Non-destructive characterisation of dopant spatial distribution in cuprate superconductors

A. E. Ţuţueanu*, Morten Sales, K. L. Eliasen, Monica-Elisabeta Lǎcǎtuşu, Jean-Claude Grivel, N. Kardjilov, I. Manke, M. Krzyzagorski, Y. Sassa, M. S. Andersson, Søren Schmidt, K. Lefmann

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Proper characterisation of investigated samples is vital when studying superconductivity as impurities and doping inhomogeneities can affect the physical properties of the measured system. We present a method where a polarised neutron imaging setup utilises the precession of spin-polarised neutrons in the presence of a trapped field in the superconducting sample to spatially map out the critical temperature for the phase transition between superconducting and non-superconducting states. We demonstrate this method on a superconducting crystal of the prototypical high-temperature superconductor (La,Sr)2CuO4. The results, which are backed up by complementary magnetic susceptibility measurements, show that the method is able to resolve minor variations in the transition temperature across the length of the LSCO crystal, caused by inhomogeneities in strontium doping.

Original languageEnglish
Article number1353691
JournalPhysica C: Superconductivity and its applications
Volume575
ISSN0921-4534
DOIs
Publication statusPublished - 2020

Keywords

  • Cuprates
  • Polarised neutron imaging
  • Spatial doping distribution
  • Superconductivity

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