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Dissertation/Thesis Abstract

Ferromagnetism in the Hexagonal Cage-like Compounds Sm6(Mo, W)4Al43
by Mejia Marin, Juan Jose, M.S., The Florida State University, 2020, 32; 27997135
Abstract (Summary)

We report the synthesis and characterization for two single crystalline lanthenide-host compound Sm6T4Al43 (T = Mo and W), that form in the hexagonal Ho6Mo4Al43 prototype. The Sm ions reside within T/Al cages in which the Sm-Sm nearest neighbors form dimers between adjacent T/Al cages. In which T/Al networks provide a similar environments to those of other cage-like materials (filled skutterudites). Magnetic susceptibility measurements show that both compounds exhibit low anisotropy at high temp with a Curie-Weiss temperature that is positive indicating ferromagnetic ordering. The Modified Curie-Weiss behavior for the fits of the data yield a reduced effective magnetic moment below the expected tetravalent Sm ion (Sm3+), which is typical behavior for Sm compounds exhibiting van Vleck paramagnetism. At low temperatures, both compounds demonstrate magnetic anisotropy, with the crystallographic c axis being the easy axis. Specific heat measurements for the Sm6T4Al43 reveal an enhanced electronic Sommerfeld coefficient that is consistent with a moderately enhanced charge carrier effective mass. The electrical resistivity decreases with decreasing temperature, suggesting that it dominated by f-electronic hybridization effects and with a slight indication for Kondo-like behavior.

Indexing (document details)
Advisor: Baumbach, Ryan
Commitee: Beekman, Christianne, Capstick, Simon, Albrecht-Schmitt, Thomas E.
School: The Florida State University
Department: Physics
School Location: United States -- Florida
Source: MAI 82/3(E), Masters Abstracts International
Subjects: Condensed matter physics, Physics
Keywords: Samarium
Publication Number: 27997135
ISBN: 9798664796957
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