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 study a spin-1/2 model with triangular XXZ-clusters on theorthogonal-dimer chain in the presence of an external magnetic field. First, wediscuss the case where the triangular clusters are coupled via intermediate"classical" Ising spins. Diagonalization of the triangular XXZ-clusters yieldsthe exact ground states; finite-temperature properties are computed exactly byan additional transfer-matrix step. A detailed analysis reveals a large varietyof ground states at magnetization M equal to fractions 0, 1/4, and 1/2 of thesaturation magnetization M=1. Some of these ground states break translationalsymmetry spontaneously and give rise to doubling of the unit cell. In a secondpart we present complementary numerical data for the spin-1/2 Heisenberg modelon the orthogonal-dimer chain. We analyze several examples of T=0 magnetizationcurves, entropy as a function of temperature T and magnetic field, and theassociated magnetic cooling rate. Comparison of the two models shows that incertain situations the simplified exactly solvable model yields a qualitativelyor sometimes even quantitatively accurate description of the more challengingquantum model, including a case which may be relevant to experimentalobservations of an enhanced magnetocaloric effect in the two-dimensionalcompound SrCu2(BO3)2.

Magneto-thermal properties of the Heisenberg-Ising orthogonal-dimer chain with triangular XXZ-clusters