Oxygen Isotope Effect in Layered Manganites
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Published:2009-04
Issue:
Volume:152-153
Page:116-119
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ISSN:1662-9779
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Container-title:Solid State Phenomena
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language:
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Short-container-title:SSP
Author:
Taldenkov A.N.1,
Babushkina N.A.1,
Inyushkin A.V.2,
Suryanarayanan R.3
Affiliation:
1. Russian Research Center “Kurchatov Institute”
2. Russian Research Centre
3. Universitй Paris XI
Abstract
The oxygen isotope effect in ceramic bilayer manganite (La1 zPrz)1.2Sr1.8Mn216 18O7 (z = 0, 0.3, 0.4, 0.6) has been investigated. Real and imaginary parts of ac magnetic susceptibility, dc magnetization and magnetoresistance were measured at temperatures from 4.2 to 320 K in applied magnetic field up to 40 kOe. Substantial decrease of ferromagnetic (FM) transition temperature TFM under oxygen isotope substitution 16O → 18O was found. This positive isotope effect amounts to more than 20 K. A number of additional transitions of ferromagnetic type were observed at T >170 K, which also depend on oxygen overall mass. The obtained results are compared with those observed in other manganites exhibiting the large isotope effect.
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Atomic and Molecular Physics, and Optics