2 , and the slope of magnetization at H c2 , (∂ M /∂ H ) c2 , are calculated in ferromagnetic superconductors. The theory takes account of the electromagnetic and the s-f exchange interactions between conduction electrons and localized f-electrons. When temperature decreases, (∂ M /∂ H ) c2 in the mixed state increases and diverges at a certain temperature. This indicates that below this temperature, the transition at H c2 is of a first order. Near the spin ordering temperature, H c2 decreases more rapidly than H c1 with decreasing temperature. The theoretical results are compared with experimental results in single crystals ErRh 4 B 4 in detail.
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