Fig. 1: Crystal/magnetic structure and experimental phase diagram of the pyrochlore iridates.
From: Spectrally sharp magnetic excitations above the critical temperature in a frustrated Weyl semimetal
a The pyrochlore lattice features two interpenetrating sublattices of corner-sharing tetrahedra. In the ordered ground state, possible spin configurations include “two-in-two-out” (red arrows), as in the titanates, or “four-in-four-out” (blue arrows), as in the iridates. b The low-temperature electronic and magnetic phases are well-established for pyrochlore iridates with larger ionic radii (Pr-Eu). The phase diagram features optical and charge gap39, SQUID40,41,42,43, REXS38,44,45, and torque magnetometry46 data. For smaller A-site radii, spectroscopic studies are limited due to the lack of availability of large-size single crystals. μSR data indicate the presence of a quantum cooperative paramagnet regime for Y2Ir2O7 (YIO) and Nd2Ir2O747,48. The XRMS data on YIO is revealed for the first time in this manuscript.
