Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-05-06
Physics
Condensed Matter
Strongly Correlated Electrons
4 Pages, 3 Figures, submitted to Phys. Rev. Lett. v2: resubmitted after referee reports
Scientific paper
10.1103/PhysRevLett.89.187202
We report the results of resonant X-ray scattering experiments performed at the Np M_4,5 edges in NpO_2. Below T_0 = 25 K, the development of long-range order of Np electric quadrupoles is revealed by the growth of superlattice Bragg peaks. The electronic transition is not accompanied by any measurable crystallographic distortion, either internal or external, so the symmetry of the system remains cubic. The polarization and azimuthal dependence of the intensity of the resonant peaks is well reproduced assuming Templeton scattering from a triple-q longitudinal antiferroquadrupolar structure. Electric quadrupole order in NpO_2 could be driven by the ordering at T_0 of magnetic octupoles of Gamma_5 symmetry, splitting the Np ground state quartet and leading to a singlet ground state with zero dipole magnetic moment.
Bernhoeft N.
Caciuffo R.
Detlefs Carsten
Lander G. H.
Longfield M. J.
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Original paper that solved a 50 years long mystery concerning a low temperature phase transition in NpO2.
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