Structural origin of the pseudo-two-dimensional metallic state in the A-type antiferromagnetic manganites

Joonghoe Dho; E. O. Chi; W. S. Kim; N. H. Hur; Y. N. Choi

doi:10.1103/PhysRevB.65.132414

Structural origin of the pseudo-two-dimensional metallic state in the A-type antiferromagnetic manganites

Joonghoe Dho, E. O. Chi, W. S. Kim, N. H. Hur, Y. N. Choi

Department of Physics

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

8 Scopus citations

Abstract

The interplay between the structure and A-type spin ordering in La_0.46Sr_0.54 Mn_0.98Cr_0.02O₃ (LSMO) has been studied using neutron powder diffraction. The antiferromagnetic transition is accompanied by a structural transition from tetragonal I4/mcm with lattice constant a=c≪b/√2 to monoclinic P2₁/n with b/√2≪a≈c (β≈90.4°). Moreover, the first-order A-type spin ordering is characterized by a two-dimensional-like (2D-like) anisotropic structural distortion [Δ(a,c)≈ + 1.05 %, Δb/√2≈ -2.2%] and the unusual volume discontinuity (ΔV≈0.13%). These results demonstrate that the pseudo-2D metallic state in LSMO can be realized by a 2D-like anisotropic lattice distortion correlated with the A-type spin ordering and the d_x2-y2 orbital ordering.

Original language	English
Article number	132414
Pages (from-to)	1324141-1324144
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.65.132414
State	Published - 1 Apr 2002

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title = "Structural origin of the pseudo-two-dimensional metallic state in the A-type antiferromagnetic manganites",

abstract = "The interplay between the structure and A-type spin ordering in La0.46Sr0.54 Mn0.98Cr0.02O3 (LSMO) has been studied using neutron powder diffraction. The antiferromagnetic transition is accompanied by a structural transition from tetragonal I4/mcm with lattice constant a=c≪b/√2 to monoclinic P21/n with b/√2≪a≈c (β≈90.4°). Moreover, the first-order A-type spin ordering is characterized by a two-dimensional-like (2D-like) anisotropic structural distortion [Δ(a,c)≈ + 1.05 %, Δb/√2≈ -2.2%] and the unusual volume discontinuity (ΔV≈0.13%). These results demonstrate that the pseudo-2D metallic state in LSMO can be realized by a 2D-like anisotropic lattice distortion correlated with the A-type spin ordering and the dx2-y2 orbital ordering.",

author = "Joonghoe Dho and Chi, {E. O.} and Kim, {W. S.} and Hur, {N. H.} and Choi, {Y. N.}",

year = "2002",

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T1 - Structural origin of the pseudo-two-dimensional metallic state in the A-type antiferromagnetic manganites

AU - Dho, Joonghoe

AU - Chi, E. O.

AU - Kim, W. S.

AU - Hur, N. H.

AU - Choi, Y. N.

PY - 2002/4/1

Y1 - 2002/4/1

N2 - The interplay between the structure and A-type spin ordering in La0.46Sr0.54 Mn0.98Cr0.02O3 (LSMO) has been studied using neutron powder diffraction. The antiferromagnetic transition is accompanied by a structural transition from tetragonal I4/mcm with lattice constant a=c≪b/√2 to monoclinic P21/n with b/√2≪a≈c (β≈90.4°). Moreover, the first-order A-type spin ordering is characterized by a two-dimensional-like (2D-like) anisotropic structural distortion [Δ(a,c)≈ + 1.05 %, Δb/√2≈ -2.2%] and the unusual volume discontinuity (ΔV≈0.13%). These results demonstrate that the pseudo-2D metallic state in LSMO can be realized by a 2D-like anisotropic lattice distortion correlated with the A-type spin ordering and the dx2-y2 orbital ordering.

AB - The interplay between the structure and A-type spin ordering in La0.46Sr0.54 Mn0.98Cr0.02O3 (LSMO) has been studied using neutron powder diffraction. The antiferromagnetic transition is accompanied by a structural transition from tetragonal I4/mcm with lattice constant a=c≪b/√2 to monoclinic P21/n with b/√2≪a≈c (β≈90.4°). Moreover, the first-order A-type spin ordering is characterized by a two-dimensional-like (2D-like) anisotropic structural distortion [Δ(a,c)≈ + 1.05 %, Δb/√2≈ -2.2%] and the unusual volume discontinuity (ΔV≈0.13%). These results demonstrate that the pseudo-2D metallic state in LSMO can be realized by a 2D-like anisotropic lattice distortion correlated with the A-type spin ordering and the dx2-y2 orbital ordering.

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JF - Physical Review B - Condensed Matter and Materials Physics

IS - 13

M1 - 132414

ER -

Structural origin of the pseudo-two-dimensional metallic state in the A-type antiferromagnetic manganites

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