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Titolo:
Magnetic, electronic, dielectric and optical properties of Pr(Ca : Sr)MnO3
Autore:
Sichelschmidt, J; Paraskevopoulos, M; Brando, T; Wehn, R; Ivannikov, D; Mayr, F; Pucher, K; Hemberger, J; Pimenov, A; von Nidda, HAK; Lunkenheimer, P; Ivanov, VY; Mukhin, AA; Balbashov, AM; Loidl, A;
Indirizzi:
Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany Max Planck InstChem Phys Solids Dresden Germany D-01187 resden, Germany Univ Augsburg, D-86135 Augsburg, Germany Univ Augsburg Augsburg Germany D-86135 gsburg, D-86135 Augsburg, Germany Russian Acad Sci, Inst Gen Phys, Moscow 105835, Russia Russian Acad Sci Moscow Russia 105835 st Gen Phys, Moscow 105835, Russia Moscow Power Engn Inst, Moscow 105835, Russia Moscow Power Engn Inst Moscow Russia 105835 Inst, Moscow 105835, Russia
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL B
fascicolo: 1, volume: 20, anno: 2001,
pagine: 7 - 17
SICI:
1434-6028(200103)20:1<7:MEDAOP>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
INSULATOR-METAL TRANSITION; AC CONDUCTIVITY; COLOSSAL MAGNETORESISTANCE; NEUTRON-DIFFRACTION; MANGANESE OXIDES; SOLID-STATE; CHARGE; PR1-XCAXMNO3; SPIN; FIELD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Sichelschmidt, J Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany Max Planck Inst Chem Phys Solids Dresden Germany D-01187
Citazione:
J. Sichelschmidt et al., "Magnetic, electronic, dielectric and optical properties of Pr(Ca : Sr)MnO3", EUR PHY J B, 20(1), 2001, pp. 7-17

Abstract

The charge-ordered perovskite Pr0.65Ca0.28S0.07MnO3 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 spectralregime. 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.

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Documento generato il 30/09/20 alle ore 09:24:27