- Mgr. Marie Kratochvílová: Dimensionality in strongly correlated electron systems:the case of Ce3TIn11 compounds (T = Pd, Pt)
- 20. 11. 2013, 14:00
- Seminar room KFM, first floor Ke Karlovu 5
- more information
Abstract:
Heavy-fermion (HF) materials show a variety of unusual phenomena like unconventional superconductivity and non-Fermi liquid (nFl) behavior. Both phenomena are intimate linked to the presence of a zero-temperature singularity called Quantum Critical Point (QCP), a magnetic to non-magnetic phase transition solely driven by quantum fluctuations. The type of QCP is reflected in the properties of the nFl state in the quantum critical region of the pressure/magnetic field-temperature diagram. A heavy debate is ongoing about the nature of the QCP, pointing to dimensionality as additional important parameter apart from hybridization [1-3]. The CenTmIn3n+2m (T = transition
metal, n = 1, 2,..; m = 0, 1,..) family offers a unique possibility to study how the HF physics is influenced by reduction of dimensionality when going from 3D to 2D Kondo structures. CenTmIn3n+2m compounds display both attributes with cubic CeIn3 at the 3D and CeCoIn5 as an example of the opposite (2D) end of the series [4,5]. We present first results on single crystals of two new members Ce3PdIn11 and Ce3PtIn11 located in between. At ambient pressure superconductivity emerges in the complex antiferromagnetic state below Tc = 0.42 K (Tc = 0.32 K) in Ce3PdIn11 (Ce3PtIn11). Both phenomena coexist in a wide range of the pressure?temperature phase diagrams.
[1] Q. Si, Physica B 378 ? 380, 23 ? 27 (2006).
[2] E. Lebanon & P. Coleman, Phys. Rev. B 76, 085117 (2007).
[3] J. Custers, K-A. Lorenzer, M. Müller, A. Prokofiev, A. Sidorenko, H. Winkler, A.M.
Strydom, Y. Shimura, T. Sakakibara, R. Yu, Q. Si & S. Paschen, Nature. Mater. 11, 189 ?
194 (2012).
[4] N.D. Mathur, F.M. Grosche, S.R. Julian, I.R. Walker, D.M. Freye, R.K.W. Haselwimmer
& G.G. Lonzarich, Nature 394, 39 ? 43 (1998).
[5] C. Petrovic, P.G. Pagliuso, M.F. Hundley, R. Movshovich, J.L. Sarrao, J.D. Thompson,
Z. Fisk & P. Monthoux, J.Phys. Condens. Matter 13, L337 ? L342 (2001).