Calculation of the magnetotransport for a spin-density-wave quantum critical theory in the presence of weak disorder
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2017
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We compute the Hall angle and the magnetoresistance of the spin-fermion model,
which is a successful phenomenological theory to describe the physics of the cuprates and ironbased superconductors within a wide range of doping regimes. We investigate both the role of the
spin-fermion interaction that couples the large-momentum antiferromagnetic fluctuations to the
so-called “hot-spots” at the Fermi surface and also of an effective higher-order composite operator
in the theory. The latter operator provides a scattering mechanism such that the momentum
transfer for the fermions close to the Fermi surface can be small. We also include weak disorder
that couples to both the bosonic order-parameter field and the fermionic degrees of freedom. Since
the quasiparticle excitations were shown in recent works to be destroyed at the “hot-spots” in the
low-energy limit of the model, we employ the Mori-Zwanzig memory matrix approach that permits
the evaluation of all transport coefficients without assuming well-defined Landau quasiparticles in
the system. We then apply this transport theory to discuss universal metallic-state properties as a
function of temperature and magnetic field of the cuprates from the perspective of their fermiology,
which turn out to be in qualitative agreement with key experiments in those materials.
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FREIRE, Hermann. Calculation of the magnetotransport for a spin-density-wave quantum critical theory in the presence of weak disorder. European Physical Society Letters (EPL), Bristol, v. 118, n. 5, e57003, 2017. DOI: 10.1209/0295-5075/118/57003. Disponível em: https://iopscience.iop.org/article/10.1209/0295-5075/118/57003. Acesso em: 18 set. 2023.