Magnetic properties of RE0.7Ca0.3Mn0.95Fe0.05O 3 (RE=Sm and Gd) manganites at low temperature

E. K. Abdel-Khalek; A. F. Salem; E. A. Mohamed; A. A. Bahgat

doi:10.1016/j.jmmm.2009.11.023

Magnetic properties of RE_0.7Ca_0.3Mn_0.95Fe_0.05O₃ (RE=Sm and Gd) manganites at low temperature

E. K. Abdel-Khalek^*
, A. F. Salem
, E. A. Mohamed
, A. A. Bahgat

^*Corresponding author for this work

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

17 Scopus citations

Abstract

The magnetic properties of RE_0.7Ca_0.3Mn_0.95Fe_0.05O₃ perovskite with rare-earth cations (RE=Sm and Gd) were investigated by means of X-ray diffraction, Mössbauer spectroscopy, and low temperature (4.2-266 K) magnetization measurements. Structural characterization of these compounds shows that they both have orthorhombic (Pbnm) structure. The Mössbauer spectra show clear evidence of local structural distortion of the Mn(Fe)O₆ octahedron, which is based on the non-zero nuclear quadrupole interactions for high-spin Fe³⁺ ions. It was found that the local structural distortion increases significantly when Sm³⁺ is replaced by Gd³⁺. This distortion is attributed to the Jahn-Teller coupling strength as estimated from the Mössbauer effect results. The magnetic results indicate that the Curie temperature decreases as a result of replacing Sm by Gd. This is due to the decrease of the average A-site cationic radius 〈r_A〉. The rapid increase of magnetization at low temperature indicates the magnetic ordering of rare earth ions at the A-site.

Original language	English
Pages (from-to)	909-914
Number of pages	6
Journal	Journal of Magnetism and Magnetic Materials
Volume	322
Issue number	8
DOIs	https://doi.org/10.1016/j.jmmm.2009.11.023
State	Published - Apr 2010

Keywords

Low temperature
Manganite
Mössbauer effect
Perovskite
VSM

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2009.11.023

Cite this

@article{4e26f49488224fbcb7942580801c5966,

title = "Magnetic properties of RE0.7Ca0.3Mn0.95Fe0.05O 3 (RE=Sm and Gd) manganites at low temperature",

abstract = "The magnetic properties of RE0.7Ca0.3Mn0.95Fe0.05O 3 perovskite with rare-earth cations (RE=Sm and Gd) were investigated by means of X-ray diffraction, M{\"o}ssbauer spectroscopy, and low temperature (4.2-266 K) magnetization measurements. Structural characterization of these compounds shows that they both have orthorhombic (Pbnm) structure. The M{\"o}ssbauer spectra show clear evidence of local structural distortion of the Mn(Fe)O6 octahedron, which is based on the non-zero nuclear quadrupole interactions for high-spin Fe3+ ions. It was found that the local structural distortion increases significantly when Sm3+ is replaced by Gd3+. This distortion is attributed to the Jahn-Teller coupling strength as estimated from the M{\"o}ssbauer effect results. The magnetic results indicate that the Curie temperature decreases as a result of replacing Sm by Gd. This is due to the decrease of the average A-site cationic radius 〈rA〉. The rapid increase of magnetization at low temperature indicates the magnetic ordering of rare earth ions at the A-site.",

keywords = "Low temperature, Manganite, M{\"o}ssbauer effect, Perovskite, VSM",

author = "Abdel-Khalek, \{E. K.\} and Salem, \{A. F.\} and Mohamed, \{E. A.\} and Bahgat, \{A. A.\}",

year = "2010",

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doi = "10.1016/j.jmmm.2009.11.023",

language = "English",

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T1 - Magnetic properties of RE0.7Ca0.3Mn0.95Fe0.05O 3 (RE=Sm and Gd) manganites at low temperature

AU - Abdel-Khalek, E. K.

AU - Salem, A. F.

AU - Mohamed, E. A.

AU - Bahgat, A. A.

PY - 2010/4

Y1 - 2010/4

N2 - The magnetic properties of RE0.7Ca0.3Mn0.95Fe0.05O 3 perovskite with rare-earth cations (RE=Sm and Gd) were investigated by means of X-ray diffraction, Mössbauer spectroscopy, and low temperature (4.2-266 K) magnetization measurements. Structural characterization of these compounds shows that they both have orthorhombic (Pbnm) structure. The Mössbauer spectra show clear evidence of local structural distortion of the Mn(Fe)O6 octahedron, which is based on the non-zero nuclear quadrupole interactions for high-spin Fe3+ ions. It was found that the local structural distortion increases significantly when Sm3+ is replaced by Gd3+. This distortion is attributed to the Jahn-Teller coupling strength as estimated from the Mössbauer effect results. The magnetic results indicate that the Curie temperature decreases as a result of replacing Sm by Gd. This is due to the decrease of the average A-site cationic radius 〈rA〉. The rapid increase of magnetization at low temperature indicates the magnetic ordering of rare earth ions at the A-site.

AB - The magnetic properties of RE0.7Ca0.3Mn0.95Fe0.05O 3 perovskite with rare-earth cations (RE=Sm and Gd) were investigated by means of X-ray diffraction, Mössbauer spectroscopy, and low temperature (4.2-266 K) magnetization measurements. Structural characterization of these compounds shows that they both have orthorhombic (Pbnm) structure. The Mössbauer spectra show clear evidence of local structural distortion of the Mn(Fe)O6 octahedron, which is based on the non-zero nuclear quadrupole interactions for high-spin Fe3+ ions. It was found that the local structural distortion increases significantly when Sm3+ is replaced by Gd3+. This distortion is attributed to the Jahn-Teller coupling strength as estimated from the Mössbauer effect results. The magnetic results indicate that the Curie temperature decreases as a result of replacing Sm by Gd. This is due to the decrease of the average A-site cationic radius 〈rA〉. The rapid increase of magnetization at low temperature indicates the magnetic ordering of rare earth ions at the A-site.

KW - Low temperature

KW - Manganite

KW - Mössbauer effect

KW - Perovskite

KW - VSM

UR - https://www.scopus.com/pages/publications/75449083830

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DO - 10.1016/j.jmmm.2009.11.023

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JO - Journal of Magnetism and Magnetic Materials

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