Orbital-order-induced metal-insulator transition in La(1-x)Ca(x)MnO3.
We present evidence that the insulator-to-metal transition in La(1-x)Ca(x)MnO3 near x approximately 0.2 is driven by the suppression of coherent Jahn-Teller distortions, originating from d-type orbital ordering. The orbital-ordered state is characterized by large long-range Q2 distortions below T(O'- O*). Above T(O'- O*) we find evidence for coexistence between an orbital-ordered and an orbital-disordered state. This behavior is discussed in terms of electronic phase separation in an orbital-ordered insulating and an orbital-disordered metallic state.
Van Aken
Bas B
BB
Solid State Chemistry Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Jurchescu
Oana D
OD
Meetsma
Auke
A
Tomioka
Y
Y
Tokura
Y
Y
Palstra
Thomas T M
TT