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

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Abstract.

The resistive and magnetic properties of La1-x Ca x MnO3 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.

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Correspondence to G. Jung.

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Received: 12 May 2003, Published online: 15 October 2003

PACS:

75.47.Gk Colossal magnetoresistance - 75.47.Lx Manganites - 71.30.+h Metal-insulator transitions and other electronic transitions

G. Jung: Present address: Ben Gurion University of the Negev, also with Instytut Fizyki PAN, Warszawa, Poland

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Markovich, V., Yuzhelevski, Y., Gorodetsky, G. et al. Nonlinear properties of ferromagnetic La \(\mathsf{_{1-x}}\)Ca\(\mathsf{_{x}}\)MnO\(\mathsf{_3}\) single crystals. Eur. Phys. J. B 35, 295–300 (2003). https://doi.org/10.1140/epjb/e2003-00280-6

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