Local-moment formation in the periodic Anderson model with superconducting correlations

M. A. N. Araújo; N. M. R. Peres; P. D. Sacramento

doi:10.1103/PhysRevB.65.012503

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Local-moment formation in the periodic Anderson model with superconducting correlations

M. A. N. Araújo, N. M. R. Peres, P. D. Sacramento

DOI 10.1103/PhysRevB.65.012503 · Physical Review B

T1

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Abstract

We study local-moment formation in the presence of superconducting correlations among the f electrons in the periodic Anderson model. Local moments form if the Coulomb interaction U>Ucr. We find that Ucr is considerably stronger in the presence of superconducting correlations than in the nonsuperconducting system. Our study is done for various values of the f-level energy and electronic density. The smallest critical Ucr values occur for the case where the number of f electrons per site is equal to 1. In the presence of d-wave superconducting correlations we find that local-moment formation presents a quantum phase transition as function of pressure. This quantum phase transition separates a region where local moments and d-wave superconductivity coexist from another region characterized by a superconducting ground state with no local moments. We discuss the possible relevance of these results to experimental studies of the competition between magnetic order and superconductivity in CeCu2Si2.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
URu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
U0.97Th0.03Be13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
UPd2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2	Pressure not reported	unknown
UNi2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.2	Pressure not reported	unknown