@article{oai:repo.qst.go.jp:00049162,
 author = {大和田, 謙二 and 塚田, 真也 and 福田, 竜生 and 筒井, 智嗣 and Q., R. Baron Alfred and 水木, 純一郎 and 大和, 英弘 and 安田, 直彦 and 寺内, 暉 and 大和田 謙二 and 水木 純一郎},
 journal = {Physical Review B},
 month = {Aug},
 note = {We investigated the effect of B-site randomness on the antiferroelectric/relaxor nature of the ground state by studying diffuse and inelastic X-ray scattering (IXS) from ordered- and disordered-Pb(In1/2Nb1/2)O3 (O- and D-PIN) single crystals. The diffuse scattering measurement of O-PIN shows that the ferroelectrically interactive polarization fluctuation exists even in the antiferroelectric phase above the transition temperature TN. Inelastic X-ray scattering analysis of the diffuse scattering shows that the transverse acoustic (TA) and transverse optic (TO) modes are dominant at high temperatures (∼800 K), while the central peak (CP) and TA modes, which are coupled, contribute majorly to diffuse scattering near the TN and show critical behavior toward TN. The TO mode shows no anomaly toward TN. Furthermore, the phonon spectra are broad, indicating that a strong damping mechanism exists even in the sample with weak chemical disordering, O-PIN. No clear difference between O- and D-PIN is observed above ∼500 K. The major difference between them is the property of the CP mode, which shows no drop and increases rapidly toward low temperatures in D-PIN. The CP mode is thought to be directly related to the polarization fluctuation, and it originates from the combination of Pb-flipping and the TO mode. The B-site is considered to control the antiferroelectric/ferroelectric instability of lead-based perovskite materials. Finally, the B-site randomness is discussed in terms of suppressing the AFE instability and enhancing the polarization fluctuation.},
 title = {Effect of B-site randomness on antiferroelectric/relaxor nature of ground state: diffuse and inelastic X-ray scattering study of Pb(In1/2Nb1/2)O3},
 volume = {98},
 year = {2018}
}