Weak charge-lattice coupling requires reinterpretation of stripes of charge order in La1-xCaxMnO3

Details Weak charge-lattice coupling requires reinterpretation of stripes of charge order in La1-xCaxMnO3 Weak charge-lattice coupling requires reinterpretation of stripes of charge order in La1-xCaxMnO3

2003-08-27

arxiv.org/abs/cond-mat/0308581v6

Phys. Rev. Lett. 94 (2005) 097202

Physics

Condensed Matter

Strongly Correlated Electrons

Analysis and interpretation are improved and presented better

Scientific paper

10.1103/PhysRevLett.94.097202

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.

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