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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

An $S=1/2$ ferromagnetic (F) - antiferromagnetic (AF) random alternatingHeisenberg quantum spin chain model is investigated in connection to itsrealization compound: (CH$_3$)$_2$CHNH$_3$Cu(Cl$_x$Br$_{1-x}$)$_3$. Theexchange interaction bonds have alternating strong F-AF random bonds and weakuniform AF bonds. Using the quantum Monte Carlo method we have found that theexcitation energy gap closes and the uniform AF order becomes critical in theintermediate concentration region. This finding explains the experimentalobservation of the magnetic transition by considering weak interchaininteractions. Present results suggest that the uniform AF order survives evenin the presence of randomly located ferromagnetic bonds. This may be a newquantum effect.Comment: 9 pages, 11 figure

Criticality of the uniform magnetic order in a ferromagnetic-antiferromagnetic random alternating quantum spin chain