2003/08/31 by J. C. Loudon, S. Cox, A. J. Williams +4
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.94.097202
published as Phys. Rev. Lett. 94 (2005) 097202 · Analysis and interpretation are improved and presented better
arxiv created 2005/01/26 · arxiv updated 2009/12/01
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.