Overscreened Kondo fixed point in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math>spin liquid

Serbyn, Maksym; Senthil, T.; Lee, Patrick A.

doi:10.1103/physrevb.88.024419

Cited by 3 publications

(1 citation statement)

References 86 publications

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“…In such a system the nuclear spins form a Kondo type lattice in which the spin liquid state takes the role of both the mediator of slRKKY interaction and of Kondo type screening. Although a variant of Kondo lattice physics may be possible or a variant of general Kondo physics in a spin liquid may be possible [18][19][20][21][22][23][24][25][26] our focus will be different because in most cases the nuclear spins are much larger than 1/2 and as a result the semi-classical treatment below becomes accurate. To understand the full implications of the slRKKY interactions we will consider the stabilization of nuclear magnetic order as any ordering of the nuclear spins could affect measurements of the spin liquid.…”

Section: Introductionmentioning

confidence: 99%

Spin liquid mediated RKKY interaction

Legg¹,

Braunecker²

2019

Sci Rep

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We propose an RKKY-type interaction that is mediated by a spin liquid. If a spin liquid exists such an interaction could leave a fingerprint by ordering underlying localised moments such as nuclear spins. This interaction has a unique phenomenology that is distinct from the RKKY interaction found in fermionic systems; most notably the lack of a Fermi surface and absence of the requirement for itinerant electrons, since most spin liquids are insulators. We demonstrate that the interaction is predominately shaped by the lattice symmetries of the underlying spin liquid. As a working example we investigate the possible ordering of nuclear spins that interact through an underlying lattice of the two-dimensional spin-1/2 kagome antiferromagnet (KHAF), although the treatment remains general and can be extended to other spin liquids and dimensions. We find that several different nuclear spin orderings minimise the RKKY-type energy induced by the KHAF but are unstable due to a zero-energy flat magnon band in linear spin-wave theory. Despite this we show that a small magnetic field is able to gap out this magnon spectrum resulting in an intricate nuclear magnetism.

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Section: Introductionmentioning

confidence: 99%

Spin liquid mediated RKKY interaction

Legg¹,

Braunecker²

2019

Sci Rep

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Kondo effect and RKKY interaction assisted by magnetic anisotropy in a frustrated magnetic molecular device at zero and finite temperature

Nan

Wang

et al. 2021

Phys. Chem. Chem. Phys.

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Evidence for a spinon Fermi surface in the triangular S=1 quantum spin liquid Ba3NiSb2O9

et al. 2017

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Inelastic neutron scattering is used to study the low-energy magnetic excitations in the spin-1 triangular lattice of the 6H-B phase of Ba3NiSb2O9. We study two powder samples: Ba3NiSb2O9 synthesized under high pressure and Ba2.5Sr0.5NiSb2O9 in which chemical pressure stabilizes the 6H-B structure. The measured excitation spectra show broad gapless and nondispersive continua at characteristic wave vectors. Our data rules out most theoretical scenarios that have previously been proposed for this phase, and we find that it is well described by an exotic quantum spin liquid with three flavors of unpaired fermionic spinons, forming a large spinon Fermi surface. [17]. Strikingly, when T |θ CW |, the compound shows a large linear term in the specific heat, γ = 168 mJ/mol K 2 , and a finite magnetic susceptibility [17]. Such a metallic behavior in this strong Mott insulator suggests the presence of gapless coherent quasiparticles, possibly due to the emergence of a Fermi sea of fractional spinons. Evidence of gapless spin excitations are also found in recent NMR and µSR measurements [18].Several scenarios have been discussed so far to explain the intriguing properties of Ba 3 NiSb 2 O 9 . The S = 1 spin of the Ni 2+ ions can be fractionalized into three [19] or four [20] fermionic spinons, resulting in rather different, but plausible QSL states: A chiral Z 2 QSL with spinon Fermi surface [21,22] or a time-reversal symmetric Z 4 QSL with quadratic spinon bands touching [20] have been proposed. Nematic three-dimensional spin liquids resulting from a bosonic fractionalization of spin have also been put forth [23]. Other proposals include the proximity to a quantum critical point as a consequence of fine-tuned inter-and intralayer exchanges, without the formation of a spin-liquid ground state [24].In this paper, we study powder samples of the 6H-B structure of Ba 3 NiSb 2 O 9 using inelastic neutron scattering (INS) in order to bring clarity to these theoretical proposals. Broad gapless and nondispersive spin excitation continua are observed at three characteristic wave vectors. Strikingly, our wave-vector resolved data rule out most of the previous proposals for the magnetic lowtemperature phase. We find that the INS data is well described by a U(1) quantum spin liquid with three flavors of spinons, forming a large spinon Fermi surface. This exotic spin S = 1 QSL state preserves full spin-rotation and time-reversal symmetry, as well as all symmetries of arXiv:1610.03753v2 [cond-mat.str-el]

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Overscreened Kondo fixed point inS=1spin liquid

Cited by 3 publications

References 86 publications

Spin liquid mediated RKKY interaction

Spin liquid mediated RKKY interaction

Kondo effect and RKKY interaction assisted by magnetic anisotropy in a frustrated magnetic molecular device at zero and finite temperature

Evidence for a spinon Fermi surface in the triangular S=1 quantum spin liquid Ba3NiSb2O9

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