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

We report a comprehensive investigation of the magnetism of the $S$ = 3/2triangular-lattice antiferromagnet, $\alpha$-CrOOH(D) (delafossites green-greypowder). The nearly Heisenberg antiferromagnetic Hamiltonian ($J_1$ $\sim$ 23.5K) with a weak single-ion anisotropy of $|D|$/$J_1$ $\sim$ 4.6% isquantitatively determined by fitting to the electron spin resonance (ESR)linewidth and susceptibility measured at high temperatures. The weak single-ionanisotropy interactions, possibly along with other perturbations, e.g.next-nearest-neighbor interactions, suppress the long-range magnetic order andrender the system disordered, as evidenced by both the absence of any clearmagnetic reflections in neutron diffraction and the presence of the dominantparamagnetic ESR signal down to 2 K ($\sim$ 0.04$J_1$$S^2$), where the magneticentropy is almost zero. The power-law behavior of specific heat ($C_m$ $\sim$$T^{2.2}$) observed below the freezing temperature of $T_f$ = 25 K in$\alpha$-CrOOH or below $T_f$ = 22 K in $\alpha$-CrOOD is insensitive to theexternal magnetic field, and thus is consistent with the theoretical predictionof a gapless U(1) Dirac quantum spin liquid (QSL) ground state. At lowtemperatures, the spectral weight of the low-energy continuous spin excitationsaccumulates at the K points of the Brillouin zone, e.g. $|\mathbf{Q}|$ =4$\pi$/(3$a$), and the putative Dirac cones are clearly visible. Our work is afirst step towards the understanding of the possible Dirac QSL ground state inthis triangular-lattice magnet with $S$ = 3/2.

Evidence for a gapless Dirac spin-liquid ground state in a spin-3/2 triangular-lattice antiferromagnet