High-Pressure Routes to New Pyrochlores and Novel Magnetism

Inorganics

ChristopherR. Wiebe¹  Haidong Zhou² 

[1] Department of Chemistry, University of Winnipeg, Winnipeg, MB R3B 2E2, Canada;Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, USA;

关键词: geometrically frustrated magnetism;    high-pressure synthesis;    magnetic oxides;   

DOI  :  10.3390/inorganics7040049

来源: DOAJ

【 摘 要 】

The pyrochlore structure (A₂B₂O₇) has been an object of consistent study by materials scientists largely due to the stability of the cubic lattice with respect to a wide variety of chemical species on the A or B sites. The criterion for stability under ambient conditions is controlled by the ratio of these cations, which is empirically 1.36 < R_A/R_B < 1.71. However, under applied pressure synthesis conditions, the pyrochlore lattice is stable up to R_A/R_B ∼ 2.30, opening up possibilities for new compounds. In this review, we will highlight recent work in exploring new rare-earth pyrochlores such as the germanates RE₂Ge₂O₇ and platinates RE₂Pt₂O₇. We highlight recent discoveries made in these pyrochlores such as highly correlated spin ice behavior, spin liquid ground states, and exotic magnetic ordering.

【 授权许可】

Unknown