Paper Title:
Effect of the A-Site Randomness on Magnetotransport Properties of PrBaMn2O6 Manganites
  Abstract

A-site ordered PrBaMn2O6 manganites were obtained by a two-step synthesis process. The chemical composition, crystal structure, magnetic and magnetotransport properties have been investigated with regard to the degree of ordering of the Pr3+ and Ba2+ cations. A-site disordered Pr0.50Ba0.50MnO3 has a cubic perovskite-like unit cell (SG = Pm3m , Z = 1), while the A-site ordered PrBaMn2O6 has a tetragonal unit cell (SG = P4/mmm, Z = 2). The A-site ordered state in PrBaMn2O6 remains stable on heating to 1300 0C in an oxidizing medium (P[O2] = 1 bar). The cation ordering leads to a significant increase in the critical temperatures of phase transitions. Asite ordered PrBaMn2O6 is a metallic ferromagnet with the TC ~ 320 K, whereas TC of a fully disordered sample is ∼ 140 K. The samples with intermediate degrees of ordering contain two magnetic phases. Slightly below TC, all samples exhibit a metal–insulator transition and a peak of the magnetoresistance, amounting to approximately 10 % and 65 % in a magnetic field of 9 kOe for the fully ordered PrBaMn2O6 and disordered Pr0.50Ba0.50MnO3, respectively. The results are interpreted in terms of the degree of ordering of the Pr3+ and Ba2+ cations.

  Info
Periodical
Solid State Phenomena (Volume 128)
Main Theme
Edited by
Witold Łojkowski and John R. Blizzard, Urszula Narkiewicz and Janusz D. Fidelus
Pages
187-192
DOI
10.4028/www.scientific.net/SSP.128.187
Citation
S.V. Trukhanov, I.O. Troyanchuk, A.V. Trukhanov, H. Szymczak, "Effect of the A-Site Randomness on Magnetotransport Properties of PrBaMn2O6 Manganites", Solid State Phenomena, Vol. 128, pp. 187-192, 2007
Online since
October 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: A.K. Azad, S.-G. Eriksson, Håkan Rundlöf, J. Eriksen
Abstract:The double perovskites Ca2-xSrxMnWO6 (x = 0.0, 0.5, 1.0, 1.5, 2.0) have been prepared as pure phases by a...
375
Authors: J. Feng, Q.B. Bo, P. Che, J.P. Wang, M.F. Lu, J.F. Liu, Xue Qiang Cao, Jian Meng
Abstract:The layered manganese oxides LaSr2Mn2-xTxO7 (T=Fe, Cr and Ni) has been prepared. The effect of substitution of transition metal ions for Mn...
2227
Authors: K.F. Wang, X.P. Liu, Q.C. Li, Y. Wang, L.F. Wang, S. Dong, H. Yu, J.M. Liu
Abstract:The effects of A-site cation size disorder in ABO3 type ferromagnetic metallic La0.55Ca0.45MnO3 system have been studied by substituting...
351
Authors: V.A. Khomchenko, Michael Kopcewicz, Armandina M. Lima Lopes, Yuri G. Pogorelov, J.P. Araujo, Joaquim M. Vieira, Andréi L. Kholkin
Abstract:Investigation of crystal structure and magnetic properties of the diamagnetically- substituted Bi1-xAxFeO3-x/2 (A= Ca, Sr, Pb, Ba; x= 0.2,...
131
Authors: Yeong Seung Jeong, M.S. Anwar, Faheem Ahmed, Seung Rok Lee, Bon Heun Koo
Chapter 2: Materials Science and Applications, Materials Processing Technology
Abstract:We report the magnetic transition and large magnetic entropy change in Sr doped lanthanum manganites. Polycrystalline...
225