Order parameter segregation in Ce0.7La0.3B6: 4f octopole and 5d dipole magnetic order.

摘要: The intriguing thermophysical properties of ${\mathrm{CeB}}_{6}$ have been subject to investigation for more than 20 years. In particular, an exotic ground state, phase IV, emerges under doping with La. We report resonant x-ray scattering results on the order parameter symmetries in IV ${\mathrm{Ce}}_{0.7}{\mathrm{La}}_{0.3}{\mathrm{B}}_{6}$, which condenses below ${T}_{\mathrm{IV}}=1.5\text{ }\text{ }\mathrm{K}$. reveal a degree mesoscopic $5d$ dipole antiferromagnetic order, propagation vector ${Q}_{0}=(\frac{1}{2}\frac{1}{2}\frac{1}{2})$, both and above ${T}_{\mathrm{IV}}$. Below ${T}_{\mathrm{IV}}$, this polarization coexists long-range $4f$ antiferro-octupole (AFO) also at ${Q}_{0}$. marked differences temperature dependence spatial correlation suggest state segregation low temperature. A simple model AFO consistent dependent azimuth symmetries, Bragg angle, is given.