Magnetic ordering and spin fluctuations in nearly half-doped manganites

H. Yoshizawa; R. Kajimoto; H. Kawano; J. A. Fernandez-Baca; Y. Tomioka; H. Kuwahara; Y. Tokura

doi:10.1016/S0921-5107(99)00062-8

Magnetic ordering and spin fluctuations in nearly half-doped manganites

H. Yoshizawa
, R. Kajimoto
, H. Kawano
, J. A. Fernandez-Baca
, Y. Tomioka
, H. Kuwahara
, Y. Tokura

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Research output: Contribution to journal › Conference article › peer-review

12 Scopus citations

Abstract

We discuss unusual behavior discovered in spin dynamics in the nearly half-doped manganite systems. Nd_0.45Sr_0.55MnO₃ is a metallic antiferromagnet, and exhibits very anisotropic spin wave dispersion relations. The ferromagnetic (FM) state of Pr_1/2Sr_1/2MnO₃ and Nd_1/2Sr_1/2MnO₃ also exhibit clear anisotropic dispersion relations. Such anisotropy reflects the underlying d(x²-y²)-type orbital ordering. We also demonstrate that the high temperature paramagnetic state without charge ordering in doped manganites is characterized by the FM spin fluctuations with an anomalously small energy scale for a wide range of doping concentrations.

Original language	English
Pages (from-to)	125-132
Number of pages	8
Journal	Materials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume	63
Issue number	1
DOIs	https://doi.org/10.1016/S0921-5107(99)00062-8
State	Published - Aug 16 1999
Event	Proceedings of the 1998 7th NEC Symposium on Fundamental Approaches to New Material Phases: Phase Control in Spin-Charge-Orbital Complex Systems - Nasu, Jpn Duration: Oct 11 1998 → Oct 15 1998

Funding

This work was supported by a Grant-In-Aid for Scientific Research from the Ministry of Education, Science and Culture, Japan, by Special Researcher’s Basic Science Program (RIKEN) and by the New Energy and Industrial Technology Development Organization (NEDO) of Japan. The work at ORNL was supported by US DOE under contract No. DE-AC05-840R21400 with Lockheed Martin Energy Systems, Inc., and was carried out under the US-Japan Cooperative Program on Neutron Scattering.

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10.1016/S0921-5107(99)00062-8

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title = "Magnetic ordering and spin fluctuations in nearly half-doped manganites",

abstract = "We discuss unusual behavior discovered in spin dynamics in the nearly half-doped manganite systems. Nd0.45Sr0.55MnO3 is a metallic antiferromagnet, and exhibits very anisotropic spin wave dispersion relations. The ferromagnetic (FM) state of Pr1/2Sr1/2MnO3 and Nd1/2Sr1/2MnO3 also exhibit clear anisotropic dispersion relations. Such anisotropy reflects the underlying d(x2-y2)-type orbital ordering. We also demonstrate that the high temperature paramagnetic state without charge ordering in doped manganites is characterized by the FM spin fluctuations with an anomalously small energy scale for a wide range of doping concentrations.",

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T1 - Magnetic ordering and spin fluctuations in nearly half-doped manganites

AU - Yoshizawa, H.

AU - Kajimoto, R.

AU - Kawano, H.

AU - Fernandez-Baca, J. A.

AU - Tomioka, Y.

AU - Kuwahara, H.

AU - Tokura, Y.

PY - 1999/8/16

Y1 - 1999/8/16

N2 - We discuss unusual behavior discovered in spin dynamics in the nearly half-doped manganite systems. Nd0.45Sr0.55MnO3 is a metallic antiferromagnet, and exhibits very anisotropic spin wave dispersion relations. The ferromagnetic (FM) state of Pr1/2Sr1/2MnO3 and Nd1/2Sr1/2MnO3 also exhibit clear anisotropic dispersion relations. Such anisotropy reflects the underlying d(x2-y2)-type orbital ordering. We also demonstrate that the high temperature paramagnetic state without charge ordering in doped manganites is characterized by the FM spin fluctuations with an anomalously small energy scale for a wide range of doping concentrations.

AB - We discuss unusual behavior discovered in spin dynamics in the nearly half-doped manganite systems. Nd0.45Sr0.55MnO3 is a metallic antiferromagnet, and exhibits very anisotropic spin wave dispersion relations. The ferromagnetic (FM) state of Pr1/2Sr1/2MnO3 and Nd1/2Sr1/2MnO3 also exhibit clear anisotropic dispersion relations. Such anisotropy reflects the underlying d(x2-y2)-type orbital ordering. We also demonstrate that the high temperature paramagnetic state without charge ordering in doped manganites is characterized by the FM spin fluctuations with an anomalously small energy scale for a wide range of doping concentrations.

UR - https://www.scopus.com/pages/publications/0032679881

U2 - 10.1016/S0921-5107(99)00062-8

DO - 10.1016/S0921-5107(99)00062-8

M3 - Conference article

AN - SCOPUS:0032679881

SN - 0921-5107

VL - 63

SP - 125

EP - 132

JO - Materials Science and Engineering B: Solid-State Materials for Advanced Technology

JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology

IS - 1

T2 - Proceedings of the 1998 7th NEC Symposium on Fundamental Approaches to New Material Phases: Phase Control in Spin-Charge-Orbital Complex Systems

Y2 - 11 October 1998 through 15 October 1998

ER -

Magnetic ordering and spin fluctuations in nearly half-doped manganites

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