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Semiconducting and magnetic properties of La0.67Ca0.33Mn 1-xDyx O3 ceramics

Electrical resistivity measurements of La0.67Ca0.33Mn1-xDyxO3, x = 0.00 to 0.12, ceramics have been studied using a standard four point probe technique, while the magnetic behaviour have been studied using Ac susceptibility technique. The transport properties show the transition of semiconducting to...

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Main Authors: Shaari, Abdul Halim, Koh, S. F., Chow, Sai Pew, Saion, Elias, Hashim, Mansor, Wan Yusoff, Wan Mohamad Daud
Format: Conference or Workshop Item
Language:English
Published: IEEE 1998
Online Access:http://psasir.upm.edu.my/id/eprint/51252/1/51252.pdf
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spelling oai:psasir.upm.edu.my:51252 http://psasir.upm.edu.my/id/eprint/51252/ Semiconducting and magnetic properties of La0.67Ca0.33Mn 1-xDyx O3 ceramics Shaari, Abdul Halim Koh, S. F. Chow, Sai Pew Saion, Elias Hashim, Mansor Wan Yusoff, Wan Mohamad Daud Electrical resistivity measurements of La0.67Ca0.33Mn1-xDyxO3, x = 0.00 to 0.12, ceramics have been studied using a standard four point probe technique, while the magnetic behaviour have been studied using Ac susceptibility technique. The transport properties show the transition of semiconducting to metallic conductivity at TP and Paramagnetic-Ferromagnetic transitions, TC, were observed in the χ-temperature curves for all samples. The existence of metallic conductivity, TP, and ferromagnetism, TC, were found to be linearly correlated. This phenomenon of coexistence are due to the double exchange interaction of two electrons in Mn3+-O2--Mn4+ and Mn4+-O2--Mn3+ configuration which brings the system below Tc into a metallic state. Hence it is observed that the Curie temperature Tc is closely related to the sharp decrease in the electrical resistivity of the samples. However, both transition temperatures shift to lower temperature as dysprosium doping increases indicating the loss of ferromagnetic order and transport properties. As for the transport properties the semiconductor model ln(σ) to approximately (Eg/2kT) was used to explain the conduction mechanism of perovskite manganites above Tp. It was concluded that the total conductivity, σtot, consists of the intrinsic and the extrinsic components, such that σtot = σint+σext. The energy gap decreases initially from 0.11 eV to a minimum value of 0.06 eV at x = 0.03 and increases again to 0.08 eV at the composition of x = 0.12 for extrinsic region. IEEE 1998 Conference or Workshop Item PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/51252/1/51252.pdf Shaari, Abdul Halim and Koh, S. F. and Chow, Sai Pew and Saion, Elias and Hashim, Mansor and Wan Yusoff, Wan Mohamad Daud (1998) Semiconducting and magnetic properties of La0.67Ca0.33Mn 1-xDyx O3 ceramics. In: 1998 IEEE International Conference on Semiconductor Electronics (lCSE'98), 24-26 Nov. 1998, Equatorial Hotel, Bangi. (pp. 194-198). 10.1109/SMELEC.1998.781178
institution UPM IR
collection UPM IR
language English
description Electrical resistivity measurements of La0.67Ca0.33Mn1-xDyxO3, x = 0.00 to 0.12, ceramics have been studied using a standard four point probe technique, while the magnetic behaviour have been studied using Ac susceptibility technique. The transport properties show the transition of semiconducting to metallic conductivity at TP and Paramagnetic-Ferromagnetic transitions, TC, were observed in the χ-temperature curves for all samples. The existence of metallic conductivity, TP, and ferromagnetism, TC, were found to be linearly correlated. This phenomenon of coexistence are due to the double exchange interaction of two electrons in Mn3+-O2--Mn4+ and Mn4+-O2--Mn3+ configuration which brings the system below Tc into a metallic state. Hence it is observed that the Curie temperature Tc is closely related to the sharp decrease in the electrical resistivity of the samples. However, both transition temperatures shift to lower temperature as dysprosium doping increases indicating the loss of ferromagnetic order and transport properties. As for the transport properties the semiconductor model ln(σ) to approximately (Eg/2kT) was used to explain the conduction mechanism of perovskite manganites above Tp. It was concluded that the total conductivity, σtot, consists of the intrinsic and the extrinsic components, such that σtot = σint+σext. The energy gap decreases initially from 0.11 eV to a minimum value of 0.06 eV at x = 0.03 and increases again to 0.08 eV at the composition of x = 0.12 for extrinsic region.
format Conference or Workshop Item
author Shaari, Abdul Halim
Koh, S. F.
Chow, Sai Pew
Saion, Elias
Hashim, Mansor
Wan Yusoff, Wan Mohamad Daud
spellingShingle Shaari, Abdul Halim
Koh, S. F.
Chow, Sai Pew
Saion, Elias
Hashim, Mansor
Wan Yusoff, Wan Mohamad Daud
Semiconducting and magnetic properties of La0.67Ca0.33Mn 1-xDyx O3 ceramics
author_facet Shaari, Abdul Halim
Koh, S. F.
Chow, Sai Pew
Saion, Elias
Hashim, Mansor
Wan Yusoff, Wan Mohamad Daud
author_sort Shaari, Abdul Halim
title Semiconducting and magnetic properties of La0.67Ca0.33Mn 1-xDyx O3 ceramics
title_short Semiconducting and magnetic properties of La0.67Ca0.33Mn 1-xDyx O3 ceramics
title_full Semiconducting and magnetic properties of La0.67Ca0.33Mn 1-xDyx O3 ceramics
title_fullStr Semiconducting and magnetic properties of La0.67Ca0.33Mn 1-xDyx O3 ceramics
title_full_unstemmed Semiconducting and magnetic properties of La0.67Ca0.33Mn 1-xDyx O3 ceramics
title_sort semiconducting and magnetic properties of la0.67ca0.33mn 1-xdyx o3 ceramics
publisher IEEE
publishDate 1998
url http://psasir.upm.edu.my/id/eprint/51252/1/51252.pdf
_version_ 1819297136974495744
score 13.4562235

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