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From Heavy Fermion and Spin-Glass Behavior to Magnetic Order in CeT4M Compounds
T. Tolińskia, A. Kowalczyk a, M. Falkowski a, K. Synoradzki a, G. Chełkowska b, A. Hoser c and S. Rols d
aInstitute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland
bInstitute of Physics, Silesian University, Katowice, Uniwersytecka 4, 40-007 Katowice, Poland
cHelmholtz-Zentrum, Glienicker Straße 100, D-14109 Berlin, Germany
dInstitut Laue Langevin, 6 rue Jules Horowitz, B.P. 156 F-38042, Grenoble Cedex 9, France
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We report on the transitions between the ferromagnetic order, spin-glass behavior, heavy fermion and fluctuating valence state in a series of isostructural compounds CeT4M (T = Ni, Cu; M = Al, Ga, Mn). The dilution of Ce or the T and M elements allowed us to follow the physical properties evolution employing the measurements of the heat capacity, dc magnetic susceptibility, frequency dependent ac magnetic susceptibility, magnetization relaxation, inelastic neutron scattering and also the X-ray photoemission spectroscopy. It is shown that the Mn rich compounds lean towards the spin glass behavior. For the compounds governed by the close to localization Ce 4f states the effect of the crystal electric field has been studied. It has been shown that the spin glass-like behavior can significantly influence the physics of the CeT4M compounds.
DOI: 10.12693/APhysPolA.121.1014
PACS numbers: 71.20.Lp, 71.27.+a, 75.30.Mb, 75.30.Cr, 75.50.Lk, 78.70.Nx