Out-of-plane magnetoresistance of Bi2Sr2CaCu2O8+x single crystals: probing the fluctuation-induced pseudogap in the density of states

G. Heine, W. Lang, X. L. Wang, X. Z. Wang

Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed


We report on measurements of the out-of-plane resistivity and magnetoresistance in the normal state region above the critical temperature T/sub c/ in optimally doped and overdoped Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+x/ single crystals. The temperature dependence of the out-of-plane resistivity indicates thermally activated hopping of carriers over an interplane pseudogap. In the overdoped samples this behavior gradually changes to a metallic-like resistivity at higher temperatures. The out-of-plane magnetoresistance (measured with the magnetic field parallel to the current) is negative, indicating a shrinking of the pseudogap in magnetic fields. Our experimental results are in good accordance with a recent model for the reduction of the quasiparticle density of states due to condensation of quasiparticles into superconducting fluctuations. Such a fluctuation-induced pseudogap is expected to be suppressed in high magnetic fields according to a reduction of the in-plane fluctuation amplitude.
Seiten (von - bis)1561-1562
FachzeitschriftPhysica C: Superconductivity and its Applications
PublikationsstatusVeröffentlicht - 1997

ÖFOS 2012

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