Frustrated Spin One On A Diamond Lattice

Abstract

We report the discovery of a spin one diamond lattice in NiRh2O4. This spinel undergoes a cubic to tetragonal phase transition at T = 440 K that leaves all nearest neighbor interactions equivalent. In the tetragonal phase, magnetization measurements show a Ni2+ effective moment of p(eff) = 3.3(1) and dominant antiferromagnetic interactions with Θ(CW) = -11.3(7) K. No phase transition to a long-range magnetically ordered state is observed by specific heat measurements down to T = 0.1 K. Inelastic neutron scattering measurements on sub-stoichiometric NiRh2O4 reveal possible valence-bond behavior and show no visible signs of magnetic ordering. NiRh2O4 provides a platform on which to explore the previously unknown and potentially rich physics of spin one interacting on the diamond lattice, including the realization of theoretically predicted quantum spin liquid and topological paramagnet states.

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• Experimental Evidence for the Spiral Spin Liquid in LiYbO${}_2$
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• The Curious Case of NiRh${}_2$O${}_4$: A Spin-Orbit Entangled Diamond Lattice Paramagnet
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• Orientation-dependent stabilization of MgCr${}_2$O${}_4$ spinel thin films
• Electronic structure of the frustrated diamond lattice magnet NiRh${}_2$O${}_4$
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• Soft-Chemical Synthesis, Structure Evolution, and Insulator-to-Metal Transition in a Prototypical Metal Oxide, λ-RhO${}_2$
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• Phase transitions in the spin-1/2 Heisenberg antiferromagnet on the dimerized diamond lattice
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• Codimension-Two Spiral Spin-Liquid in the Effective Honeycomb-Lattice Compound Cs${}_3$Fe${}_2$Cl${}_9$
• Frustrated $J_1-J_2$ Diamond Lattice Antiferromagnet Co${}_2$Ti${}_3$O${}_8$ with a Vacancy-ordered Spinel Structure Synthesized via a Topochemical Reaction