Nonlinear properties of ferromagnetic La $\mathsf{_{1-x}}$ Ca $\mathsf{_{x}}$ MnO $\mathsf{_3}$ single crystals

V. Markovich, Y. Yuzhelevski, G. Gorodetsky, G. Jung (), C. Beek and Ya Mukovskii

The European Physical Journal B: Condensed Matter and Complex Systems, 2003, vol. 35, issue 3, 295-300

Abstract: The resistive and magnetic properties of La 1-x Ca x MnO 3 single crystals are investigated. In particular, properties of close-to-critically doped crystals with x=0.22 are confronted with those of underdoped crystals with x=0.18 and x=0.2 and optimally doped crystals with x=0.3. A systematic investigation of nonlinear transport shows that the critically doped crystal does not simply constitute an intermediate case between strongly nonlinear underdoped and linear, optimally doped one. The observed low-temperature resistivity increase can be interpreted in terms of orbital ordering or as a manifestation of an intrinsic tunnelling mechanism. The transport measurements have been completed by magneto-optic investigations which suggest that the low temperature resistivity of the underdoped x=0.18 compound is dominated by tunnelling through intrinsic barriers associated with twin domains, while phase separation dominates in the critically doped x=0.22 compound. Copyright Springer-Verlag Berlin/Heidelberg 2003

Date: 2003
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DOI: 10.1140/epjb/e2003-00280-6

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