Traversing the pyrochlore stability diagram; microwave-assisted synthesis and discovery of mixed B-site Ln${}_2$InSbO${}_7$ family

Abstract

The lanthanide pyrochlore oxides Ln${}_2$B${}_2$O${}_7$ are one of the most intensely studied classes of materials within condensed matter physics, firmly centered as one of the pillars of frustrated magnetism. The extensive chemical diversity of the pyrochlores, coupled with their innate geometric frustration, enables realization of a wide array of exotic and complex magnetic ground states. Thus, the discovery of new pyrochlore compositions has been a persistent theme that continues to drive the field in exciting directions. The recent focus on the mixed B-site pyrochlores offers a unique route towards tuning both local coordination chemistry and sterics, while maintaining a nominally pristine magnetic sublattice. Here, we present a broad overview of the pyrochlore stability field, integrating recent synthetic efforts in mixed B-site systems with the historically established Ln${}_2$B${}_2$O${}_7$ families. In parallel, we present the discovery and synthesis of the entire Ln${}_2$InSbO${}_7$ family (Ln: La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) located near the boundary of the pyrochlore stability field using a rapid, hybrid mechanicochemical/microwave-assisted synthesis technique. Magnetic characterization on the entire class of compounds draws striking parallels to the stannate analogs, suggesting that these compounds may host a breadth of exotic magnetic ground states.

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• Upper branch magnetism in quantum magnets: Collapses of excited levels and emergent selection rules
• Intermultiplet transitions and magnetic long-range order in Sm-based pyrochlores
• Quenched crystal field disorder and magnetic liquid ground states in Tb2Sn2-xTixO7
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• Evaluating the Effects of Structural Disorder on the Magnetic Properties of Nd${}_2$Zr${}_2$O${}_7$
• The magnetic structure of Gd_2Ti_2O_7
• Multi-phase competition in quantum $XY$ pyrochlore antiferromagnet CdYb${}_2$Se${}_4$: zero and applied magnetic field study
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• Absence of long-range order in an $XY$ pyrochlore antiferromagnet Er${}_2$AlSbO${}_7$

Cited by in corpus (3)

• Revisiting spin ice physics in the ferromagnetic Ising pyrochlore Pr${}_2$Sn${}_2$O${}_7$
• Collective magnetic state induced by charge disorder in the non-Kramers rare-earth pyrochlore Tb${}_2$ScNbO${}_7$
• Influence of controlled disorder on the dipolar spin ice state of Ho-based pyrochlores