Coexistence of Superconductivity and Antiferromagnetism in Heavy-Fermion Intermetallic Compound CeRhIn5
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An interference of heavy-fermion superconductivity (SC) and antiferromagnetism (AFM) has been studied in the framework of the periodic Anderson model with the superexchange interaction between localized electrons. It has been shown that pressure-induced energy change of the localized states leads to modifying antiferromagnetic and superconducting order parameters. Conditions have been found for the coexistence of SC and AFM in the model. Theoretical results of the pressure effects on the ground state character of the heavy-fermion systems are in good agreement with experimental data for a rare-earth intermetallic compound CeRhIn5. The divergence of the effective electron mass produced by suppressing the long-range antiferromagnetic order has also been analyzed in the same framework.
KeywordsCoexistence superconductivity antiferromagnetism Periodic Anderson model Heavy-fermion systems
This work was supported by the program “Quantum mesoscopic and disordered matter” of the Presidium of the RAS; the Russian Foundation for Basic Research (the projects No. 13-02-00523 and No. 12-02-31130); The Ministry of education and science of Russia, project 220.127.116.110 and the grant of the President of the Russian Federation (project MK-526.2013.2).