Small moments without long-range magnetic ordering in the zero-temperature ground state of the double perovskite iridate Ba2YIrO6

Hermann Schnait*, Daniel Bauernfeind, Tanusri Saha-Dasgupta, Markus Aichhorn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The spin-orbit coupled double perovskite iridate Ba2YIrO6 with d4 occupancy of Ir is considered as a candidate material for a nonmagnetic J=0 ground state. The issue of existence of such a state in Ba2YIrO6, however, has opened up intense debates both in experimental and theoretical studies. In this study, we revisit the issue using ab initio density functional combined with dynamical mean-field theory to investigate the magnetic properties of Ba2YIrO6 down to zero temperature. To reach the ground state, a recently developed impurity solver based on tensor-product states working directly at zero temperature is employed. We find that Ba2YIrO6 has a small instantaneous nonzero magnetic moment, both at T=0K as well as at room temperature. We did not observe any evidence of magnetic ordering, not even at T=0K. From the calculated local magnetic susceptibility we see that the quantum fluctuations are very strong and effective in screening the instantaneous moments. This dynamical screening, together with frustration effects in the fcc lattice that can lead to almost degenerate magnetic ground states, prevents any long-range ordering.

Original languageEnglish
Article number035132
JournalPhysical Review B
Issue number3
Publication statusPublished - 15 Jul 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)
  • Theoretical


  • NAWI Graz

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