From vak@wuphys.wustl.edu Fri Apr  8 19:01:37 2005
Date: Fri, 8 Apr 2005 15:56:32 -0500 (CDT)
From: Victor Khodel <vak@wuphys.wustl.edu>
To: Piers Coleman <coleman@physics.rutgers.edu>
Cc: vickhod@yahoo.com
Subject: Re: QPT05 Thursday discussion.

Dear Piers
 This is my list of questions to the quantum critical point.

I Are critical indices  characterizing the QCP in  2D liquid
He-3 and 2D electron gas,   the same  as those in heavy fermion metals?

II  Does the form of scaling H/T behavior of  YbRh2Si2 and CeRu2Si2 in the
QCP hold  i) in PuCoGa_5 ( at T>T_c), ii) in 2D liquid He-3?

III. Is the divergence of the effective mass the necessary condition for
 the non-Fermi-liquid behavior of Fermi systems obeying Landau theory
far from the  critical point?

IV. Is the persistence of the  Kadowaki-Woods relation the evidence for
the presence of the single band,  contributing to the specific heat and
resistivity as well?
(in the case of two bands, an additional factor m^2_l/m^2_h emerges, where
m_l is the light mass and m_h , the heavy one).
If so what is the mechanism, responsible for the linearity in T
of the resistivity \rho(T) close to the QCP?

V. The Curie-Weiss behavior of the magnetic susceptibility  close to
the QCP is known  to emerge due to  i)localization of carriers, or ii)
flattening of their single-particle   spectra. Is the measurement of the
Curie constant sufficient to distinguish between both mechanisms?

VI How to evaluate the change in entropy emerging in the QCP?

Best wishes
Victor