Robust intrinsic electronic superconducting phases in underdoped La_{2-x}Sr_xCuO4 single crystals

TL;DR

This study investigates the intrinsic superconducting phases in underdoped La_{2-x}Sr_xCuO4 crystals, revealing robust, field-induced phases at specific doping levels linked to electronic lattice structures, advancing understanding of high-temperature superconductivity.

Contribution

It identifies intrinsic superconducting phases at specific doping levels and demonstrates their robustness under magnetic fields, highlighting their fundamental role in high-temperature superconductivity.

Findings

Intrinsic phases at 'magic' doping are robust up to 5 Tesla.

Field induces a transition to intrinsic Tc phases at 15 K and 30 K.

Intrinsic phases are associated with commensurate electronic lattice structures.

Abstract

We have measured the superconducting critical temperature (Tc) and the diamagnetic susceptibility of La2-xSrxCuO4 single crystals in various magnetic fields. We observed a field-induced evolution from an apparent Tc phase to an intrinsic Tc1 = 15 K or Tc2 = 30 K phase characterized by "magic" hole concentration which is commensurate with that of a two dimensional electronic lattice. The onset Tc of the intrinsic superconducting phases remains robust up to H = 5 Tesla. We suggest that the intrinsic superconducting phases at "magic" doping concentrations are the pristine electronic phases of high temperature superconductivity.