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Anomalous High-Pressure Jahn-Teller Behavior in CuWO_{4}.
MedLine Citation:
PMID:  22680738     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
High-pressure optical-absorption measurements performed in CuWO_{4} up to 20 GPa provide experimental evidence of the persistence of the Jahn-Teller (JT) distortion in the whole pressure range both in the low-pressure triclinic and in the high-pressure monoclinic phase. The electron-lattice couplings associated with the e_{g}(E⊗e) and t_{2g}(T⊗e) orbitals of Cu^{2+} in CuWO_{4} are obtained from correlations between the JT distortion of the CuO_{6} octahedron and the associated structure of Cu^{2+} d-electronic levels. This distortion and its associated JT energy (E_{JT}) decrease upon compression in both phases. However, both the distortion and associated E_{JT} increase sharply at the phase-transition pressure (P_{PT}=9.9  GPa), and we estimate that the JT distortion persists for a wide pressure range not being suppressed up to 37 GPa. These results shed light on the transition mechanism of multiferroic CuWO_{4}, suggesting that the pressure-induced structural phase transition is a way to minimize the distortive effects associated with the toughness of the JT distortion.
Authors:
J Ruiz-Fuertes; A Segura; F Rodríguez; D Errandonea; M N Sanz-Ortiz
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Publication Detail:
Type:  Journal Article     Date:  2012-04-18
Journal Detail:
Title:  Physical review letters     Volume:  108     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-06-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  166402     Citation Subset:  IM    
Affiliation:
MALTA Consolider Team and Departamento de Física Aplicada-ICMUV, Universitat de València, Edificio de Investigación, c/ Dr. Moliner 50, 46100 Burjassot, Valencia, Spain.
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