Synthesis, structure and properties of layered phosphide nitrides $Ak$Th$_2$Mn$_4$P$_4$N$_2$ ($Ak$ = Rb, Cs)

Bai-Zhuo Li; Si-Qi Wu; Zhi-Cheng Wang; Cao Wang; Guang-Han Cao

doi:10.1002/cjoc.202100341

paper

Synthesis, structure and properties of layered phosphide nitrides $A k$ Th $_{2}$ Mn $_{4}$ P $_{4}$ N $_{2}$ ( $A k$ = Rb, Cs)

arXiv:2107.14375 · doi:10.1002/cjoc.202100341

Abstract

We report the design, synthesis, structure, and properties of two complex layered phosphide nitrides, $A k$ Th $_{2}$ Mn $_{4}$ P $_{4}$ N $_{2}$ ( $A k$ = Rb, Cs), which contain anti-fluorite-type [Mn $_{2}$ P $_{2}$ ] bilayers separated by fluorite-type [Th2N2] layers as a result of the intergrowth between AkMn $_{2}$ P $_{2}$ and ThMnPN. The new compounds are featured with an intrinsic hole doping associated with the interlayer charge transfer and a built-in chemical pressure from the [Th $_{2}$ N $_{2}$ ] layers, both of which are reflected by the changes in the lattice and the atomic position of phosphorus. The measurements of magnetic susceptibility, electrical resistivity, and specific heat indicate existence of local moments as well as itinerant electrons in relation with d-p hybridizations. The expected dominant antiferromagnetic interactions with enhanced d-p hybridizations were demonstrated by the first-principles calculations only when additional Coulomb repulsions are included. The density of states at the Fermi level derived from the specific-heat analysis are 3.5 and 7.5 times of the calculated ones for Ak = Rb and Cs, respectively, suggesting strong electron correlations in the title compounds.

arXiv comment12 pages, 5 figures, 3 tables; Supporting information available on request

Synthesis, structure and properties of layered phosphide nitrides AkTh2​Mn4​P4​N2​ (Ak = Rb, Cs)

Abstract

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Synthesis, structure and properties of layered phosphide nitrides $A k$ Th $_{2}$ Mn $_{4}$ P $_{4}$ N $_{2}$ ( $A k$ = Rb, Cs)