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Department of Magnetic Reseach Seminar

14:00, 21-02-17
Microsoft Teams

Single crystal growth of CemTnIn3m+2n phases (T = Pd, Pt): recent results, problems and perspectives

dr Grzegorz Chajewski

Oddział Badań Magnetyków INTiBS PAN we Wrocławiu

Seminarium odbędzie się zdalnie w aplikacji Microsoft Teams. W celu wzięcia udziału w wydarzeniu należy dołączyć do zespołu Seminarium OBM.Można do niego dołączyć na stałe przy użyciu kodu dostępu ol7omod (dotyczy to osób posiadających konto w domenie intibs.pl, pozostałe osoby proszę o kontakt z dr. hab. Adamem Pikulem ()).

Streszczenie:

Cerium-based intermetallics belong to the most investigated compounds in solid state physics. It is mainly due to intriguing electronic properties they exhibit. Among a large variety of phenomena observed in those compounds one may enlist complex magnetic ordering, non-Fermi liquid and heavy-fermion behavior, spin and valence fluctuations, superconductivity, etc.

In recent years much attention has been paid to cerium indides with general formula CemTnIn3m+2m (where T = d-electron transition element). Some members of this family, like CeCoIn5 [1] and Ce2PdIn8 [2], are heavy-fermion superconductors, and in some other (Ce3PtIn11 [3, 4] and Ce3PdIn11 [5, 6]) superconductivity may even coexist with antiferromagnetic ordering. Since in the crystal structure of Ce3TIn11 cerium atoms occupy two inequivalent atomic positions (which form two different cerium sublattices), it is possible that magnetic ordering comes from one of the sublattices and heavy-fermion superconductivity is related to the second one. Up to date such a scenario was neither confirmed nor ruled out. This makes Ce3TIn11 phases an interesting subject for further more detailed studies. However it also requires high quality single crystalline specimens.

Since the crystal structures of all the compounds belonging to the CemTnIn3m+2m family are composed of CeIn3 and TIn2 blocks, the simultaneous growth of multiple CemTnIn3m+2m phases
is commonly observed. This makes the obtaining of pure single crystalline phases very challenging task. In our ongoing studies we explore indium-rich part of ternary Ce-T-In phase diagrams
(T = Pt, Pd) in order to find the effective and selective way of growing CemTnIn3m+2m phases. Here I will present recent results of our efforts in obtaining large single crystals devoid of parasitic phases.

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