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Seminarium Oddziału Badań Magnetyków

13:30 środa, 08-05-19
sala nr 6 (bud. II)

Structural Diversity and Interesting Physical Properties of the Compounds in the RE2TX3 Family

Sebastian Peter

Centrum Zaawansowanych Badań Naukowych im. Jawaharlala Nehru w Bengaluru w Indiach

We have synthesized several compounds within the general formula RE2TX3 (RE = Ce, Eu, Yb; T = Transition metals, X = Si, Ge). The examples are Ce2AuGe3,1 Ce2PtGe3,2 Ce2RhGe3,3 Eu2AuSi3,4 Eu2AgGe3,5 Eu2AuGe3,6 Yb2AuSi3,4 Yb2AuGe3,7,8 Ce2PdGe3,9 RE2NiGe3 (RE = La, Ce)10 Nd2NiGe311 and RE2AgGe3 (RE = Ce, Pr, Nd).12 Interestingly, these compounds crystallize in different ordered superstructures of the AlB2 type due to different puckering nature of the hexagon layer made up of transition metals and p-block elements. Ce2AuGe3 crystallizes in the hexagonal P6/mmm space group, Ce2PtGe3 crystallizes in the orthorhombic Cmcm space group, Ce2RhGe3 crystallizes in both tetragonal I41/amd and hexagonal P6/mmm space group, Eu2AuSi3, Yb2AuGe3, Ca2AuGe3 and Sr2AuGe3 crystallize in the orthorhombic Fmmm space group, Eu2AuGe3 crystallizes in Fmmm at RT and P21/c space group at 7 K, and Eu2AgGe3 and Yb2AuSi3 crystallize in the orthorhombic Fddd space group.  The structural comparison has been explained through various symmetry reduction methods like klassengleiche (k) and translationengleiche (t) from the AlB2 structure. Every new compound discovered displayed a novel situation in the physical properties as well.  Eu2AuGe3 and Yb2AuGe3 show structural phase transitions at high temperature, Eu2AuGe3 is a metamagnet and show phase transition at low temperature, multiple magnetic transitions observed in pseudo gap compound Eu2AgGe3, spin glass behavior observed in Ce2PtGe3 and Ce2RhGe3, ferromagnetic ordering observed in Ce2AuGe3 and Fermi liquid behavior in Yb2AuGe3. I am currently interested in understanding the complex physics merged with chemistry to explain novel properties underlined in these materials. My group is also looking forward to study the electronic structure to understand the driving force for the structural diversity in these compounds due to unstable f orbital. The electronic structures can give an insight to the role of electronic and/or phonic contributions in the structural diversity.  

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