Spin dynamical properties of the layered perovskite La1.2Sr1.8Mn2O7

被引：33

作者：

Fujioka, H ^{[1
]}

Kubota, M

Hirota, K

Yoshizawa, H

Moritomo, Y

Endoh, Y

机构：

[1] Tohoku Univ, Dept Phys, CREST, Sendai, Miyagi 9808578, Japan

[2] Univ Tokyo, ISSP, Neutron Scattering Lab, Tokai, Ibaraki 3191106, Japan

[3] Nagoya Univ, Ctr Integrated Res Sci & Engn, Nagoya, Aichi 4648601, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1999年 / 60卷 / 8-9期

关键词：

magnetic materials; crystal growth; neutron scattering; spin-density waves;

D O I：

10.1016/S0022-3697(99)00071-2

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Inelastic neutron-scattering measurements were performed on a single crystal of the layered colossal magnetoresistance (CMR) material La1.2Sr1.8Mn2O7 (T-C similar to 120 K). We found that the spin wave dispersion is almost perfectly two-dimensional with the in-plane spin stiffness constant D similar to 151 meV Angstrom. The value is similar to that of similarly doped La1-xSrxMnO3 though its T-c is three times higher, indicating a large renormalization due to low dimensionality. There exist two branches due to a coupling between layers within a double-layer. The out-of-plane coupling is about 30% of the in-plane coupling though the Mn-O bond lengths are similar. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：1165 / 1168

页数：4

共 12 条

[1] Sign reversal of the Mn-O bond compressibility in La1.2Sr1.8Mn2O7 below T-C: Exchange striction in the ferromagnetic state
Argyriou, DN
Mitchell, JF
Goodenough, JB
Chmaissem, O
Short, S
Jorgensen, JD
[J]. PHYSICAL REVIEW LETTERS, 1997, 78 (08) : 1568 - 1571
[2] Evolution of the low-frequency spin dynamics in ferromagnetic manganites
Fernandez-Baca, JA
Dai, P
Hwang, HY
Kloc, C
Cheong, SW
[J]. PHYSICAL REVIEW LETTERS, 1998, 80 (18) : 4012 - 4015
[3] Neutron-diffraction studies on the magnetic ordering process in the layered Mn perovskite La2-2xSr1+2xMn2O7 (x = 0.40, 0.45 and 0.48)
Hirota, K
Moritomo, Y
Fujioka, H
Kubota, M
Yoshizawa, H
Endoh, Y
[J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1998, 67 (10) : 3380 - 3383
[4] Neutron-scattering studies of magnetic excitations in La1-xSrxMnO3: A dimensional crossover
Hirota, K
Kaneko, N
Nishizawa, A
Endoh, Y
Martin, MC
Shirane, G
[J]. PHYSICA B, 1997, 237 : 36 - 38
[5] HOLSTEIN T, 1940, PHYS REV, V58, P1094
[6] Interplane tunneling magnetoresistance in a layered manganite crystal
Kimura, T
Tomioka, Y
Kuwahara, H
Asamitsu, A
Tamura, M
Tokura, Y
[J]. SCIENCE, 1996, 274 (5293) : 1698 - 1701
[7] KUBOTA M, 1999, J PHYS CHEM SOLIDS, V60
[8] Magnetism and structural distortion in the La0.7Sr0.3MnO3 metallic ferromagnet
Martin, MC
Shirane, G
Endoh, Y
Hirota, K
Moritomo, Y
Tokura, Y
[J]. PHYSICAL REVIEW B, 1996, 53 (21) : 14285 - 14290
[9] Charge delocalization and structural response in layered La1.2Sr1.8Mn2O7: Enhanced distortion in the metallic regime
Mitchell, JF
Argyriou, DN
Jorgensen, JD
Hinks, DG
Potter, CD
Bader, SD
[J]. PHYSICAL REVIEW B, 1997, 55 (01) : 63 - 66
[10] Giant magnetoresistance of manganese oxides with a layered perovskite structure
Moritomo, Y
Asamitsu, A
Kuwahara, H
Tokura, Y
[J]. NATURE, 1996, 380 (6570) : 141 - 144

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