@inbook{582ba2bc8e484519936c52c17a9c855d,
title = "Magnetoresistance in HTSC far above Tc: fluctuations versus normal-state contributions",
abstract = "We discuss the temperature dependence of the anisotropic magnetoresistance in high temperature superconductors with a focus on the magnetoresistance at temperatures significantly above T/sub c/. Recent results on YBa/sub 2/Cu/sub 3/O/sub 7- delta / thin films and single crystals are analyzed and measurements of the in-plane and out-of-plane magnetoresistance in optimally doped Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+x/ single crystals are reported. The in-plane magnetoresistance of both YBa/sub 2/Cu/sub 3/O/sub 7- delta / and Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+x/ is positive for magnetic fields oriented perpendicular and parallel to the current. The out-of-plane magnetoresistance of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+x/ is negative from 94 to 180 K. The results are discussed considering the magnetic-field suppression of superconducting fluctuations including the Aslamazov-Larkin and Maki-Thompson terms, the normal-state magnetoresistance of quasiparticles, and the reduction of the quasiparticle density of states due to condensation into superconducting fluctuations. A crossover from fluctuation-induced in-plane magnetoresistance close to T/sub c/ to the quasiparticle effect was found around 1.25 T/sub c/. The out-of-plane magnetoresistance is dominated by the density-of-states contribution. All results indicate that superconducting fluctuations persist up to at least 2T/sub c/.",
keywords = "barium-compounds; bismuth-compounds; calcium-compounds; fluctuations-in-superconductors; high-temperature-superconductors; magnetoresistance-; strontium-compounds; superconducting-thin-films; yttrium-compounds magnetoresistance-; HTSC-; fluctuations-; normal-state-contributions; temperature-dependence; anisotropic-magnetoresistance; high-temperature-superconductors; YBa-sub-2-Cu-sub-3-O-sub-7-delta-; Bi-sub-2-Sr-sub-2-CaCu-sub-2-O-sub-8+x-; magnetic-field-suppression; superconducting-fluctuations; quasiparticle-density-of-states; 94-to-180-K; YBa-sub-2-Cu-sub-3-O-sub-7-; Bi-sub-2-Sr-sub-2-CaCu-sub-2-O-sub-8-",
author = "W. Lang and G. Heine and W. Liebich and Wang, \{X. L.\} and Wang, \{X. Z.\}",
note = "Fluctuation-Phenomena-in-High-Temperature-Superconductors.-Proceedings-of-a-NATO-Advanced-Research-Workshop. 1997: 81-90 Netherlands Conference-Paper English",
year = "1997",
doi = "10.1007/978-94-011-5536-6\_6",
language = "English",
isbn = "978-94-010-6331-9",
series = "NATO Science Series. Partnership Sub-Series 3: High Technologies",
publisher = "Kluwer Academic Publishers",
pages = "81--90",
editor = "Marcel Ausloos and Varlamov, \{Andrei A.\}",
booktitle = "Fluctuation Phenomena in High Temperature Superconductors",
}