Cooperative Jahn–Teller effect on the X-ray diffraction spectra in DyB2C2

✍ Scribed by T. Nagao; J. Igarashi

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 235 KB
• Volume: 345
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2003.11.023

✦ Synopsis

To investigate the effect of the lattice distortion on the resonant X-ray scattering (RXS) spectra in DyB 2 C 2 ; we study the crystal electric field Hamiltonian to fit the low-lying level scheme. By using the quasi-quartet ground states of the Hamiltonian, we analyze the cooperative Jahn-Teller effect at absolute zero. We find that a certain type of buckling of sheets of B and C atoms is an energetically favored state. This naturally leads to a canted quadrupolar ordering phase consistent with the experiment. We show that the obtained lattice distortion gives rise to large intensities on RXS spectra around the Dy L III edge by modulating the 5d bands.