12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

Thermal and electronic transport studies of the Kondo energy scale in the heavy-fermion system CeCu5-xAlx

13 Jul 2011, 17:00


Poster Presentation Track A - Condensed Matter Physics and Material Science Poster1


Prof. Andre Strydom (University of Johannesburg)


The binary compound CeCu5 is an archetypal heavy-fermion Kondo lattice with an antiferromagnetic ground state. Strong hybridization effects between the localized 4f-electron moment and conduction electrons result in incoherent spin scattering in the electronic transport at high temperatures, but with an effective magnetic moment nearly equal to that of the free-ion Ce3+ state. Long-range magnetic ordering at TN = 3.9 K and the Kondo temperature TK=2.2 K are of similar energy scales, making this system ideally suited to studies of competing magnetic interactions in the strongly correlated electron class of systems. In this work we synthesized a series of pseudo-binary compounds CeCu5-xAlx. The dilution of Cu by Al results in augmenting the electronic density of states close to the Fermi energy, which is also the location of the magnetic and hybridized 4f electron levels resonance. Our studies of the temperature and magnetic field dependencies of thermoelectric power and electrical resistivity in the CeCu5-xAlx series of compounds will be discussed in terms of comparitive calculations of the Kondo energy scale from data of magnetoresistivity (the single-ion Bethe Ansatz theory) and from the thermoelectric power (phenomenological description in presence of intermediate valency) by means of two different theoretical models.

Level (Hons, MSc, <br> &nbsp; PhD, other)? other
Consider for a student <br> &nbsp; award (Yes / No)? No
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? Yes

Primary author

Prof. Andre Strydom (University of Johannesburg)

Presentation Materials