Metal–insulator transition induced by oxygen isotope exchange in the magnetoresistive perovskite manganites

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Abstract

Perovskite manganites derived from LaMnO3 have recently become the subject of intensive study following the discovery of ‘colossal’ magnetoresistance (a magnetically induced change in electrical resistance of up to several orders of magnitude) in several members of this family of compounds1. The manganites exhibit a broad range of electronic and magnetic phases, ranging from low-resistance ferromagnetic metals to high-resistance insulators, which are extremely sensitive to variation of composition2, temperature and pressure3. A recent study showed that such sensitivity also extends to oxygen isotope exchange4: replacing 16O with 18O in La0.8Ca0.2MnO3 produces an unusually large change in the magnetic properties (a 21-kelvin decrease in the Curie temperature). The magnitude of this isotope shift is evidence for the essential role played by electron–phonon coupling5 in determining the transport properties of these materials. Here we show that this sensitivity to oxygen isotope exchange can be even more extreme. In its normal state, the compound La0.175Pr0.525Ca0.3MnO3 undergoes an insulator-to-metal transition as it is cooled below 95 K. But we find that, after substituting 18O for 16O, the compound remains an insulator down to 4.2 K, so providing a vivid demonstration of the importance of lattice vibrations in these materials.

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Figure 1: Temperature dependence of resistivity for La0175Pr0.525Ca0.3MnO3 ceramic samples after the first isotope exchange (18O and 16O), and after the isotope back-exchange (18O → 16O and 16O → 18O; here → means ‘replaces’).
Figure 2: Temperature dependence of resistivity for La0175Pr0.525Ca0.3MnO3 under various magnetic fields.

References

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Acknowledgements

This work was supported in part by the Russian Foundation for Basic Researches.

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Correspondence to O. Yu. Gorbenko.

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