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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We have synthesized single crystals of Na_2IrO_3 and studied their structure,transport, magnetic, and thermal properties using powder x-ray diffraction(PXRD), electrical resistivity, isothermal magnetization M versus magneticfield H, magnetic susceptibility \chi versus temperature T, and heat capacity Cversus T measurements. Na_2IrO_3 crystallizes in the monoclinic \emph{C2/c}(No. 15) type structure which is made up of Na and NaIr_2O_6 layers alternatelystacked along the c axis. The \chi(T) data show Curie-Weiss behavior at high T> 200K with an effective moment \mu_eff = 1.82(1) \mu_B indicating an effectivespin S_eff = 1/2 on the Ir^4+ moments. A large Weiss temperature \theta = -116(3)K indicates substantial antiferromagnetic interactions between theseS_eff = 1/2, Ir^4+ moments. Sharp anomalies in \chi(T) and C(T) data indicatethat Na_2IrO_3 undergoes a transition into a long-range antiferromagneticallyordered state below T_N = 15 K. The magnetic entropy at T_N is only about 20%of what is expected for S_eff = 1/2 moment ordering. The reduced entropy andthe small ratio T_N/\theta \approx 0.13 suggest geometrical magneticfrustration and/or low-dimensional magnetic interactions in Na_2IrO_3. In planeresistivity measurements show insulating behavior. This together with the localmoment magnetism indicates that bulk Na_2IrO_3 is a Mott insulator.

Antiferromagnetic Mott insulating state in single crystals of the hexagonal lattice material Na2IrO3