Magnetic dynamics of the bilayer manganite La_1.4Sr_1.6Mn_2O7

Sunko, Veronika (2014) Magnetic dynamics of the bilayer manganite La_1.4Sr_1.6Mn_2O7. Diploma thesis, Faculty of Science > Department of Physics.

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Abstract

The magnetic dynamics of the bilayer manganite La1.4Sr1.6Mn2O7 was investigated by measuring the linear and nonlinear AC susceptibility between 4.2 K and 400 K, and magnetization between 320 K and 500 K. It was proven that a Griffiths-like phase appears at 370 K, and that long range order is set at 91.2 K. Bellow the ordering temperature the system behaves as a reentrant spin glass, with the freezing temperature of 26.4 K. Also, there are five ferromagnetic transitions between 250 K and 320 K, which are attributed to crystal defects. We propose a model according to which these defects cause the metallic conduction in the c crystallographic direction in the magnetically ordered phase.

Item Type: Thesis (Diploma thesis)
Supervisor: Živković, Ivica
Co-supervisor: Pajić, Damir
Date: 24 September 2014
Number of Pages: 55
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 27 Nov 2014 10:59
Last Modified: 05 Sep 2016 15:47
URI: http://digre.pmf.unizg.hr/id/eprint/3394

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