Theory of partial quantum disorder in the stuffed honeycomb Heisenberg antiferromagnet

Seifert, Urban F. P.; Vojta, Matthias

doi:10.1103/physrevb.99.155156

Cited by 14 publications

(17 citation statements)

References 42 publications

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“…A similar seperation of ordered and disordered phases has also been reported for Cu 2 IrO 3 [29] and Li 2 RhO 3 [30]. Theoretical treatment of such phenomena revealed that the ground state is stabilized from competition between quantum fluctuation and frustration [31,32]. We wish to note the fact that a relatively large impurity phase is present in the compound, which could be the origin behind the anomaly around T C .…”

Section: Discussionsupporting

confidence: 72%

Co-existence of short- and long-range magnetic order in LaCo$_2$P$_2$

Forslund,

Andreica,

Ohta

et al. 2021

Preprint

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The ferromagnetic (FM) nature of the metallic LaCo2P2 was investigated with the positive muon spin rotation, relaxation and resonance (µ + SR) technique. Transverse and zero field µ + SR measurements revealed that the compound enters a long range FM ground state at TC = 130.91(65) K, consistent with previous studies. Based on the reported FM structure, the internal magnetic field was computed at the muon sites, which were predicted with first principles calculations. The computed result agree well with the experimental data. Moreover, although LaCo2P2 is a paramagnet at higher temperatures T > 160 K, it enters a short range ordered (SRO) magnetic phase for TC < T ≤ 160 K. Measurements below the vicinity of TC revealed that the SRO phase co-exists with the long range FM order at temperatures 124 ≤ T ≤ TC. Such co-existence is an intrinsic property and stems from competition between the 2D and 3D interactions/fluctuations.

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Section: Discussionsupporting

confidence: 72%

Co-existence of short- and long-range magnetic order in LaCo$_2$P$_2$

Forslund,

Andreica,

Ohta

et al. 2021

Preprint

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“…In the honeycomb structure family, frustration is known to cause partial magnetic disorder. This leads to a spin liquid or spin glass like ground states, which is often hidden behind a long-range magnetic ordering 22 – 24 . Here the SR technique is uniquely capable of detecting such mixed state, including its volume fractions.…”

Section: Resultsmentioning

confidence: 99%

Magnetism and ion diffusion in honeycomb layered oxide $${\hbox {K}_2\hbox {Ni}_2\hbox {TeO}_6}$$

Matsubara

Nocerino

Forslund

et al. 2020

Sci Rep

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In the quest for developing novel and efficient batteries, a great interest has been raised for sustainable K-based honeycomb layer oxide materials, both for their application in energy devices as well as for their fundamental material properties. A key issue in the realization of efficient batteries based on such compounds, is to understand the K-ion diffusion mechanism. However, investigation of potassium-ion (K$$^+$$ + ) dynamics in materials using e.g. NMR and related techniques has so far been very challenging, due to its inherently weak nuclear magnetic moment, in contrast to other alkali ions such as lithium and sodium. Spin-polarised muons, having a high gyromagnetic ratio, make the muon spin rotation and relaxation ($$\mu ^+$$ μ + SR) technique ideal for probing ions dynamics in these types of energy materials. Here we present a study of the low-temperature magnetic properties as well as K$$^+$$ + dynamics in honeycomb layered oxide material $${\hbox {K}_2\hbox {Ni}_2\hbox {TeO}_6}$$ K 2 Ni 2 TeO 6 using mainly the $$\mu ^+$$ μ + SR technique. Our low-temperature $$\mu ^+$$ μ + SR results together with complementary magnetic susceptibility measurements find an antiferromagnetic transition at $$T_{\mathrm{N}}\approx 27$$ T N ≈ 27 K. Further $${\mu}^{+}$$ μ + SR studies performed at higher temperatures reveal that potassium ions (K$$^+$$ + ) become mobile above 200 K and the activation energy for the diffusion process is obtained as $$E_{\mathrm{a}}=121 (13)$$ E a = 121 ( 13 ) meV. This is the first time that K$$^+$$ + dynamics in potassium-based battery materials has been measured using $$\mu ^+$$ μ + SR. Assisted by high-resolution neutron diffraction, the temperature dependence of the K-ion self diffusion constant is also extracted. Finally our results also reveal that K-ion diffusion occurs predominantly at the surface of the powder particles. This opens future possibilities for potentially improving ion diffusion as well as K-ion battery device performance using nano-structuring and surface coatings of the particles.

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“…The classical phase diagram of this model was found in Ref. 21, while previous work has also examined a region of partial (C sublattice) disorder near the honeycomb limit with only nearest neighbor couplings 15,[28][29][30][31] ; further neighbor couplings will remove this region of partial disorder as they induce independent C spin order.…”

Section: Introductionmentioning

confidence: 99%

Symmetric spin liquids on the stuffed honeycomb lattice

Sahoo

Flint

2020

Phys. Rev. B

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We use a projective symmetry group analysis to determine all symmetric spin liquids on the stuffed honeycomb lattice Heisenberg model. This lattice interpolates between honeycomb, triangular and dice lattices, always preserving hexagonal symmetry, and it already has one spin liquid candidate, TbInO3, albeit with strong spin-orbit coupling not considered here. In addition to the stuffed honeycomb lattice itself, we gain valuable insight into potential spin liquids on the honeycomb and triangular lattices, as well as how they might be connected. For example, the sublattice pairing state proposed on the honeycomb lattice connects to the uniform spinon Fermi surface that may be relevant for the triangular lattice with ring exchange, while there are no spin liquids competitive on both the J1 − J2 honeycomb and triangular lattice limits. In particular, we find three stuffed honeycomb descendants of the U(1) Dirac spin liquid widely believed to be found on the J1 − J2 triangular lattice. We also discuss how spin liquids near the honeycomb limit can potentially explain the physics of LiZn2Mo3O8.

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Theory of partial quantum disorder in the stuffed honeycomb Heisenberg antiferromagnet

Cited by 14 publications

References 42 publications

Co-existence of short- and long-range magnetic order in LaCo$_2$P$_2$

Co-existence of short- and long-range magnetic order in LaCo$_2$P$_2$

Magnetism and ion diffusion in honeycomb layered oxide $${\hbox {K}_2\hbox {Ni}_2\hbox {TeO}_6}$$

Symmetric spin liquids on the stuffed honeycomb lattice

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