Hall effect and conductivity in the single crystals of La-Sr and La-Ba manganites. N . G . Bebenin 1) , R . I . Zainullina 1) , N . S . Chusheva 1) , V . V . Ustinov 1) , Ya . M . Mukovskii 2) ,
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N.G.Bebenin1),R.I.Zainullina1), N.S.Chusheva1), V.V.Ustinov1), Ya.M.Mukovskii2),
1)Institute of Metal Physics, UD RAS, Ekaterinburg, Russia2)Moscow State Steel & Alloys Institute, Moscow, Russia
1. Introduction and La-Ba manganites
2. Resistivity and Hall effect far below Curie temperature
2.1. The x<xc crystals: La0.85Sr0.15MnO3, La0.85Ba0.15MnO3, and La0.80Ba0.20MnO3
2.2. The x>xc crystals: La0.80Sr0.20MnO3, La0.75Sr0.25MnO3, and La0.72Ba0.28MnO3
3. Temperature-induced metal-semiconductor transition
4. Near TC and in the paramagnetic state
Resistivity of La and La-Ba manganites1-xSrxMnO3 and La1-xBaxMnO3 single crystals(Bebenin et al., PRB 2004, JETP 2000, J. Phys.: Condens. Matter 2005, JMMM 2006)Blue line: inverse minimum metallic conductivity, σmin-1, according to Salamon and Jaime, RMP 2001
Resistivity and thermopower data suggest that in La and La-Ba manganites0.85Sr0.15MnO3 (TC=232 K) and La0.85Ba0.15MnO3 (TC =214 K) variable range hopping (VRH) dominates below 100 K.
Resistivity and Hall mobility in La and La-Ba manganites2/3(Ca,Pb)1/3MnO3 single crystal (TC≈290 K) calculated on the base of data of Chun et al., PRB 1999.
Temperature dependence of the metallic phase volume in some lightly doped manganites derived from optical measurements (Mostovshchikova et al., PRB 2004)