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Probing the Phase Diagram of Bi 2 Sr 2 CaCu 2 O 8+ with Tunneling Spectroscopy
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ozyuzer, Lutfi Zasadzinski, John F. Gray, Kenneth E. Hinks, David G. Miyakawa, N. |
| Copyright Year | 2002 |
| Abstract | Tunneling measurements are performed on Ca- rich single crystals of Bi2Sr2CaCu2O8+� (Bi2212), with various oxygen doping levels, using a novel point contact method. At 4.2 K, SIN and SIS tunnel junctions are obtained with well-define d quasiparticle peaks, robust dip and hump features and in some cases Josephson currents. The doping dependence of tunneling conductances of Ca-rich Bi2212 are analyzed and compared to stoichiometric Bi2212. A similar profile of energy gap vs. do ping concentration is found although the Ca-rich samples have a slighly smaller optimum Tc and therefore smaller gap values for any doping level. The evolution of tunneling conductance peak height to background ratios with hole concentration are compared. For a given doping level, the Ca-rich spectra showed more broadened features compared to the stoichiometric coun- terparts, most likely due to increased disorder from the excess Ca. Comparison of the dip and hump features has provided some potential insights into their origins. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://publications.anl.gov/anlpubs/2002/08/44073.pdf |
| Alternate Webpage(s) | http://arxiv.org/pdf/cond-mat/0301335v1.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
