Jeehoon Kim, Junwei Huang, J-S Zhou, J B Goodenough, H Zheng, J F Mitchell, Alex de Lozanne
Department of Physics, University of Texas, Austin, Texas 78712, USA.
Physical review letters 2013 May 24We employed a scanning tunneling microscope to image the (001) surface topography and local density of states (LDOS) in La(2-2x)Sr(1+2x)Mn(2)O(7) (x=0.32, LSMO) single crystals below the Curie temperature (T(C)≈120 K). The LDOS maps revealed a stripelike modulation propagating along the tetragonal a axis with a wavelength of about 16 Å, which is indicative of a charge density wave (CDW). The observed CDW in the x=0.32 sample is far from the Fermi surface nesting instability as compared with the data of angle resolved photoemission spectroscopy in an x=0.40 sample. The stripe model developed previously for cuprates can explain the observed CDW in our LSMO sample, indicating that competing interactions between localized and itinerant phases are the origin of the spatial modulations present intrinsically in cuprates and manganites.
Jeehoon Kim, Junwei Huang, J-S Zhou, J B Goodenough, H Zheng, J F Mitchell, Alex de Lozanne. Observation of electronic inhomogeneity and charge density waves in a bilayer La(2-2x)Sr(1+2x)Mn2O7 single crystal. Physical review letters. 2013 May 24;110(21):217203
PMID: 23745919
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