Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-07-27
Physics
Condensed Matter
Strongly Correlated Electrons
Proceedings of HFM-Conference, June 2000, Waterloo, Ontario, Canada To appear in Can. J. Phys
Scientific paper
10.1139/cjp-79-11-12-1469
These three metallic systems do not exhibit any magnetic ordering despite experiments show the existence of localized moments with large antiferromagnetic exchange: this is a consequence of the strong geometric frustration (Y(Sc)Mn_{2} and LiV_{2}O_{4} have the Pyrochlore structure, while beta-Mn has a more complicated frustrated structure). Another common feature is their very large specific heat coefficient \gamma =C/T (420 mJ mole^{-1} K^{-2} for LiV_{2}O_{4}). Several explanations have been proposed for this ''3d heavy fermion behavior'', including a 3d-Kondo effect. However the similarities between the three compounds indicate that frustration plays a big role. We propose a new model which takes into account the existence of two types of 3d-electrons (localized and itinerant) and a frustrated antiferromagnetic exchange between the localized 3d electrons.
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