Effects of the pseudo-gap on the field-induced kinetic energy density of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ single crystals

Lutiene F. Lopes; Jully P. Peña; Milton A. Tumelero; Jacob Schaf; Valdemar N. Vieira; Paulo Pureur

doi:10.1016/j.physleta.2019.05.014

paper

Effects of the pseudo-gap on the field-induced kinetic energy density of Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ single crystals

arXiv:2008.10674 · doi:10.1016/j.physleta.2019.05.014

Abstract

We report on magnetization experiments from which we obtain the field-induced kinetic energy density, $E_{k}$ , in the superconducting phase of several Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ 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 $p \sim 0.18$ 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 Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ cuprate compound.

Effects of the pseudo-gap on the field-induced kinetic energy density of Bi2​Sr2​CaCu2​O8+δ​ single crystals

Abstract

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Effects of the pseudo-gap on the field-induced kinetic energy density of Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ single crystals