Enhanced Charge Gap in the Bilayer ManganiteLa2−2xSr1+2xMn2O… | Zendy

Myung Whun KIM | Zendy; H. J. Lee | Zendy; BohmJung Yang | Zendy; Kee Hoon Kim | Zendy; Yutaka Moritomo | Zendy; Jaejun Yu | Zendy; Tae Won Noh | Zendy

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Enhanced Charge Gap in the Bilayer ManganiteLa2−2xSr1+2xMn2O…

Author(s) -

Myung Whun KIM,

H. J. Lee,

BohmJung Yang,

Kee Hoon Kim,

Yutaka Moritomo,

Jaejun Yu,

Tae Won Noh

Publication year - 2007

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.98.187201

Subject(s) - manganite , physics , condensed matter physics , ferromagnetism

We have investigated the optical conductivity spectra of La2-2xSr1+2xMn2O7 (0.3<=x<=0.5) systematically and found that for x near 0.4 the charge gap shows enhancement of up to ~0.3 eV just above the long-range magnetic ordering temperature. From comparison of this charge gap with other experimental results, we conclude that the peculiar x dependence of the charge gap cannot be understood in terms of the charge and lattice correlations only. We suggest that the unusual enhancement originates from the cooperative coupling between the short-range charge or lattice correlations and the quasi-one-dimensional energy band near the Fermi level

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