Out-of-plane magnetoresistance of Bi₂Sr₂CaCu₂O_8+x single crystals: probing the fluctuation-induced pseudogap in the density of states

Autor(en)

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

Abstrakt

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.

Organisation(en)

Elektronische Materialeigenschaften

Journal

Physica C: Superconductivity and its Applications

Band

282-287

Seiten

1561-1562

Anzahl der Seiten

2

ISSN

0921-4534

DOI

https://doi.org/10.1016/S0921-4534(97)00927-1

Publikationsdatum

1997

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/410388c1-8325-419d-8fdb-012aed213b65