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Koumoulis D, Panopoulos N, Reyes A, et al. Direct NMR evidence of phase solitons in the spin ground state of overdoped manganites. Phys Rev Lett. 2010;104(7):077204doi: 10.1103/PhysRevLett.104.077204.
Koumoulis, D., Panopoulos, N., Reyes, A., Fardis, M., Pissas, M., Douvalis, A., Bakas, T., Argyriou, D. N., & Papavassiliou, G. (2010). Direct NMR evidence of phase solitons in the spin ground state of overdoped manganites. Physical review letters, 104(7), 077204. https://doi.org/10.1103/PhysRevLett.104.077204
Koumoulis, D, et al. "Direct NMR evidence of phase solitons in the spin ground state of overdoped manganites." Physical review letters vol. 104,7 (2010): 077204. doi: https://doi.org/10.1103/PhysRevLett.104.077204
Koumoulis D, Panopoulos N, Reyes A, Fardis M, Pissas M, Douvalis A, Bakas T, Argyriou DN, Papavassiliou G. Direct NMR evidence of phase solitons in the spin ground state of overdoped manganites. Phys Rev Lett. 2010 Feb 19;104(7):077204. doi: 10.1103/PhysRevLett.104.077204. Epub 2010 Feb 19. PMID: 20366913.
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Phys Rev Lett. 2010 Feb 19;104(7):077204. doi: 10.1103/PhysRevLett.104.077204. Epub 2010 Feb 19.

Direct NMR evidence of phase solitons in the spin ground state of overdoped manganites.

Physical review letters

D Koumoulis, N Panopoulos, A Reyes, M Fardis, M Pissas, A Douvalis, T Bakas, D N Argyriou, G Papavassiliou

Affiliations

  1. Institute of Materials Science, NCSR, Demokritos, 153 10 Aghia Paraskevi, Athens, Greece.

PMID: 20366913 DOI: 10.1103/PhysRevLett.104.077204

Abstract

Charge ordering phenomena in overdoped La1-xCaxMnO3 (LCMO) manganites with x>or=0.5 are generally believed to be associated with the formation of charge stripes composed of alternating Mn3+ and Mn4+ charges. However, a number of recent experiments indicate that instead of stripes the charge in these systems is spatially organized in a uniform charge density wave. At the same time theory predicts that the ground state is modulated by an incommensurate (IC) orbital and charge soliton lattice. Here, by using nuclear magnetic resonance we provide the first direct evidence that the spin ground state in overdoped LCMO manganites is IC modulated with phase solitons. At higher temperatures the solitonic superstructure is replaced by a uniform spin-density wave, subjected to coherent slow fluctuations, showing a striking similarity with slow fluctuations in the striped phase of high T{c} cuprates and nickelates.

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