Spin polarons in La1-x Srx CoO3 single crystals

R. X. Smith, M. J R Hoch, P. L. Kuhns, W. G. Moulton, A. P. Reyes, G. S. Boebinger, J. Mitchell, C. Leighton

Research output: Contribution to journalArticle

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Abstract

Nanoscale inhomogeneity in La1-x Srx CoO3 has been investigated in single-crystal samples for 0.05≤x≤0.30 using L 139 a and C 59 o NMR to probe local magnetization. In contrast to polycrystalline samples, single crystals exhibit ferromagnetism only above the metal-insulator critical concentration xC =0.17. However, over the entire doping range, the single crystals exhibit an unusually broad and asymmetric distribution of hyperfine fields, evidencing (local) spin-polaron formation that persists to temperatures as high as 200 K, well above the glass transition reported previously from bulk magnetization. Above xC the asymmetry decreases rapidly with increasing doping as polarons overlap to give rise to long-range ferromagnetism. A modified phase diagram is presented. The key features of the data are reproduced by a simple model in which Sr dopants trigger spin-polaron formation, a physical picture first proposed by de Gennes [Phys. Rev. 118, 141 (1960)].

Original languageEnglish (US)
Article number092201
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number9
DOIs
StatePublished - Sep 12 2008

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Polarons
polarons
Gene Conversion
Ferromagnetism
Doping (additives)
Single crystals
ferromagnetism
Magnetization
single crystals
magnetization
Phase diagrams
Glass transition
inhomogeneity
actuators
Metals
phase diagrams
Nuclear magnetic resonance
asymmetry
insulators
nuclear magnetic resonance

Cite this

Smith, R. X., Hoch, M. J. R., Kuhns, P. L., Moulton, W. G., Reyes, A. P., Boebinger, G. S., ... Leighton, C. (2008). Spin polarons in La1-x Srx CoO3 single crystals. Physical Review B - Condensed Matter and Materials Physics, 78(9), [092201]. https://doi.org/10.1103/PhysRevB.78.092201

Spin polarons in La1-x Srx CoO3 single crystals. / Smith, R. X.; Hoch, M. J R; Kuhns, P. L.; Moulton, W. G.; Reyes, A. P.; Boebinger, G. S.; Mitchell, J.; Leighton, C.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 78, No. 9, 092201, 12.09.2008.

Research output: Contribution to journalArticle

Smith, RX, Hoch, MJR, Kuhns, PL, Moulton, WG, Reyes, AP, Boebinger, GS, Mitchell, J & Leighton, C 2008, 'Spin polarons in La1-x Srx CoO3 single crystals', Physical Review B - Condensed Matter and Materials Physics, vol. 78, no. 9, 092201. https://doi.org/10.1103/PhysRevB.78.092201
Smith RX, Hoch MJR, Kuhns PL, Moulton WG, Reyes AP, Boebinger GS et al. Spin polarons in La1-x Srx CoO3 single crystals. Physical Review B - Condensed Matter and Materials Physics. 2008 Sep 12;78(9). 092201. https://doi.org/10.1103/PhysRevB.78.092201
Smith, R. X. ; Hoch, M. J R ; Kuhns, P. L. ; Moulton, W. G. ; Reyes, A. P. ; Boebinger, G. S. ; Mitchell, J. ; Leighton, C. / Spin polarons in La1-x Srx CoO3 single crystals. In: Physical Review B - Condensed Matter and Materials Physics. 2008 ; Vol. 78, No. 9.
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