Effects of the pseudo-gap on the field-induced kinetic energy density of Bi2Sr2CaCu2O8+δ single crystals
| Autor: | J. P. Peña, Milton A. Tumelero, V. N. Vieira, L.F. Lopes, Jacob Schaf, Paulo Pureur |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Van Hove singularity General Physics and Astronomy Kinetic energy 01 natural sciences 010305 fluids & plasmas Superfluidity Magnetization Condensed Matter::Superconductivity 0103 physical sciences Density of states Condensed Matter::Strongly Correlated Electrons Cuprate 010306 general physics Pseudogap |
| Zdroj: | Physics Letters A. 383:2519-2524 |
| ISSN: | 0375-9601 |
| Popis: | We report on magnetization experiments from which we obtain the field-induced kinetic energy density, E k , in the superconducting phase of several Bi2Sr2CaCu2O 8 + δ single crystal samples. The kinetic energy magnitude changes according to the characteristic reduction of the single-electron density of states produced by the pseudogap in the underdoped limit. Moreover, a remarkable peak of E k occurring at the specific holes density p ∼ 0.18 is related to a van Hove singularity due to the pseudogap closure. We also extracted the superfluid density, ρ s . We conclude that E k and ρ s are related to the pseudogap energy scale. This result is understood as an evidence of the coexistence between superconductivity and the pseudogap phenomenon in the Bi2Sr2CaCu2O 8 + δ cuprate compound. |
| Databáze: | OpenAIRE |
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