Crystallographic and magnetic structure of UNi${}_4$${}^{11}$B

Abstract

We present an extensive powder and single-crystal neutron scattering investigation of the crystallographic structure and magnetic order of the frustrated metallic $f$-electron magnet UNi${}_4$B. We carry out a full refinement of the crystallographic structure and conclude that the low-temperature lattice symmetry is orthorhombic (space group Pmm2; cell parameters: $a=6.963(4)\mathring{A}$ , $b=14.793(9)\mathring{A}$ , $c=17.126(8)\mathring{A}$). We determine the magnetically ordered structure, concluding that below $T_{\mathrm{N}}=19.5\mathrm{K}$ the material undergoes a transition into a partially ordered antiferromagnetic state. The magnetic structure is consistent with the existence of toroidal order in this material. We further test the proposal of a second magnetic transition occurring at $330\mathrm{mK}$, concluding that the thermodynamic anomalies observed at these temperatures do not reflect modifications of the magnetic structure. Our study provides a consistent picture of the interrelationship of structural and magnetic properties in the frustrated magnet UNi${}_4$B previously unresolved.

arXiv commentSubmitted to Phys. Rev. B

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• Magnetic Toroidal Moment under Partial Magnetic Order in Hexagonal Zigzag-Chain Compound Ce${}_3$TiBi${}_5$
• Noncollinear magnetic order, in-plane anisotropy, and magnetoelectric coupling in a pyroelectric honeycomb antiferromagnet Ni${}_2$Mo${}_3$O${}_8$
• High-resolution neutron diffraction determination of noncollinear antiferromagnetic order in the honeycomb magnetoelectric Fe${}_4$Nb${}_2$O${}_9$