Academic Journal
Nonlinear c-axis transport in Bi2Sr2CaCu2O8+delta from two-barrier tunneling
| العنوان: | Nonlinear c-axis transport in Bi2Sr2CaCu2O8+delta from two-barrier tunneling |
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| المؤلفون: | GIURA, Maurizio, N. Pompeo, E. Silva |
| المساهمون: | Giura, Maurizio, N., Pompeo, E., Silva |
| بيانات النشر: | AMER PHYSICAL SOC |
| سنة النشر: | 2009 |
| المجموعة: | Sapienza Università di Roma: CINECA IRIS |
| مصطلحات موضوعية: | bismuth compound, calcium compound, electronic density of state, high-temperature superconductor, strontium compound, superconducting energy gap, superconducting transition temperature, tunnelling, tunnelling spectra |
| الوصف: | Motivated by the peculiar features observed through intrinsic tunneling spectroscopy of Bi2Sr2CaCu2O8+delta mesas in the normal state, we have extended the normal-state two-barrier model for the c-axis transport [M. Giura , Phys. Rev. B 68, 134505 (2003)] to the analysis of dI/dV curves. We have found that the purely normal-state model reproduces all the following experimental features: (a) the parabolic V dependence of dI/dV in the high-T region (above the conventional pseudogap temperature), (b) the emergence and the nearly voltage-independent position of the "humps" from this parabolic behavior by lowering the temperature, and (c) the crossing of the absolute dI/dV curves at a characteristic voltage V-x. Our findings indicate that conventional tunneling can be at the origin of most of the uncommon features of the c-axis transport in Bi2Sr2CaCu2O8+delta. We have compared our calculations to experimental data taken in severely underdoped and slightly underdoped Bi2Sr2CaCu2O8+delta small mesas. We have found good agreement between the data and the calculations, without any shift of the calculated dI/dV on the vertical scale. In particular, in the normal state (above T-*) simple tunneling reproduces the experimental dI/dV quantitatively. Below T-* quantitative discrepancies are limited to a simple rescaling of the voltage in the theoretical curves by a factor similar to 2. The need for such modifications remains an open question, that might be connected to a change of the charge of a fraction of the carriers across the pseudogap opening. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000265943200101; volume:79; firstpage:144504; numberofpages:7; journal:PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS; http://hdl.handle.net/11573/29056; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-65149106103; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000265943200101&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a; http://www.scopus.com/inward/record.url?eid=2-s2.0-65149106103&partnerID=65&md5=225bc20004c14b48b31a0528f62f6cca |
| DOI: | 10.1103/physrevb.79.144504 |
| الاتاحة: | http://hdl.handle.net/11573/29056 https://doi.org/10.1103/physrevb.79.144504 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000265943200101&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://www.scopus.com/inward/record.url?eid=2-s2.0-65149106103&partnerID=65&md5=225bc20004c14b48b31a0528f62f6cca |
| رقم الانضمام: | edsbas.297697CA |
| قاعدة البيانات: | BASE |
| DOI: | 10.1103/physrevb.79.144504 |
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