Coexistence of antiferromagnetism and superconductivity within t-J model with strong correlations and nonzero spin polarization

Jan Kaczmarczyk; Jozef Spałek

doi:10.1103/PhysRevB.84.125140

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Coexistence of antiferromagnetism and superconductivity within t-J model with strong correlations and nonzero spin polarization

Jan Kaczmarczyk, Jozef Spałek

DOI 10.1103/PhysRevB.84.125140 · Physical Review B

T1

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Abstract

The coexistence of antiferromagnetism with superconductivity is studied theoretically within the t-J model with the Zeeman term included. The strong electron correlations are accounted for by means of the extended Gutzwiller projection method within a statistically consistent approach proposed recently. The phase diagram on the band filling-magnetic field plane is shown, and subsequently the system properties are analyzed for the fixed band filling n=0.97. In this regime, the results reflect principal qualitative features observed recently in selected heavy-fermion systems, namely, (i) with the increasing magnetic field the system evolves from coexisting antiferromagnetic-superconducting phase through antiferromagnetic phase toward polarized paramagnetic state and (ii) the onset of superconducting order suppresses partly the staggered moment. The superconducting gap has both the spin-singlet and the staggered-triplet components, a direct consequence of a coexistence of the superconducting state with antiferromagnetism.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeRhIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeIrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeCo(In1-xCdx)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeRhSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown