TY - JOUR
T1 - Order parameter segregation in Ce0.7La0.3B6
T2 - 4f octopole and 5d dipole magnetic order
AU - Mannix, D.
AU - Tanaka, Y.
AU - Carbone, D.
AU - Bernhoeft, N.
AU - Kunii, S.
PY - 2005/9/9
Y1 - 2005/9/9
N2 - The intriguing thermophysical properties of CeB6 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 phase IV of Ce0.7La0.3B6, which condenses below TIV=1.5K. The results reveal a degree of mesoscopic 5d dipole antiferromagnetic order, with propagation vector Q0=(121212), both below and above TIV. Below TIV, this polarization coexists with long-range 4f antiferro-octupole (AFO) order also at Q0. The marked differences in temperature dependence and spatial correlation suggest a state of order parameter segregation at low temperature. A simple model of AFO order, consistent with the polarization dependent azimuth symmetries, the Bragg angle, and temperature dependence is given.
AB - The intriguing thermophysical properties of CeB6 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 phase IV of Ce0.7La0.3B6, which condenses below TIV=1.5K. The results reveal a degree of mesoscopic 5d dipole antiferromagnetic order, with propagation vector Q0=(121212), both below and above TIV. Below TIV, this polarization coexists with long-range 4f antiferro-octupole (AFO) order also at Q0. The marked differences in temperature dependence and spatial correlation suggest a state of order parameter segregation at low temperature. A simple model of AFO order, consistent with the polarization dependent azimuth symmetries, the Bragg angle, and temperature dependence is given.
U2 - 10.1103/PhysRevLett.95.117206
DO - 10.1103/PhysRevLett.95.117206
M3 - Article
AN - SCOPUS:27144499168
SN - 0031-9007
VL - 95
JO - Physical Review Letters
JF - Physical Review Letters
IS - 11
M1 - 117206
ER -