Thermoelectric power of overdoped Tl2201 crystals: Charge density waves and T^1 and T^2 resistivities
arxiv(2024)
摘要
We report measurements of the in-plane thermoelectric power (TEP) for an
overdoped (OD) crystal of the single layer cuprate superconductor
Tl_2Ba_2CuO_6+x (Tl2201) at several hole concentrations (p), from 300
or 400 K to below the superconducting transition temperature (T_c). For p =
0.192 and 0.220, small upturns in the TEP below 150 K are attributed to the
presence of charge density waves (CDW) detected by resonant inelastic X-ray
scattering studies. This suggests that measurement of the TEP could provide a
simple and effective guide to the presence of a CDW. Over a certain temperature
range, often strongly restricted by the CDW, the TEP is consistent with the
Nordheim-Gorter rule and the T^1 and T^2 terms in the in-plane resistivity
of similar crystals observed below 160 K. Two scenarios in which the T^1
scattering term is uniform or non-uniform around the Fermi surface are
discussed. As found previously by others, for uniform scattering the T^1
terms give scattering rates (τ^-1) at lower p that are somewhat larger
than the Planckian value k_B T/ħ and fall to zero for heavily OD
crystals. Near 160 K, τ^-1 from the T^2 terms corresponds to the
Planckian value.
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