Evidence for magnetic polarons in hole-doped cobalt perovskites

A. Podlesnyak; A. Furrer; Th Strässle; E. Pomjakushina; K. Conder; D. I. Khomskii

Evidence for magnetic polarons in hole-doped cobalt perovskites

A. Podlesnyak, A. Furrer, Th Strässle, E. Pomjakushina, K. Conder, D. I. Khomskii

Direct Geometry

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

A substitution of La₃₊ by Sr₂₊ in LaCoO₃ induces holes in the low-spin ground state of the. Co ions, which behave like magnetic impurities with a very high spin value (13 μ_B per hole). In this work, using single-crystal neutron spectroscopy, we prove that the charges introduced by strontium doping do not remain localized at the cobalt sites. Instead, each hole not only creates Co⁴⁺ in low-spin state, but it also transforms the six nearest neighboring Co³⁺ ions to the intermediate-spin state thereby forming a magnetic seven-site (heptamer) polaron. Spin-state polarons behave like magnetic nanoparticles embedded in an insulating nonmagnetic matrix. Therefore, lightly doped La_1-xSr _xCoO₃ is a natural analog to artificial structures composed of ferromagnetic particles in insulating matrices.

Original language	English
Title of host publication	Multifunctional Nanoparticle Systems - Coupled Behavior and Applications
Pages	165-170
Number of pages	6
State	Published - 2010
Event	2010 MRS Spring Meeting - San Francisco, CA, United States Duration: Apr 5 2010 → Apr 9 2010

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	1257
ISSN (Print)	0272-9172

Conference

Conference	2010 MRS Spring Meeting
Country/Territory	United States
City	San Francisco, CA
Period	04/5/10 → 04/9/10

Cite this

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title = "Evidence for magnetic polarons in hole-doped cobalt perovskites",

abstract = "A substitution of La3+ by Sr2+ in LaCoO3 induces holes in the low-spin ground state of the. Co ions, which behave like magnetic impurities with a very high spin value (13 μB per hole). In this work, using single-crystal neutron spectroscopy, we prove that the charges introduced by strontium doping do not remain localized at the cobalt sites. Instead, each hole not only creates Co4+ in low-spin state, but it also transforms the six nearest neighboring Co3+ ions to the intermediate-spin state thereby forming a magnetic seven-site (heptamer) polaron. Spin-state polarons behave like magnetic nanoparticles embedded in an insulating nonmagnetic matrix. Therefore, lightly doped La1-xSr xCoO3 is a natural analog to artificial structures composed of ferromagnetic particles in insulating matrices.",

author = "A. Podlesnyak and A. Furrer and Th Str{\"a}ssle and E. Pomjakushina and K. Conder and Khomskii, {D. I.}",

year = "2010",

language = "English",

isbn = "9781605112343",

series = "Materials Research Society Symposium Proceedings",

pages = "165--170",

booktitle = "Multifunctional Nanoparticle Systems - Coupled Behavior and Applications",

note = "2010 MRS Spring Meeting ; Conference date: 05-04-2010 Through 09-04-2010",

}

Podlesnyak, A, Furrer, A, Strässle, T, Pomjakushina, E, Conder, K & Khomskii, DI 2010, Evidence for magnetic polarons in hole-doped cobalt perovskites. in Multifunctional Nanoparticle Systems - Coupled Behavior and Applications. Materials Research Society Symposium Proceedings, vol. 1257, pp. 165-170, 2010 MRS Spring Meeting, San Francisco, CA, United States, 04/5/10.

Evidence for magnetic polarons in hole-doped cobalt perovskites. / Podlesnyak, A.; Furrer, A.; Strässle, Th et al.
Multifunctional Nanoparticle Systems - Coupled Behavior and Applications. 2010. p. 165-170 (Materials Research Society Symposium Proceedings; Vol. 1257).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Evidence for magnetic polarons in hole-doped cobalt perovskites

AU - Podlesnyak, A.

AU - Furrer, A.

AU - Strässle, Th

AU - Pomjakushina, E.

AU - Conder, K.

AU - Khomskii, D. I.

PY - 2010

Y1 - 2010

N2 - A substitution of La3+ by Sr2+ in LaCoO3 induces holes in the low-spin ground state of the. Co ions, which behave like magnetic impurities with a very high spin value (13 μB per hole). In this work, using single-crystal neutron spectroscopy, we prove that the charges introduced by strontium doping do not remain localized at the cobalt sites. Instead, each hole not only creates Co4+ in low-spin state, but it also transforms the six nearest neighboring Co3+ ions to the intermediate-spin state thereby forming a magnetic seven-site (heptamer) polaron. Spin-state polarons behave like magnetic nanoparticles embedded in an insulating nonmagnetic matrix. Therefore, lightly doped La1-xSr xCoO3 is a natural analog to artificial structures composed of ferromagnetic particles in insulating matrices.

AB - A substitution of La3+ by Sr2+ in LaCoO3 induces holes in the low-spin ground state of the. Co ions, which behave like magnetic impurities with a very high spin value (13 μB per hole). In this work, using single-crystal neutron spectroscopy, we prove that the charges introduced by strontium doping do not remain localized at the cobalt sites. Instead, each hole not only creates Co4+ in low-spin state, but it also transforms the six nearest neighboring Co3+ ions to the intermediate-spin state thereby forming a magnetic seven-site (heptamer) polaron. Spin-state polarons behave like magnetic nanoparticles embedded in an insulating nonmagnetic matrix. Therefore, lightly doped La1-xSr xCoO3 is a natural analog to artificial structures composed of ferromagnetic particles in insulating matrices.

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M3 - Conference contribution

AN - SCOPUS:79951615103

SN - 9781605112343

T3 - Materials Research Society Symposium Proceedings

SP - 165

EP - 170

BT - Multifunctional Nanoparticle Systems - Coupled Behavior and Applications

T2 - 2010 MRS Spring Meeting

Y2 - 5 April 2010 through 9 April 2010

ER -

Evidence for magnetic polarons in hole-doped cobalt perovskites

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