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

We show that the low-energy sector of the S=1/2, antiferromagnetic Heisenbergmodel on a one-dimensional lattice of coupled tetrahedra consists of 2^Nreplica of the spectrum of the dimerized Heisenberg chain, where N is thenumber of tetrahedra.  This provides a proof of the following properties: i) there is a residualground-state entropy per spin equal to 2^{1/4}; ii) there is a singlet-tripletgap as long as the coupling between the tetrahedra is smaller than the internalone. These properties are compared to available results on the pyrochlorelattice.Comment: 4 pages with 3 figure

Residual entropy and spin gap in a one-dimensional frustrated antiferromagnet