1999/06/06 by Weimin Chen, Chen, Weimin, J. P. Franck +3
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic Properties and Applications #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/9906079
Fine-tuned figures and some wording; 4 pages plus 4 figs. Submitted to Physica C
openalex publication_date 1999/06/06 · arxiv created 1999/08/31 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report anomalous features in the normal-state resistivity of single crystalline Bi2Sr2CaCu2O8 whiskers near some characteristic temperature T* \~ 250 K. From these varied oxygen-doping samples, the resistance (R) was found to deviate \it upward from the linear-T relation for T< T*, while R keeps decreasing with T. The deviation, ΔR ≡ R - (a + bT), reaches a maximum in a temperature range of ~ 25 K just before R-T follows the well-known descent associated with the pseudogap opening in the underdoped samples. A second kink was also found in some samples immediately following the first one, resulting in an S-shaped feature in the R-T curve. The resistance then resumes nearly linear-T decrease below the anomalies in contrast to the first case. We interpret these features as being related to crystal structure transformation (or lattice distortion), as was evidenced in thermal and elastic property measurements. These structural instabilities seem to be connected to the subsequent dynamics as T is further lowered.