Change of the electrical conductivity, sigma, is observed in the manganese perovskite La1-xCaxMnO3 with x=0 and 0.3 under saturation of the magnetic resonance transitions of Mn ions. This effect has the maximum in the temperature range of the magnetic phase transition of the compounds. Two contributions to the change of sigma are found. The first, dominating in LaMnO3, is an increase of sigma caused by heating of the sample under magnetic resonance. The second is a sigma decrease due to reorientation of the Mn spins, observed in La0.7Ca0.3MnO3. This work is supported by the Wihuri Foundation, Finland.
P. Schiffer, A.P. Ramirez, W. Bao, S.-W. Cheong. Phys. Rev. Lett. 75, 3336 (1995)
C. Zener. Phys. Rev. 82, 403 (1951)
P.W. Anderson, H. Hasegawa. Phys. Rev. 100, 675 (1955)
P.G. de Gennes. Phys. Rev. 118, 141 (1960)
A.J. Millis, P.B. Littlewood, B.I. Shraiman. Phys. Rev. Lett. 74, 5144 (1995)
H. Roder, J. Zang, R. Bishop. Phys. Rev. Lett. 76, 1356 (1996)
A.J. Millis, B.I. Shraiman, R. Mueller. Phys. Rev. Lett. 77, 175 (1996)
A.S. Alexandrov, A.M. Bratkovsky. Phys. Rev. Lett. 82, 141 (1999)
A.S. Alexandrov, A.M. Bratkovsky. J. Appl. Phys. 85, 4349 (1999)
S.B. Oseroff, M. Torikachvili, J. Singley, S. Ali, S.-W. Cheong, S. Schultz. Phys. Rev. B53, 6521 (1996)
C. Rettori, D. Rao, J. Singley, D. Kidwell, S.B. Oseroff, M.T. Causa, J.J. Neumeier, K.J. McClellan, S.-W. Cheong, S. Schultz. Phys. Rev. B55, 3083 (1997)
M.T. Causa, M. Tovar, A. Caneiro, F. Prado, G. Ibavnes C.A. Ramos, A. Butera, B. Alascio, X. Obradors, S. Pivnol, F. Rivadulla, C. Vazquez-Vazquez, M.A. Lopez-Quintela, J. Rivas, Y. Tokura, S.B. Oseroff. Phys. Rev. B58, 3233 (1998)
G. Papavassiliou, M. Faradis, F. Milia, A. Simopoulos, G. Kallias, M. Pissas, D. Niarchos, N. Ioannidis, C. Dimitroupoulos, J. Dolinsek. Phys. Rev. B55, 15 000 (1997)
L.S. Vlasenko, Y.V. Martynov, T. Gregorkiewicz, C.A.J. Ammerlaan. Phys. Rev. B52, 1144 (1995)
J.W. Orton. Electron Paramagnetic Resonance. ILIFFE Books Ltd., London (1968). P. 168