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master's thesis
Magnetska dinamika dvoslojnog manganita La1.4Sr1.6Mn2O7
Zagreb: University of Zagreb, Faculty of Science, 2014. urn:nbn:hr:217:119696
Sunko, Veronika
University of Zagreb
Faculty of Science
Department of Physics

Institutional repository: Repository of the Faculty of Science

Cite this document

Sunko, V. (2014). Magnetska dinamika dvoslojnog manganita La1.4Sr1.6Mn2O7 (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:119696

Sunko, Veronika. "Magnetska dinamika dvoslojnog manganita La1.4Sr1.6Mn2O7." Master's thesis, University of Zagreb, Faculty of Science, 2014. https://urn.nsk.hr/urn:nbn:hr:217:119696

Sunko, Veronika. "Magnetska dinamika dvoslojnog manganita La1.4Sr1.6Mn2O7." Master's thesis, University of Zagreb, Faculty of Science, 2014. https://urn.nsk.hr/urn:nbn:hr:217:119696

Sunko, V. (2014). 'Magnetska dinamika dvoslojnog manganita La1.4Sr1.6Mn2O7', Master's thesis, University of Zagreb, Faculty of Science, accessed 19 December 2024, https://urn.nsk.hr/urn:nbn:hr:217:119696

Sunko V. Magnetska dinamika dvoslojnog manganita La1.4Sr1.6Mn2O7 [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2014 [cited 2024 December 19] Available at: https://urn.nsk.hr/urn:nbn:hr:217:119696

V. Sunko, "Magnetska dinamika dvoslojnog manganita La1.4Sr1.6Mn2O7", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2014. Available at: https://urn.nsk.hr/urn:nbn:hr:217:119696

Metadata
TitleMagnetska dinamika dvoslojnog manganita La1.4Sr1.6Mn2O7
Title (english)Magnetic dynamics of bilayer manganite La1.4Sr1.6Mn2O7
AuthorVeronika Sunko
MentorIvica Živković (mentor)
MentorDamir Pajić (mentor)
Committee memberDamir Pajić (predsjednik povjerenstva)
Committee memberIvica Živković (član povjerenstva)
Committee memberIvan Kupčić (član povjerenstva)
Committee memberMiroslav Požek (član povjerenstva)
Committee memberHrvoje Buljan (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Physics)
Zagreb
Defense date and country2014-09-24, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Physics
Abstract
U ovom radu je istraživana magnetska dinamika dvoslojnog manganita La1.4Sr1.6Mn2O7 mjerenjem linearne i nelinearne izmjenične susceptibilnosti na temperaturama izmedu 4.2 K i 400 K, te magnetizacije izmedu 320 K i 500 K. Dokazano je postojanje Griffithsove faze na 370 K, dugodosežnog magnetskog uređenja na 91.2 K, te pojava staklastog ponašanja na temperaturama nižima od uređenja, s temperaturom ostakljivanja od 26.4 K. Također, uočeno je pet feromagnetskih prijelaza između 250 K i 320 K, koje pripisujemo kristalnim defektima. Predložen je model prema kojem su defekti zaslužni za metalnu vodljivost duž c kristalnog smjera na temperaturama ispod magnetskog uređenja.
Abstract (english)
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.
Keywords
Languagecroatian
URN:NBNurn:nbn:hr:217:119696
Study programmeTitle: Physics; specializations in: Research
Course: Research
Study programme type: university
Study level: integrated undergraduate and graduate
Academic / professional title: magistar/magistra fizike (magistar/magistra fizike)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2017-06-16 11:55:36