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Resistivity in Cuprates and the Pseudogap

Sven Larsson (Institutionen för kemi och kemiteknik)
Journal of Superconductivity and Novel Magnetism (1557-1939). Vol. 30 (2017), 3, p. 777-782.
[Artikel, refereegranskad vetenskaplig]

The temperature dependence of resistivity (rho) in the normal state of La2-x Sr (x) CuO4 is calculated from electron transfer (ET) rates. The minimum at about 100 K for doping levels less than 6 % is characteristic for all cuprates. The resistivity depends on ET between Cu(III) and Cu(II) sites. For T < 300 K, the resistivity is proportional to T (3/2). The more than linear increase of rho for T > 100 K depends on increased kinetic energy in a Landau avoided crossing. The agreement with experimental data is convincing. The behaviour for T -> 0 can be explained as nuclear tunnelling. For T > 400 K, rho bends down, presumably because the pseudogap is overcome at a higher kinetic energy.

Nyckelord: Cuprate, Resistivity minimum, Superconducting gap, Pseudogap, Landau-Pekar model, Marcus model, Jortner model, Nuclear tunnelling



Denna post skapades 2017-03-31. Senast ändrad 2017-03-31.
CPL Pubid: 248740

 

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Institutionen för kemi och kemiteknik

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Chalmers infrastruktur