Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is the ground state of alpha-(BEDT-TTF)2MHg(SCN)4[M=K,Rb,Tl] a
  charge-density wave or a spin-density wave?   The nature of the low-temperature phase of the quasi-two-dimensional
conductors $\alpha-(BEDT-TTF)_2{M}Hg(SCN)_4$[{M}=K,Rb,Tl] is considered. It is
argued that the magnetic field dependence of the phase diagram is more
consistent with a charge-density wave, rather than a spin-density wave ground
state. The phase diagram of a charge-density wave in a magnetic field is
discussed using a Ginzburg-Landau free energy derived from microscopic theory.
New experiments are proposed to test the charge-density-wave hypothesis and
detect an additional high field phase.

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The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
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The categories of this paper are: supr-con
1
The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat