Abstract
We discuss the temperature variation of various quantities in the vicinity of a magnetic quantum critical point within the framework of the spin fluctuation theory. It differs from the Fermi liquid behavior which one expects in normal metals. The reason for this deviation is the presence of the low lying critically damped spin fluctuations in these systems above Tc. The deviation depends upon the space dimension as well as on whether the order parameter is a conserved (ferromagnetic) or a non-conserved (antiferromagnetic) quantity. Away from the critical point there arises an energy scale below which the fermionic behavior is restored. This crossover behavior has an interesting consequence for specific heat of some correlated fermionic systems like liquid 3He and some heavy fermion materials. In these systems the specific heat versus temperature curves for various pressures or magnetic field have been seen to cross at a point. Within the spin fluctuation theory we find that when the energy scale is a homogeneous function of pressure or magnetic field there is crossing of specific heat at a point.
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Mishra, S.G. (2001). Band Magnetism near a Quantum Critical Point. In: Baberschke, K., Nolting, W., Donath, M. (eds) Band-Ferromagnetism. Lecture Notes in Physics, vol 580. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44610-9_11
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DOI: https://doi.org/10.1007/3-540-44610-9_11
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