First-principles insights into f magnetism, a case study on some magnetic pyrochlores

Abstract

First-principles calculations are performed to investigate f magnetism in A${}_2$Ti${}_2$O${}_7$ (A=Eu, Gd, Tb, Dy, Ho, Er, Yb) magnetic pyrochlore oxides. The Hubbard U parameter and the relativistic spin orbit correction is applied for more accurate description of the electronic structure of the systems. It is argued that the main obstacle for first-principles study of these systems is the multi-minima solutions of their electronic configuration. Among the studied pyrochlores, Gd${}_2$Ti${}_2$O${}_7$ shows the least multi-minima problem. The crystal electric field theory is applied for phenomenological comparison of the calculated spin and orbital moments with the experimental data.

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