Anomalous thermoelectric power of overdoped Bi2Sr2CaCu2O8 superconductor

作者：Awana V P S^*; Bains Jagdish Kumar; Okram G S; Soni Ajay; Ahluwalia P K; Kishan H

来源：Journal of Applied Physics, 2009, 106(9): 096102.

DOI：10.1063/1.3248265

All the samples possess single-phase character and their Superconducting transition temperatures (T-c(R=0)) are 85, 90, and 72 K, respectively for Bi2212-MQ, Bi2212-N-2, and Bi2212-O-2. Though the Bi2212-MQ and Bi2212-N-2 samples are in near optimum doping regime, the Bi2212-O-2 is anoverdoped sample. T-c(S=0) Values obtained through S(T) data are also in line with those determined from the temperature dependence of resistance (T-c(R=0))) and dc magnetization (T-c(dia)). Interestingly, S(T) behavior of the optimally doped Bi2212-MQ and Bi2212-N-2 samples is seen to be positive in whole temperature range, the same is found negative for the overdoped Bi2212-O-2 sample above T-c(S=0). This anomalous S(T) behavior is seen in the light of the recent band structure calculations and the ensuing split Fermi surface as determined by angle-resolved photoelectron spectroscopy.

• 出版日期2009-11-1