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dc.contributor.authorTu, Chi-Shun
dc.contributor.authorSchmidt, V. Hugo
dc.date.accessioned2016-04-12T13:32:26Z
dc.date.available2016-04-12T13:32:26Z
dc.date.issued1994-12-01
dc.identifier.citationC.-S. Tu and V.H. Schmidt, “Temperature and concentration dependences of acoustic velocity and damping in Rb1-x(ND4)xD2AsO4 mixed crystals by Brillouin backscattering,” Phys. Rev. B 50, 16167-16172 (1994).en_US
dc.identifier.issn1098-0121
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/9683
dc.description.abstractThe LA[100] (a-axis) Brillouin backscattering phonon spectra have been measured as a function of temperature (20–370 K) in the mixed ferroelectric (FE)–antiferroelectric (AFE) system Rb1−x(ND4)xD2AsO4 (DRADA-x) for ammonium concentrations x=0, 0.10, and 0.28. The Brillouin frequency shift with decreasing temperature shows hardening (positive coupling) whose steepness decreases with higher ND4 content. For RbD2AsO4 (DRDA), a Landau-Khalatnikov-like maximum (which persists in weaker form for x=0.10) was observed and the polarization relaxation time is estimated to be τ∼3.8×10−12/(Tc-T) s, where Tc is the ferroelectric transition temperature. For both x=0.10 and 0.28, a broad damping peak anomaly which is stronger in x=0.28 was observed and can be connected with the dynamic order parameter fluctuations. Taking into account earlier NMR and dielectric results, we conclude that the local structure competition between FE ordering and AFE ordering is the origin of these broad damping anomalies.en_US
dc.titleTemperature and concentration dependences of acoustic velocity and damping in Rb1−x(ND4)xD2AsO4 mixed crystals by Brillouin backscatteringen_US
dc.typeArticleen_US
mus.citation.extentfirstpage16167en_US
mus.citation.extentlastpage16172en_US
mus.citation.issue22en_US
mus.citation.journaltitlePhysical Rev. Ben_US
mus.citation.volume50en_US
mus.identifier.categoryChemical & Material Sciencesen_US
mus.identifier.categoryPhysics & Mathematicsen_US
mus.identifier.doi10.1103/PhysRevB.50.16167en_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentPhysics.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.data.thumbpage3en_US


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