Charge density wave inLa0.84Sr0.16MnO3revealed by55Mnnuclear magnetic resonance

Using ${}^{55}\mathrm{Mn}$ nuclear magnetic resonance (NMR) in ${\mathrm{La}}_{0.84}{\mathrm{Sr}}_{0.16}{\mathrm{MnO}}_{3}$ single crystal we find evidence of the charge modulated ferromagnetic state below the metal-insulator transition. The NMR line shape reveals two inequivalent Mn positions with a ratio close to 3:1, which could be attributed to the hole-poor and hole-rich sites, respectively. The difference of the hyperfine fields for two positions is about 2.3 T at 22 K, corresponding to a charge disproportionation of $\ensuremath{\sim}0.25$ electron. An additional weak contribution to the NMR spectra is detected below 90 K, which may indicate a further ordering within the hole-rich site subsystem. The NMR spectra at low-temperature phase remain motionally narrowed, i.e., the hopping time of carriers is shorter than the period of the Larmor precession of the Mn nuclear spins.