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19 April 2024 |
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Soft x-ray resonant diffraction study of magnetic and orbital correlations in a manganite near half-doping | | K. J. Thomas
; J. P. Hill
; Y-J. Kim
; S. Grenier
; P. Abbamonte
; L. Venema
; A. Rusydi
; Y. Tomioka
; Y. Tokura
; D. F. McMorrow
; M. van Veenendaal
; | | Date: |
24 Nov 2003 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | We have utilized the resonant x-ray diffraction technique at the Mn L-edge in order to directly compare magnetic and orbital correlations in the Mn sub-lattice of Pr0.6Ca0.4MnO3. The resonant line shape is measured below T_OO ~ 240 K at the orbital ordering wave vector (0,1/2,0), and below T_N ~ 175 K at the antiferromagnetic wave vector (1/2,0,0). Comparing the width of the super-lattice peaks at the two wavevectors, we find that the correlation length of the magnetism exceeds that of the orbital order by nearly a factor of two. Furthermore, we observe a large (~ 3 eV) shift in spectral weight between the magnetic and orbital line shapes, which cannot be explained within the classic Goodenough picture of a charge-ordered ground state. To explain the large shift, we calculate the resonant line shapes for orbital and magnetic diffraction based on a relaxed charge-ordered model. | | Source: | arXiv, cond-mat/0311553 | | Services: | Forum | Review | PDF | Favorites | |
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