Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic field dependent specific heat and enhanced Wilson ratio in
  strongly correlated layered cobalt oxide   We have investigated the low temperature specific heat properties as a
function of magnetic field in the strongly correlated layered cobalt oxide
[BiBa$_{0.66}$K$_{0.36}$O$_2$]CoO$_2$. These measurements reveal two kinds of
magnetic field dependent contributions in qualitative agreement with the
presence of a previously inferred magnetic Quantum Critical Point (QCP). First,
the coefficient of the low temperature T$^3$ behavior of the specific heat
turns out to sizeably decrease near a magnetic field consistent with the
critical value reported in a recent paper. In addition, a moderate but
significant enhancement of the Sommerfeld coefficient is found in the vicinity
of the QCP suggesting a slight increase of the electronic effective mass. This
result contrasts with the divergent behavior of the previously reported Pauli
susceptibility. Thus, a strongly enhanced Wilson ratio is deduced, suggesting
efficient ferromagnetic fluctuations in the Fermi liquid regime which could
explain the unusual magnetic field dependent specific heat. As a strong check,
the high magnetic field Wilson ratio asymptotically recovers the universal
limit of the local Fermi liquid against ferromagnetism.

23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ