English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The $S=1/2$ antiferromagnetic Heisenberg spin chain compound Sr$_2$CuO$_3$doped with $1 \%$ and $2 \%$ of Ni impurities has been studied by means of$^{63}$Cu nuclear magnetic resonance. A strong decrease of the spin-latticerelaxation rate $T_1^{-1}$ at low temperatures points toward a spin gap, whilea stretching exponent $\lambda < 1$ and a frequency dependence of $T_1^{-1}$indicate that this spin gap varies spatially and should rather be characterizedas a spin pseudogap. The magnitude of the spin pseudogap scales with dopinglevel. Our results therefore evidence the finite-size character of thisphenomenon. Moreover, an unusual narrowing of the low temperature NMR linesreveals the suppression of the impurity-induced staggered paramagnetic responsewith increasing doping level.

Suppression of the impurity-induced local magnetism by the opening of a spin pseudogap in Ni-doped Sr$_2$CuO$_3$