Oxygen Isotope Effect in Layered Manganites

Abstract:

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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.

Info:

Periodical:

Solid State Phenomena (Volumes 152-153)

Edited by:

N. Perov

Pages:

116-119

DOI:

10.4028/www.scientific.net/SSP.152-153.116

Citation:

A.N. Taldenkov et al., "Oxygen Isotope Effect in Layered Manganites", Solid State Phenomena, Vols. 152-153, pp. 116-119, 2009

Online since:

April 2009

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Price:

$35.00

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