Tunneling spectra of submicron Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ intrinsic Josephson junctions: evolution from superconducting gap to pseudogap

Abstract

Tunneling spectra of near optimally doped, submicron Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ intrinsic Josephson junctions are presented, and examined in the region where the superconducting gap evolves into pseudogap. The spectra are analyzed using a self-energy model, proposed by Norman {\it et al.}, in which both quasiparticle scattering rate $\Gamma$ and pair decay rate ${\Gamma }_{\Delta }$ are considered. The density of states derived from the model has the familiar Dynes' form with a simple replacement of $\Gamma$ by ${\gamma }_{+}$ = ($\Gamma$ + ${\Gamma }_{\Delta }$)/2. The ${\gamma }_{+}$ parameter obtained from fitting the experimental spectra shows a roughly linear temperature dependence, which puts a strong constraint on the relation between $\Gamma$ and ${\Gamma }_{\Delta }$. We discuss and compare the Fermi arc behavior in the pseudogap phase from the tunneling and angle-resolved photoemission spectroscopy experiments. Our results indicate an excellent agreement between the two experiments, which is in favor of the precursor pairing view of the pseudogap.

7 pages, 6 figures

References in corpus (8)

• From Fermi Arcs to the Nodal Metal: Scaling of the Pseudogap with Doping and Temperature
• Protected nodes and the collapse of the Fermi arcs in high Tc cuprates
• Modeling the Fermi arc in underdoped cuprates
• Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4
• Checkerboard charge density wave and pseudogap in high-$T_c$ cuprates
• Gapless superconductivity and the Fermi arc in the cuprates
• Fermi arcs in cuprate superconductors: tracking the pseudogap below Tc and above T*
• Pseudogap Behavior Revealed in Interlayer Tunneling in Overdoped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$

Cited by in corpus (1)

• Counterintuitive Consequence of Heating in Strongly-Driven Intrinsic-Junctions of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Mesas