  Modulations in manganites attributed to stripes of charge/orbital/spin order
are thought to result from strong electron-lattice interactions that lock the
superlattice and parent lattice periodicities. Surprisingly in
La1-xCaxMnO3(x>0.5, 90 K), convergent beam (3.6 nm spot) electron diffraction
patterns rule out charge stacking faults and indicate a superlattice with
uniform periodicity. Moreover, large area electron diffraction peaks are
sharper than simulations with stacking faults. Since the electron-lattice
coupling does not lock the two periodicities (to yield stripes) it may be too
weak to strongly localise charge.
