Petr Opletal: Preparation and characterization of UCoGa in the context of quantum phase transitions
Begin: 03.05.2017, 14:30
Location: lecture room F2, first floor Ke Karlovu 5

Title: Michał Falkowski: Influence of the crystalline field effect on the ground state properties in Kondo lattice compound Ce6Pd12In5
Number: 10/17
Status: Closing date exceeded
Begin: Středa, Únor 22, 2017 at 02:30
Tutor: Vladimír Sechovský
Location: lecture room F2, first floor Ke Karlovu 5

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We have a pleasure to invite you to attend the joint seminar
of the Department of Condensed Matter Physics (DCMP)
and the Materials Growth and Measurement Laboratory (MGML)




Influence of the crystalline field effect on the ground state
properties in Kondo lattice compound Ce6Pd12In5

lecture given by:

Michał Falkowski


Charles University, Faculty of Mathematics and Physics, DCMP, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

The seminar takes place in the lecture room F2 
of the Faculty of Mathematics and Physics, Ke Karlovu 5, Praha 2
on Wednesday, 22. 2. 2017 from 14:30 

Vladimír Sechovský
On behalf of the DCMP and MGML


The talk will give a general introduction to the physical properties of the new heavy fermion Kondo lattice compound Ce6Pd12In5, sketch the Cornut-Coqblin theory and highlight some important experimental findings. However, in particular we will focus on the crucial aspect of the crystal-electric field effect, which plays an influential role in the ground state of this compound. In the scope of a theoretical approach based on the perturbation type calculation we described our experimental data by using the model incorporating simultaneously the Kondo effect in the presence of crystal-electric field. To our knowledge there are very few examples available in the literature offering theoretical attempts to construct a qualitative description of thermal and electron transport properties (electrical resistivity, thermoelectric power and thermal conductivity) where the ground state multiplet (J=5/2) is strongly governed by the Kondo interaction in the presence of the crystal-electric field gradient, and hence the motivation for this study. Moreover, we will try to discuss the possibility of various scenarios of degeneracy of the ground state multiplet J=5/2 due to the applied magnetic field, external pressure and also by using chemical pressure (effects of alloying).
The results of present studies of Ce6Pd12In5 are mainly focused on the issue concerned of strongly correlated electron systems, in the class of compounds where the electron and thermal transport is produced by strongly correlated electrons that suffer from the Kondo interaction together with energy involvement of crystal-electric field splitting. In our opinion the most significant aspect of presented results is related with the presence of the interplay of magnetic exchange, Kondo and crystal field interactions. A novelty of presented results of Ce6Pd12In5 is that this compound adds a new member to a small but growing class of the ternary Ce systems with such diverse properties of the ground state multiplet of Ce3+(J=5/2).

[1] S.N. Nesterenko, A.I. Tursina, H. Noël, Y.D. Seropegin, JALCOM 426 (2006) 190.
[2] M. Falkowski, A.M. Strydom, JALCOM 613 (2014) 204.
[3] M. Falkowski, D. Krychowski, A.M. Strydom, JAP 120 (2016) 195106.
[4] B. Cornut, B. Coqblin, PRB 5 (1972) 4541.
[5] A.K. Bhattacharjee, B. Coqblin, PRB (1988) 338.

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