Magnetism and field-induced effects in the S = 5/2 honeycomb lattice antiferromagnet FeP3SiO11

Abstract

Quantum magnets based on honeycomb lattices with low-coordination number offer a viable ground to realize exotic emergent quantum excitations and phenomena arising from the interplay between competing magnetic interactions, spin correlations, and spatial anisotropy. However, unlike their low-spin analogues, high-spin honeycomb lattice antiferromagnets have remained comparatively less explored in the context of capturing the classical analogs of quantum phenomena. Herein, we report the crystal structure, magnetic susceptibility, specific heat, and electron spin resonance (ESR), complemented by ab initio density functional theory (DFT) calculations on polycrystalline samples of FeP3SiO11 wherein the Fe3+ ions decorate a nearly-perfect S = 5/2 honeycomb lattice without any site disorder among constituent atoms. Above 150 K, an antiferromagnetic Weiss temperature of - 12 K is observed consistent with DFT calculations, which suggest the presence of strong intra-planar nearest-neighbor and weaker inter-planar further nearest-neighbor exchange interactions. An anomaly at TN = 3.5 K in specific heat and magnetic susceptibility reveals the presence of a long-range ordered ground state in zero field. Above TN, ESR evidences short-range spin correlations and unsaturated magnetic entropy, while below TN unconventional excitations are seen via power-law specific heat. A spin-flop transition is observed in an applied field of Hc1 = 0.2 T. At higher applied fields, TN is gradually suppressed down to zero at Hc2 = 5.6 T with a 2D critical exponent 0.255. Above Hc2, a broad maximum in specific heat due to gapped magnon excitations indicates the emergence of an interesting nearly-polarized state dressed by a disordered state in the honeycomb lattice antiferromagnet FeP3SiO11.

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Cited by in corpus (6)

• Spin dynamics and 1/3 magnetization plateau in a coupled distorted diamond chain compound K2Cu3(MoO4)4
• Coexistence of anomalous spin dynamics and weak magnetic order in a chiral trillium lattice K2FeSn(PO4)3
• Possible Bose-Einstein condensation of magnons in a S = 5/2 honeycomb lattice
• Coexistence of static and dynamic local magnetic fields in an S = 3/2 honeycomb lattice antiferromagnet Co2Te3O8
• Multistage spin correlations in the $s$ = 1/2 stuffed hyper-star lattice Li${}_2$Cu${}_2$(MoO${}_4$)${}_3$
• Multistage development of short-range spin correlations and weak magnetic order in the two coupled trillium lattices of K2Fe2(MoO4)(PO4)2