Importance of Local Band Effects for Ferromagnetism in Hole-Doped La2CuO4 Cuprate Superconductors

B. Barbiellini; T. Jarlborg

doi:10.1103/PhysRevLett.101.157002

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Importance of Local Band Effects for Ferromagnetism in Hole-Doped La2CuO4 Cuprate Superconductors

B. Barbiellini, T. Jarlborg

DOI 10.1103/PhysRevLett.101.157002 · Physical Review Letters

T1

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Abstract

Band calculations for supercells of La(2−x)BaxCuO4 show that the rigid band model for doping is less adequate than what is commonly assumed. In particular, weak ferromagnetism can appear locally around clusters of high Ba concentration. The clustering is important at large dilution, and averaged models for magnetism, such as the virtual crystal approximation, are unable to stabilize magnetic moments. These results give support to the idea that weak ferromagnetism can be the cause of the destruction of superconductivity at high hole doping.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown