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

Cu(pz)2(ClO4)2 (with pz denoting pyrazine, C4H4N2) is among the bestrealizations of a two-dimensional spin-1/2 square-lattice antiferromagnet.Below T_N = 4.21 K, its weak interlayer couplings induce a 3D magnetic order,strongly influenced by external magnetic fields and/or hydrostatic pressure.Previous work, focusing on the [H, T] phase diagram, identified a spin-floptransition, resulting in a field-tunable bicritical point. However, theinfluence of external pressure has not been investigated yet. Here we explorethe extended [p, H, T] phase diagram of Cu(pz)2(ClO4)2 under pressures up to 12kbar and magnetic fields up to 7.1 T, via magnetometry and 35Cl nuclearmagnetic resonance (NMR) measurements. The application of magnetic fieldsenhances T_XY , the crossover temperature from the Heisenberg to the XY model,thus pointing to an enhancement of the effective anisotropy. The appliedpressure has an opposite effect [dT_N/dp = 0.050(8) K/kbar], as it modifiesmarginally the interlayer couplings, but likely changes more significantly theorbital reorientation and the square-lattice deformation. This results in aremodeling of the effective Hamiltonian, whereby the field and pressure effectscompensate each other. Finally, by comparing the experimental data withnumerical simulations we estimate T_BKT, the temperature of theBerezinskii-Kosterlitz-Thouless topological transition and argue why it isinaccessible in our case.

Pressure and magnetic field effects on a quasi-2D spin-1/2 Heisenberg antiferromagnet