Phys. Rev. Lett. 80, 2665–2668 (1998)Phonon-Assisted Double Exchange in Perovskite ManganitesReceived 3 July 1997; published in the issue dated 23 March 1998 Measurements of the temperature dependence of the thermoelectric power and the resistivity of 18O/16O isotope-exchanged (La1-xNdx)0.7Ca0.3MnO3 samples have confirmed the existence of vibronic electronic states below Tc in the narrow range of bandwidths where static, cooperative Jahn-Teller (J-T) deformations are suppressed and dynamic J-T deformations introduce vibrational modes into the interatomic spin-spin interactions. A giant isotope effect on Tc is related to a mass-enhanced change in both the density and mobility of the mobile charge carriers at Tc. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.2665
DOI:
10.1103/PhysRevLett.80.2665
PACS:
72.15.Jf, 71.30.+h, 72.15.Gd, 75.30.Kz
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