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Study of the physical properties of La2 − xErxTi2O7 (0 ≤ x ≤ 0.075) compounds

Published online by Cambridge University Press:  03 August 2012

N. Ben Amor ,
M. Bejar ,
E. Dhahri ,
M. Bekri ,
M.A. Valente  and
E.K. Hlil
N. Ben Amor
Affiliation:
Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, BP 1171, Université de Sfax, 3000 Sfax, Tunisia
M. Bejar
Affiliation:
Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, BP 1171, Université de Sfax, 3000 Sfax, Tunisia
E. Dhahri*
Affiliation:
Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, BP 1171, Université de Sfax, 3000 Sfax, Tunisia
M. Bekri
Affiliation:
Physics Department, Rabigh College of Science and Art, King Abdulaziz University, P.O. Box 344, 21911 Rabigh, Saudi Arabia
M.A. Valente
Affiliation:
I3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal
E.K. Hlil
Affiliation:
Institut Néel, CNRS – Université J. Fourier, BP 166, 38042 Grenoble, France
*
ae-mail: essebti@yahoo.com
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Abstract

New complex magnetic frustrated materials La2 − xErxTi2O7 (0 ≤ x ≤ 0.075) have been synthesized by solid-solid method. The crystallographic and magnetic properties were studied as a function of substitution of the La3+ ion by the Er3+ one. All samples are found to be single phase and crystallize in the monoclinic structure with P21 space group. Magnetic measurements have revealed the presence of dominant antiferromagnetic interactions and the absence of magnetic ordering until a temperature of 2 K. The magnetic study suggests that the Curie-Weiss temperature (θCW) is negative, as expected in the frustrated lanthanide sublattice in the Ln2 – xLn’xM2O7 structure. From the frustration index f = - θCW/TN, we have deduced the presence of a strong frustration phenomenon. The critical properties of the antiferromagnetic behavior, for x = 0.025, 0.05 and 0.075 samples, have been investigated. It was found that the 2D-self-avoiding walk (SAW) model is the best one to describe the critical phenomena.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 59 , Issue 1 , July 2012 , 10601
Copyright
© EDP Sciences, 2012

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