AC loss of Ag–Bi2223 tapes

Luo, H.; Lin, Ji; Ding, Shuo

doi:10.1016/s0921-4534(02)02223-2

Cited by 5 publications

(1 citation statement)

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“…This is perhaps why the T -dependent R H is not widely accepted as the evidence for n(T ) ∝ T . However R H = 0 can be understood with a two-carrier model as a result of compensation [19][20][21][22]. And as long as one carrier dominates the transport, R H is still ∝ 1/n although e c cR H = 1/n no longer holds.…”

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confidence: 99%

An alternative theory on relaxation rates in cuprate superconductors

Luo

Miley²

2008

J. Phys.: Condens. Matter

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Transport properties of high transition temperature (high-T(c)) superconductors apparently demonstrate two distinct relaxation rates in the normal state. We propose that this superficial inconsistence can be resolved with an effective carrier (quasiparticle) density n almost linear in temperature T. Experimental evidence both for and against this explanation is analyzed and we conclude that this offers a clear yet promising scenario. Band structure calculation was utilized to determine the Fermi surface topology of the cuprate superconductor versus doping. The results demonstrate that an electron-like portion of the Fermi surface exists in a wide range of doping levels even for a p-type superconductor, exemplified by La(2-x)Sr(x)CuO(4-δ) (LSCO). Such electron-like segments have also been confirmed in recent photoemission electron spectroscopy. The Coulomb interaction between electron-like and hole-like quasiparticles then forms a bound state, similar to that of an exciton. As a result the number of charge carriers upon cooling temperature is decreased. A quantum mechanical calculation of scattering cross section demonstrates that a T(2) relaxation rate is born out of an electron-hole collision process. Above the pseudogap temperature T(*) the normal state of high-T(c) cuprates is close to a two-component Fermi liquid. It, however, assumes non-Fermi-liquid behavior below T(*).

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confidence: 99%