Please use this identifier to cite or link to this item:
|Title:||Quadrupolar waves in Uranium Dioxide|
|Authors:||CARRETTA S.; SANTINI P.; CACIUFFO Roberto; AMORETTI G.|
|Citation:||PHYSICAL REVIEW LETTERS vol. 105 no. 16 p. 167201 (1-4)|
|Publisher:||AMER PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||The presence of active orbital degrees of freedom in open electronic shells leads to an extremely rich phenomenology which has been explored and understood only partially. In particular, multipolar moments may play a key role in determining static and dynamical properties and may even be order parameters in phase transitions. In this case, elementary excitations around the broken symmetry state include multipolar waves, but none of these exotic dispersive excitation branches has ever been identified. This has hampered to reach a satisfactory understanding of the microscopic mechanisms governing this rich physics. We show that quadrupolar waves constitute a major component of the dynamics of uranium dioxide and that many unexplained features in existing data, including a whole excitation branch, are associated with propagating quadrupolar fluctuations driven jointly by magnetoelastic and superexchange multipolar interactions. These results enable a remarkable insight into the physics of orbital degrees of freedom.|
|JRC Directorate:||Nuclear Safety and Security|
Files in This Item:
There are no files associated with this item.
Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.