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000168378 1001_ $$0P:(DE-H253)PIP1008206$$aRichter, Carsten$$b0
000168378 245__ $$aMechanisms of the paraelectric to ferroelectric phase transition in $RbH_{2}PO_{4}$ probed by purely resonant x-ray diffraction
000168378 260__ $$aCollege Park, Md.$$bAPS$$c2014
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000168378 520__ $$aResonant x-ray diffraction was used to study the proton jumps in hydrogen-bonded rubidium dihydrogen phosphate (RDP) crystals. In the paraelectric RDP phase, hydrogen is delocalized between two crystallographically equivalent positions. At lower temperatures, this symmetry can be broken, which defines the processes that lead to the para- to ferroelectric phase transition. We have measured the energy spectra of the forbidden reflections 006 and 550 at incident radiation energies close to the Rb K edge in a wide temperature range, down to the temperature of the ferroelectric phase transition. In the paraelectric phase, we observed a growth of integrated intensity for both forbidden reflections with temperature. This behavior is opposite to conventional nonresonant Bragg reflections, where intensity decreases in accordance with the Debye-Waller factor. The developed theoretical model explains this effect with the thermal motion induced (TMI) scattering mechanism and also confirms the adiabatic approximation stating that electrons instantly follow the nuclei movements. In the 550 energy spectra, we have observed an additional contribution to the resonant structure factor, which could be associated with the presence of transient Slater-type proton configurations (PC) in the half-filled hydrogen position.
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000168378 7001_ $$0P:(DE-H253)PIP1001864$$aNovikov, Dmitri$$b1$$eCorresponding Author
000168378 7001_ $$0P:(DE-H253)PIP1012559$$aMukhamedzhanov, Enver$$b2
000168378 7001_ $$0P:(DE-HGF)0$$aBorisov, M. M.$$b3
000168378 7001_ $$0P:(DE-HGF)0$$aAkimova, K. A.$$b4
000168378 7001_ $$0P:(DE-H253)PIP1012547$$aOvchinnikova, Elena$$b5
000168378 7001_ $$0P:(DE-H253)PIP1010709$$aOreshko, Alexey$$b6
000168378 7001_ $$0P:(DE-H253)PIP1005520$$aStrempfer, Joerg$$b7
000168378 7001_ $$0P:(DE-H253)PIP1008273$$aZschornak, Matthias$$b8
000168378 7001_ $$0P:(DE-H253)PIP1013176$$aMehner, Erik$$b9
000168378 7001_ $$0P:(DE-H253)PIP1010439$$aMeyer, Dirk C.$$b10
000168378 7001_ $$0P:(DE-HGF)0$$aDmitrienko, V. E.$$b11
000168378 77318 $$2Crossref$$3journal-article$$a10.1103/physrevb.89.094110$$bAmerican Physical Society (APS)$$d2014-03-27$$n9$$p094110$$tPhysical Review B$$v89$$x1098-0121$$y2014
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