DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Article >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/9220

Title: Transport, magnetic and thermal properties of Pr doped LaSr2Mn2O7: a Kondo-type behaviour of resistivity
Authors: BHATIA, SN
MOHAPATRA, N
KAUNDALAYA, D
MALIK, SK
Keywords: mixed-valence manganites
phase
magnetoresistance
charge
localization
spin
Issue Date: 2006
Publisher: IOP PUBLISHING LTD
Citation: JOURNAL OF PHYSICS-CONDENSED MATTER, 18(31), 7179-7192
Abstract: The interplay of spin, charge and lattice degrees of freedom in LaSr2Mn2O7 (tetragonal, space group I4/mmm) yields a variety of properties such as a CE-type charge ordering and an A-type spin ordering. We have studied the effect of partial replacement of La by Pr on the magnetic and thermal properties of this system. Compounds of the type La1-xPrxSr2Mn2O7 (0 <= x <= 1) have been prepared and are found to crystallize in the same tetragonal structure. Magnetization, electrical resistivity and specific heat measurements have been carried out on these compounds. Replacing La by Pr in this system affects both the electronic and the magnetic state of the system. It is observed that the charge ordering temperature and the net magnetic moment reduce with the incorporation of Pr in the lattice. In the antiferromagnetic state, the charge carriers in La1-xPrxSr2Mn2O7 behave like a weakly scattered two-dimensional gas whose resistivity (rho) is a logarithmic function of temperature, T (rho proportional to log T), over a certain temperature interval. This behaviour is enhanced with increasing concentration of Pr in the samples and is proposed to originate from quantum interference. The electronic part of the specific heat shows the presence of the two transitions at T-CO and T-N and a contribution from antiferromagnetic magnons at low temperatures.
URI: http://dx.doi.org/10.1088/0953-8984/18/31/013
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9220
http://hdl.handle.net/10054/9220
ISSN: 0953-8984
Appears in Collections:Article

Files in This Item:

There are no files associated with this item.

View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback