Evidence for a low-temperature magnetic ground state in double-perovskite iridates with i r5+(5d4) ions

J. Terzic, H. Zheng, Feng Ye, H. D. Zhao, P. Schlottmann, L. E. De Long, S. J. Yuan, G. Cao

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

We report an unusual magnetic ground state in single-crystal, double-perovskite Ba2YIrO6 and Sr-doped Ba2YIrO6 with Ir5+(5d4) ions. Long-range magnetic order below 1.7 K is confirmed by dc magnetization, ac magnetic susceptibility, and heat-capacity measurements. The observed magnetic order is extraordinarily delicate and cannot be explained in terms of either a low-spin S=1 state, or a singlet Jeff=0 state imposed by the spin-orbit interactions (SOI). Alternatively, the magnetic ground state appears consistent with a SOI that competes with comparable Hund's rule coupling and inherently large electron hopping, which cannot stabilize the singlet Jeff=0 ground state. However, this picture is controversial, and conflicting magnetic behavior for these materials is reported in both experimental and theoretical studies, which highlights the intricate interplay of interactions that determine the ground state of materials with strong SOI.

Original languageEnglish
Article number064436
JournalPhysical Review B
Volume96
Issue number6
DOIs
StatePublished - Aug 29 2017

Bibliographical note

Publisher Copyright:
© 2017 American Physical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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