Magnetic, electronic, dielectric and optical properties of Pr(Ca:Sr)MnO 3

J. Sichelschmidt, M. Paraskevopoulos, M. Brando, R. Wehn, D. Ivannikov, F. Mayr, K. Pucher, J. Hemberger, A. Pimenov, H.-A. Krug von Nidda, P. Lunkenheimer, V.Yu. Ivanov, A.A. Mukhin, A.M. Balbashov and A. Loidl
Additional contact information
J. Sichelschmidt: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
M. Paraskevopoulos: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany
M. Brando: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany
R. Wehn: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany
D. Ivannikov: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany
F. Mayr: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany
K. Pucher: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany
J. Hemberger: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany
A. Pimenov: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany
H.-A. Krug von Nidda: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany
P. Lunkenheimer: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany
V.Yu. Ivanov: General Physics Institute, Russian Academy of Sciences, 105835 Moscow, Russia
A.A. Mukhin: General Physics Institute, Russian Academy of Sciences, 105835 Moscow, Russia
A.M. Balbashov: Moscow Power Engineering Institute, 105835 Moscow, Russia
A. Loidl: Experimentalphysik V, Universität Augsburg, 86135 Augsburg, Germany

The European Physical Journal B: Condensed Matter and Complex Systems, 2001, vol. 20, issue 1, 7-17

Abstract: Abstract: The charge-ordered perovskite Pr0.65Ca0.28Sr0.07MnO3 was investigated by means of magnetic susceptibility, specific heat, dielectric and optical spectroscopy and electron-spin resonance techniques. Under moderate magnetic fields, the charge order melts yielding colossal magnetoresistance effects with changes of the resistivity over eleven orders of magnitude. The optical conductivity is studied from audio frequencies far into the visible spectral regime. Below the phonon modes hopping conductivity is detected. Beyond the phonon modes the optical conductivity is explained by polaronic excitations out of a bound state. ESR techniques yield detailed informations on the (H,T ) phase diagram and reveal a broadening of the linewidth which can be modeled in terms of activated polaron hopping.

Keywords: PACS.; 63.20.-e; Phonons; in; crystal; lattices; –; 71.30.+h; Metal-insulator; transitions; and; other; electronic; transitions; –; 72.60.+g; Mixed; conductivity; and; conductivity; transitions; –; 78.30.-j; Infrared; and; Raman; spectra (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/s100510170280

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