Synthesis and characterization of single crystals of rare-earth containing magnetic topological semimetal candidates
Date
2023-08
Authors
Kuthanazhi, Brinda
Major Professor
Advisor
Canfield, Paul C
Bud'ko, Sergey L
Kaminski, Adam
Orth, Peter P
Lajoie, John G
Kovnir, Kirill
Committee Member
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Abstract
In this thesis, I report the synthesis and study of various rare-earth containing magnetic
topological semimetal candidates, namely CeBi, EuCd2As2, and EuIn2. CeBi forms a part of the
larger family of rare-earth monopnictides, hosting myriad topological properties across the family.
We report a systematic study of the magnetic and transport properties with varying temperatures
and applied magnetic fields in CeBi, and study the evolution of magnetoresistance behavior in
different temperature and field regimes. In EuCd2As2, we study the evolution of magnetism with
chemical substitution. We report the synthesis and characterization of Eu(Cd1−xAgx)2As2 and
Eu1−yNayCd2As2 and construct temperature-substitution phase diagrams. We further show that
a magnetic state with a net ferromagnetic moment is stabilized by both Ag and Na doping.
EuIn2, yet another Eu-containing magnetic topological semimetal candidate, was synthesized and
three successive magnetic transitions were observed at low temperatures. Furthermore, M ̈ossbauer
spectroscopy measurements suggest an incommensurate moment modulated phase setting in at
the highest temperature magnetic transition, eventually evolving into a non-modulated yet
incommensurate phase below the lowest transition. Finally, we briefly look at the search for single
ion Kondo effect in the rare-earth monopnictide series, with Ce doping in ScSb and LaSb.
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Physics and Astronomy
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article