Enhanced lattice fluctuations prior to a nonmagnetic ferroelectric order in an ionic spin-chain system

Keishi Sunami, Tomohiro Baba, Kazuya Miyagawa +2

We investigated microscopic lattice states in the donor-acceptor ionic Mott insulator, TTF-BA, by ${}^{79}$Br-NQR spectroscopy to explore cross-correlated fluctuations between spin,…