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Magnetic properties of R2PdSi3 (R = heavy rare earth) compounds

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Magnetic properties of R2PdSi3 (R = heavy rare earth) compounds (English shop)

Matthias Dietrich Frontzek (Author)


Table of Contents, Datei (61 KB)
Extract, Datei (470 KB)

ISBN-13 (Printausgabe) 386955102X
ISBN-13 (Hard Copy) 9783869551029
ISBN-13 (eBook) 9783736931022
Language English
Page Number 158
Edition 1 Aufl.
Volume 0
Publication Place Göttingen
Publication Date 2009-09-14
General Categorization Dissertation
Departments Physics

The R2PdSi3 (R = heavy rare earth) have been synthesized first in 1990 in the search for materials with unusual electronic properties. The availability of single crystals was the starting point for several investigations of the magneto-crystalline anisotropy, also in applied magnetic fields. The results of the observed properties in resistivity, magnetization and susceptibility lead to the summary that these compounds range from interesting to exotic and that their magnetic properties are low dimensional, spin-glass like and altogether “novel”.
The focus of this thesis is the careful analysis of the magnetic properties and magnetic structures of single crystalline R2PdSi3 (R = Gd, Tb, Dy, Ho, Er, Tm). The investigation of macroscopic properties uses magnetization and ac-susceptibility measurements. Resulting from these investigations are magnetic phase diagrams. Neutron and resonant X-ray diffraction measurements elucidate the magnetic structure for the investigated compounds. The phase diagram of Tb2PdSi3 is the starting point of a detailed neutron diffraction study in applied magnetic fields up to 6.5 T and in the temperature range from 0.05 K to 100 K on this compound. Key to the understanding of the R2PdSi3 is the strong coupling of crystallographic structure to the magnetic properties. Thus the established framework of exchange interaction and magneto-crystalline anisotropy allows a collective description instead of a “novel” behavior.