TbReO3 (Re3+ = Y3+, Gd3+, Lu3+): Structural Protected Octahedron for Designing Cubic Sesquioxide Magneto-Optical Crystals with Large Verdet Constant and High Thermal Conductivity

Le résumé fourni par la source

Magneto-optical (M-O) crystals hold significant promise for broad applications in optical communications, high-energy lasers, and optical storage. However, with the advancement of high-power laser systems, commercial M-O crystals face challenges in simultaneously meeting the requirements for a high Verdet constant, high thermal conductivity, and high structural symmetry, which limits their practical utility. In this study, we designed a novel M-O crystal based on the sesquioxide family, featuring a structurally protected [(Tb/Re)O 6 ] (Re 3+ = Y 3+, Gd 3+, Lu 3+ ) octahedron. This design preserves the cubic crystal system and minimizes local crystal field distortion, leading to reduced unit cell parameters and a shorter phonon mean free path. These characteristics are conducive to enhancing both the Verdet constant and thermal conductivity. TbReO 3 (Re 3+ = Y 3+, Lu 3+ ) crystals were successfully grown by using the laser floating zone method. The cubic TbReO 3 (Re 3+ = Y 3+, Lu 3+ ) crystals exhibit Verdet constants of 242 rad·m –1 ·T –1 and 241 rad·m –1 ·T –1 at 633 nm, and thermal conductivities of 11.8 W·m –1 ·K –1 and 11.9 W·m –1 ·K –1, respectively. These experimental results are in agreement with theoretical calculations of the electron localization function (ELF). This design strategy enables the synergistic optimization of magneto-optical and thermal properties within a highly symmetric system, offering new perspectives for the development of M-O crystals.

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