Electronic phase separation and charge ordering in (Sr,La)2MnO4: Indication of triplet bipolarons

Wei Bao; C. H. Chen; S. A. Carter; S. W. Cheong

doi:10.1016/0038-1098(95)00786-5

Electronic phase separation and charge ordering in (Sr,La)₂MnO₄: Indication of triplet bipolarons

Wei Bao, C. H. Chen, S. A. Carter, S. W. Cheong

School of Arts and Sciences, New High Energy Theory Center

Research output: Contribution to journal › Article › peer-review

98 Scopus citations

Abstract

Coexistence of two phases, having different in-plane dimensions, is found in the planar Sr_2-xLa_xMnO₄ for 0 x ≤ 0.38 at room temperature. Furthermore, charge ordering with modulation wave vector (Π/2, Π/2) is discovered for x=0.5 below ∼250 K. Together with transport and magnetic measurements, these results indicate that the phase separation is due to the competition between the single and the double occupancies of the Mn 3d orbitals by the doped electrons. The doubly-occupying electrons form on-site triplets which are mobile at high temperatures and form a bipolaron lattice below ∼250 K.

Original language	English (US)
Pages (from-to)	55-59
Number of pages	5
Journal	Solid State Communications
Volume	98
Issue number	1
DOIs	https://doi.org/10.1016/0038-1098(95)00786-5
State	Published - Apr 1996

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics
Materials Chemistry

Keywords

A. magnetically ordered materials
D. electron-phonon interactions
D. exchange and superexchange
D. phase transitions
D. valence fluctuations

Access to Document

10.1016/0038-1098(95)00786-5

Cite this

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title = "Electronic phase separation and charge ordering in (Sr,La)2MnO4: Indication of triplet bipolarons",

abstract = "Coexistence of two phases, having different in-plane dimensions, is found in the planar Sr2-xLaxMnO4 for 0 x ≤ 0.38 at room temperature. Furthermore, charge ordering with modulation wave vector (Π/2, Π/2) is discovered for x=0.5 below ∼250 K. Together with transport and magnetic measurements, these results indicate that the phase separation is due to the competition between the single and the double occupancies of the Mn 3d orbitals by the doped electrons. The doubly-occupying electrons form on-site triplets which are mobile at high temperatures and form a bipolaron lattice below ∼250 K.",

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author = "Wei Bao and Chen, {C. H.} and Carter, {S. A.} and Cheong, {S. W.}",

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TY - JOUR

T1 - Electronic phase separation and charge ordering in (Sr,La)2MnO4

T2 - Indication of triplet bipolarons

AU - Bao, Wei

AU - Chen, C. H.

AU - Carter, S. A.

AU - Cheong, S. W.

PY - 1996/4

Y1 - 1996/4

N2 - Coexistence of two phases, having different in-plane dimensions, is found in the planar Sr2-xLaxMnO4 for 0 x ≤ 0.38 at room temperature. Furthermore, charge ordering with modulation wave vector (Π/2, Π/2) is discovered for x=0.5 below ∼250 K. Together with transport and magnetic measurements, these results indicate that the phase separation is due to the competition between the single and the double occupancies of the Mn 3d orbitals by the doped electrons. The doubly-occupying electrons form on-site triplets which are mobile at high temperatures and form a bipolaron lattice below ∼250 K.

AB - Coexistence of two phases, having different in-plane dimensions, is found in the planar Sr2-xLaxMnO4 for 0 x ≤ 0.38 at room temperature. Furthermore, charge ordering with modulation wave vector (Π/2, Π/2) is discovered for x=0.5 below ∼250 K. Together with transport and magnetic measurements, these results indicate that the phase separation is due to the competition between the single and the double occupancies of the Mn 3d orbitals by the doped electrons. The doubly-occupying electrons form on-site triplets which are mobile at high temperatures and form a bipolaron lattice below ∼250 K.

KW - A. magnetically ordered materials

KW - D. electron-phonon interactions

KW - D. exchange and superexchange

KW - D. phase transitions

KW - D. valence fluctuations

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