Thermoelectric power of overdoped Tl2201 crystals: charge density waves and T1 and T2 resistivities

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Baglo, JC 
Putzke, C 
Carrington, A 

jats:titleAbstract</jats:title> jats:pWe report measurements of the in-plane thermoelectric power (TEP) for an overdoped (OD) crystal of the single layer cuprate superconductor Tljats:sub2</jats:sub>Bajats:sub2</jats:sub>CuOjats:inline-formula jats:tex-math</jats:tex-math> <mml:math xmlns:mml="" overflow="scroll"> mml:msub <mml:mi /> mml:mrow mml:mn6</mml:mn> mml:mo+</mml:mo> mml:mix</mml:mi> </mml:mrow> </mml:msub> </mml:math> <jats:inline-graphic xmlns:xlink="" xlink:href="sustad1463ieqn1.gif" xlink:type="simple" /> </jats:inline-formula> (Tl2201) at several hole concentrations (jats:italicp</jats:italic>), from 300 or 400 K to below the superconducting transition temperature (jats:italicTjats:subc</jats:sub> </jats:italic>). For jats:italicp</jats:italic> = 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 jats:italicT</jats:italic> jats:sup1</jats:sup> and jats:italicT</jats:italic> jats:sup2</jats:sup> terms in the in-plane resistivity of similar crystals observed below 160 K. Two scenarios in which the jats:italicT</jats:italic> jats:sup1</jats:sup> scattering term is uniform or non-uniform around the Fermi surface are discussed. As found previously by others, for uniform scattering the jats:italicT</jats:italic> jats:sup1</jats:sup> terms give scattering rates (jats:italicτ</jats:italic> jats:sup−1</jats:sup>) at lower jats:italicp</jats:italic> that are somewhat larger than the Planckian value jats:inline-formula jats:tex-math</jats:tex-math> <mml:math xmlns:mml="" overflow="scroll"> mml:msub mml:mik</mml:mi> mml:miB</mml:mi> </mml:msub> mml:miT</mml:mi> mml:mrow mml:mo/</mml:mo> </mml:mrow> mml:miℏ</mml:mi> </mml:math> <jats:inline-graphic xmlns:xlink="" xlink:href="sustad1463ieqn2.gif" xlink:type="simple" /> </jats:inline-formula> and fall to zero for heavily OD crystals. Near 160 K, jats:italicτ</jats:italic> jats:sup−1</jats:sup> from the jats:italicT</jats:italic> jats:sup2</jats:sup> terms corresponds to the Planckian value.</jats:p>

51 Physical Sciences, 5104 Condensed Matter Physics
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Superconductor Science and Technology
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IOP Publishing
EPSRC (EP/K016709/1)