Non-destructive characterisation of dopant spatial distribution in cuprate superconductors
Artikel i vetenskaplig tidskrift, 2020

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.


Spatial doping distribution


Polarised neutron imaging


A. E. Ţuţueanu

Niels Bohr Institute

Institut Laue-Langevin

M. Sales

Danmarks Tekniske Universitet (DTU)

K. L. Eliasen

Roskilde Universitet (RUC)

M. E. Lǎcǎtuşu

Niels Bohr Institute

Danmarks Tekniske Universitet (DTU)

J. C. Grivel

Danmarks Tekniske Universitet (DTU)

N. Kardjilov


I. Manke


M. Krzyzagorski


Yasmine Sassa

Chalmers, Fysik, Materialfysik

Martin Andersson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Martin Andersson Group

Uppsala universitet

S. Schmidt

Danmarks Tekniske Universitet (DTU)

K. Lefmann

Niels Bohr Institute

Physica C: Superconductivity and its Applications

0921-4534 (ISSN)

Vol. 575 1353691



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