Non-destructive characterisation of dopant spatial distribution in cuprate superconductors

Ana-Elena Tutueanu*, Morten Sales*, Kira Lieberkind Eliasen, Monica-Elisabeta Lacatusu, Jean-Claude Grivel, Nikolay Kardjilov, I. Manke, Mark Krzyzagorski, Yasmine Sassa, Martin S. Andersson, Søren Schmidt, Kim Lefmann

*Corresponding author

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.
Translated title of the contributionIkke-ødelæggende karakterisering af dopingfordeling i cuprate superledere
Original languageEnglish
Article number1353691
JournalPhysica C: Superconductivity and its Applications
Volume2020
Issue number575
Number of pages6
ISSN0921-4534
DOIs
Publication statusPublished - 15 Aug 2020

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