Magnetoresistance and electron paramagnetic resonance study of La 0.67-yYyBa0.33MnO3/LaAlO 3 thin films

K. W. Lee; J. I. Choi; S. H. Kim; Cheol Eui Lee; Y. H. Jo; S. G. Lee

doi:10.1016/j.ssc.2004.07.003

Magnetoresistance and electron paramagnetic resonance study of La _0.67-yY_yBa_0.33MnO₃/LaAlO ₃ thin films

K. W. Lee, J. I. Choi, S. H. Kim, Cheol Eui Lee, Y. H. Jo, S. G. Lee

Department of Physics

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

2 Citations (Scopus)

Abstract

Magnetoresistive La_0.67-yY_yBa_0.33MnO ₃/LaAlO₃ thin films were prepared by the sol-gel spin-coating method. Our resistivity and the electron spin resonance (ESR) measurements indicate that the main factor determining the metal-insulator transition temperature T_m is the cation disorder represented by the cation radii variance σ², and that ferromagnetic insulating regions coexist in the ferromagnetic metallic phase. In the paramagnetic phase, the dissociation energy of spin clusters and the polaron hopping energy obtained from the ESR intensity and linewidth also displayed a prominent dependence on σ². Polaron localization due to Jahn-Teller distortions appears to be responsible simultaneously for the decrease in the ferromagnetic order and for the increase in the orbital order.

Original language	English
Pages (from-to)	753-758
Number of pages	6
Journal	Solid State Communications
Volume	131
Issue number	12
DOIs	https://doi.org/10.1016/j.ssc.2004.07.003
Publication status	Published - 2004 Sept

Keywords

A. Magnetic films and multilayers
D. Spin dynamics
E. Electron paramagnetic resonance

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/j.ssc.2004.07.003

Cite this

@article{04dfa98ac0b04ed8ba5c508e2cf4ab09,

title = "Magnetoresistance and electron paramagnetic resonance study of La 0.67-yYyBa0.33MnO3/LaAlO 3 thin films",

abstract = "Magnetoresistive La0.67-yYyBa0.33MnO 3/LaAlO3 thin films were prepared by the sol-gel spin-coating method. Our resistivity and the electron spin resonance (ESR) measurements indicate that the main factor determining the metal-insulator transition temperature Tm is the cation disorder represented by the cation radii variance σ2, and that ferromagnetic insulating regions coexist in the ferromagnetic metallic phase. In the paramagnetic phase, the dissociation energy of spin clusters and the polaron hopping energy obtained from the ESR intensity and linewidth also displayed a prominent dependence on σ2. Polaron localization due to Jahn-Teller distortions appears to be responsible simultaneously for the decrease in the ferromagnetic order and for the increase in the orbital order.",

keywords = "A. Magnetic films and multilayers, D. Spin dynamics, E. Electron paramagnetic resonance",

author = "Lee, {K. W.} and Choi, {J. I.} and Kim, {S. H.} and Lee, {Cheol Eui} and Jo, {Y. H.} and Lee, {S. G.}",

note = "Funding Information: This work was supported by the KISTEP (National Research Laboratory and M102KS010001-02K1901-01814) and by the Brain Korea 21 Project in 2004. C.E.L. gratefully acknowledges a grant from the Korea University Research Fund. Measurements at the Korea Basic Science Institute (KBSI) are acknowledged.",

year = "2004",

month = sep,

doi = "10.1016/j.ssc.2004.07.003",

language = "English",

volume = "131",

pages = "753--758",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Limited",

number = "12",

}

TY - JOUR

T1 - Magnetoresistance and electron paramagnetic resonance study of La 0.67-yYyBa0.33MnO3/LaAlO 3 thin films

AU - Lee, K. W.

AU - Choi, J. I.

AU - Kim, S. H.

AU - Lee, Cheol Eui

AU - Jo, Y. H.

AU - Lee, S. G.

N1 - Funding Information: This work was supported by the KISTEP (National Research Laboratory and M102KS010001-02K1901-01814) and by the Brain Korea 21 Project in 2004. C.E.L. gratefully acknowledges a grant from the Korea University Research Fund. Measurements at the Korea Basic Science Institute (KBSI) are acknowledged.

PY - 2004/9

Y1 - 2004/9

N2 - Magnetoresistive La0.67-yYyBa0.33MnO 3/LaAlO3 thin films were prepared by the sol-gel spin-coating method. Our resistivity and the electron spin resonance (ESR) measurements indicate that the main factor determining the metal-insulator transition temperature Tm is the cation disorder represented by the cation radii variance σ2, and that ferromagnetic insulating regions coexist in the ferromagnetic metallic phase. In the paramagnetic phase, the dissociation energy of spin clusters and the polaron hopping energy obtained from the ESR intensity and linewidth also displayed a prominent dependence on σ2. Polaron localization due to Jahn-Teller distortions appears to be responsible simultaneously for the decrease in the ferromagnetic order and for the increase in the orbital order.

AB - Magnetoresistive La0.67-yYyBa0.33MnO 3/LaAlO3 thin films were prepared by the sol-gel spin-coating method. Our resistivity and the electron spin resonance (ESR) measurements indicate that the main factor determining the metal-insulator transition temperature Tm is the cation disorder represented by the cation radii variance σ2, and that ferromagnetic insulating regions coexist in the ferromagnetic metallic phase. In the paramagnetic phase, the dissociation energy of spin clusters and the polaron hopping energy obtained from the ESR intensity and linewidth also displayed a prominent dependence on σ2. Polaron localization due to Jahn-Teller distortions appears to be responsible simultaneously for the decrease in the ferromagnetic order and for the increase in the orbital order.

KW - A. Magnetic films and multilayers

KW - D. Spin dynamics

KW - E. Electron paramagnetic resonance

UR - http://www.scopus.com/inward/record.url?scp=4243196964&partnerID=8YFLogxK

U2 - 10.1016/j.ssc.2004.07.003

DO - 10.1016/j.ssc.2004.07.003

M3 - Article

AN - SCOPUS:4243196964

SN - 0038-1098

VL - 131

SP - 753

EP - 758

JO - Solid State Communications

JF - Solid State Communications

IS - 12

ER -