Superconducting phase transitions in ErcY1?cRh4B4 |
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Authors: | K Okuda Y Nakakura K Kadowaki |
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Institution: | Department of Physics, Faculty of Science, Osaka University, Toyonaka, Osaka 560, Japan |
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Abstract: | The superconducting transition temperature Tc1 and the reentering temperature Tc2 to the normal ferromagnetically ordered state in the system ErcY1?cRh4B4 were determined as a function of the concentration of Er. Comparing our results with the recent theory of Maekawa et al., the exchange interactions J′ among local spins and I between local spins and superconducting electrons were estimated as J′ ? 0.30 K and I2N(0) ? 0.046 K, where N(0) is the density of states. A sudden decrease of Hc2 at Tc2 was observed in a high concentration region suggesting the first order transition. |
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