Neutron Scattering Study of the Phase Transition in KD_3(SeO_3)_2
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概要
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The phase transition of KD.(Se0.). has been irtvestigated by means of neutronscattering. The transverse acoustic phonon mode c<>rresponding to the Cg. stiffnessconstant (C4. TA mode) was measured along (0, 0, 4) from 4=0.025 to the zoneboundary 4=0.5. The spectral density of the C,.4 TA mode is anomalc>us for0.05<4<0.2. Above this region, the phonon jis unrenormalized and is welldefined. Below the anomalous region, the TA mode shows soft phonon behaviorwhich agrees well with the ultrasonic and the Brillc>uin scattering experiments. Theneutron result is interpreted to mean that the TA mode shows crossover behaviorthrough the regime of relaxational hydrogen motic+n. Another possible explanationof the anomalous behavior of the TA mode is coupling to a soft optical mode.A search for such a mode was performed, with negative results.
- 社団法人日本物理学会の論文
- 1980-05-15
著者
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Yamada Yasusada
College Of General Education Osaka University
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Shirane Gen
Brookhaven National Laboratory
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Shirane Gen
Brookhavcn National Laboratory Upion
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NODA Yukio
Brookhaven National Laboratory
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YOUNGBLOOD Roberto
Brookhaven National Laboratory
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Noda Yukio
Brookhaven National Laboratory:college Of General Education Osaka University
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