Optical investigations of (formula presented)

Physical Review B - Condensed Matter and Materials Physics

Volumn 59, Issue 5, 1999, Pages 3793-3797

  Jung, J H ^a   Kim, K H ^a   Lee, H J ^a   Ahn, J S ^a   Hur, N J ^a   Noh, T W ^a   Kim, M S ^b   Park, J G ^b  

^a Seoul National University   (South Korea)

^b Inha University   (South Korea)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0001269079     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.59.3793     Document Type: Article

References (28)

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8. On the other hand, Ahn and Millis claimed that the magnetic contribution to charge and orbital ordering in (Formula presented) should not be as important as the lattice contribution. See K. H. Ahn and A. J. Millis, Phys. Rev. B 58, 3697 (1998).
9. For optical properties of CMR manganites, see T. W. Noh, J. H. Jung, and K. H. Kim, Physics of Manganites, edited by T. A. Kaplan and S. D. Mahanti (Plenum, New York, 1999), and references therein.
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25. There have been different interpretations on the origin of the Peak II, which is located around 1.5 eV: an interband transition from O 2p to Mn 3d levels (Ref. 16), an interatomic transition from a JT split (Formula presented) lower level to a (Formula presented) upper level (Ref. 18), and an intra-atomic transition between the JT split (Formula presented) levels (Ref. 21). Each assignment seems to have some strong and weak points. For more details, see Ref. 8. (However, the correct assignment of the origin of Peak II is not important in this paper.)
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27. N. Furukawa, Y. Moritomo, K. Hirota, and Y. Endoh, cond-mat/9808076 (unpublished).
28. Some workers used a two-fluid model to explain phase transitions in manganites. For example, see M. Jaime, P. Lin, M. B. Salamon, P. Dorsey, and M. Rubinstein, cond-mat/9808160 (unpublished). However, the two-fluid model is difficult to be applied here, since (Formula presented) experiences transitions of insulator (Formula presented) metal (Formula presented) insulator with decreasing temperature.