Quantum-critical-point fluctuations

We like to mention that at a quantum critical point where antiferromagnetic order is on the verge to disappear, the value of a is expected to be 3/2, whereas a value of 5/3 hints to the presence of ferromagnetic fluctuations. The actual experimental value for a for x> 0.006 is equal to 1.6, i.e. in between the two above given values. Specific-heat... 

Here r measures the (almost T-independent) distance from the quantum critical point, F denotes the characteristic energy scale of the fluctuations and c, are constants. The frequency magnetic coq vanishes at the ordering vector Q of the magnetic stmcture. In the dirty limit the variation with temperature of the resistivity is given by... 

From the previous discussion of experimental evidence the superconducting mechanism via ferromagnetic fluctuations can be ruled out since the ferromagetic polarization at pm where Tc is largest is still 65% of the maximum value at ambient pressure (Pfleiderer and Huxley, 2002). Therefore models based on the FM quantum critical point scenario that follow the original work of Fay and Appel (1980) are not relevant for UGe2. On the other hand the phe-... 

These three critical points, namely the neglect of non-Coulombic contributions for solute atoms, a fluctuating charge distribution of the QM particles and electrostatic embedding of MM partial charges, lead to the formulation of the quantum mechanical charge field (QMCF) ansatz [54] which has been applied in molecular dynamics studies of various hydrated systems, recently. 

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