Resonant Enhancement of Charge Density Wave Diffraction in the Rare-Earth Tritellurides
| Autor: | Ming Yi, Zahid Hussain, Brian Moritz, Wanli Yang, Zhi-Xun Shen, Wei-Sheng Lee, Hsueh-Hui Kuo, Jiun-Haw Chu, Thomas P. Devereaux, A. G. Cruz Gonzalez, Yi-De Chuang, Ian R. Fisher, A. P. Sorini |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Physics
Diffraction Valence (chemistry) Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics FOS: Physical sciences Charge density Condensed Matter Physics Electronic Optical and Magnetic Materials Ion Condensed Matter - Strongly Correlated Electrons Absorption edge X-ray crystallography Strongly correlated material Condensed Matter::Strongly Correlated Electrons Atomic physics Charge density wave |
| Popis: | We performed resonant soft X-ray diffraction on known charge density wave (CDW) compounds, rare earth tri-tellurides. Near the $M_5$ (3d - 4f) absorption edge of rare earth ions, an intense diffraction peak is detected at a wavevector identical to that of CDW state hosted on Te$_2$ planes, indicating a CDW-induced modulation on the rare earth ions. Surprisingly, the temperature dependence of the diffraction peak intensity demonstrates an exponential increase at low temperatures, vastly different than that of the CDW order parameter. Assuming 4f multiplet splitting due to the CDW states,we present a model to calculate X-ray absorption spectrum and resonant profile of the diffraction peak, agreeing well with experimental observations. Our results demonstrate a situation where the temperature dependence of resonant X-ray diffraction peak intensity is not directly related to the intrinsic behavior of the order parameter associated with the electronic order, but is dominated by the thermal occupancy of the valence states. 7 pages, 5 figures |
| Databáze: | OpenAIRE |
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