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Oxygen Isotope Effect in Layered Manganites
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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.
Trans Tech Publications, Ltd.
Title: Oxygen Isotope Effect in Layered Manganites
Description:
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.
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