Electron spin resonance in a model<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:math>chain antiferromagnet with a uniform Dzyaloshinskii-Moriya interaction

Смирнов, А. И.; Soldatov, T. A.; Povarov, K. Yu.; Hälg, M.; Lorenz, W. E. A.; Zheludev, A.

doi:10.1103/physrevb.92.134417

Cited by 23 publications

(23 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…which is an extremely information-rich quantity, and is accessible through inelastic neutron scattering [15], ESR [16,17], and RIXS [18]. The fractionalization of triplet excitations into pairs of spinons is a fundamental aspect of a QSL, and is expected to manifest in X ± as twoparticle continuum spectral weight [2,19,20], a surprising feature which appears more characteristic of a weakly correlated metal than a strongly correlated Mott insulator.…”

mentioning

confidence: 99%

Collective spinon spin wave in a magnetized U(1) spin liquid

Starykh

2020

Phys. Rev. B

View full text Add to dashboard Cite

We study the transverse dynamical spin susceptibility of the two dimensional U(1) spinon Fermi surface spin liquid in a small applied Zeeman field. We show that both short-range interactions, present in a generic Fermi liquid, as well as gauge fluctuations, characteristic of the U(1) spin liquid, qualitatively change the result based on the frequently assumed non-interacting spinon approximation. The short-range part of the interaction leads to a new collective mode: a "spinon spin wave" which splits off from the two-spinon continuum at small momentum and disperses downward. Gauge fluctuations renormalize the susceptibility, providing non-zero power law weight in the region outside the spinon continuum and giving the spin wave a finite lifetime, which scales as momentum squared. We also study the effect of Dzyaloshinskii-Moriya anisotropy on the zero momentum susceptibility, which is measured in electron spin resonance (ESR), and obtain a resonance linewidth linear in temperature and varying as B 2/3 with magnetic field B at low temperature. Our results form the basis for a theory of inelastic neutrons scattering, ESR, and resonant inelastic x-ray scattering (RIXS) studies of this quantum spin liquid state.

show abstract

mentioning

confidence: 99%

Collective spinon spin wave in a magnetized U(1) spin liquid

Starykh

2020

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…We have studied effect of weak exchange J between antiferromagnetic Heisenberg spin-1/2 chains on the phase diagrams of quasi-one-dimensional materials K 2 CuSO 4 Cl 2 and K 2 CuSO 4 Br 2 [1,2], subject to the uniform but staggered between chains Dzyaloshinskii-Moriya (DM) interaction and external magnetic field. With the help of chain mean field calculation, J can be determined quantitatively, and our results, denoted by J , are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…Despite close structural similarity, the two materials are characterized by different h − T phase diagrams, as has been established by experiments in Prof. Zheludev's group in ETH [1][2][3]. That difference is attributed to the different D/J ratio -according to Ref.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

DM-induced frustration of the weakly coupled Heisenberg chains

Jin

Starykh²

2017

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Abstract. We present theoretical procedure for estimating interchain exchange coupling J between antiferromagnetic spin-1/2 Heisenberg chains with frustration due to DzyaloshinskiiMoriya (DM) interaction characterized by DM vectors Dy which are uniform within each chain y, but staggered between adjacent chains, Dy ∼ (−1) y D. Under a magnetic field h D we obtain a field-temperature phase diagram which favorably agrees with the one experimentally observed. We then apply chain mean-field (CMF) technique to calculate interchain exchange J from the critical field hc at which the transition between the collinear spin-density wave and the cone states takes place. The CMF calculations are found to provide good physical description of the experimental measurements for the wide range of D/J . IntroductionMany experimental realizations of Heisenberg spin chain materials have become available over recent years. Here we present comparative analysis of two new interesting materials -K 2 CuSO 4 Cl 2 and K 2 CuSO 4 Br 2 [1, 2] -which represent an interesting and novel case of Heisenberg spin chains with uniform Dzyaloshinskii-Moriya (DM) interactions.Both materials are believed to be described by the Hamiltonian (1) below and are characterized by a different set of parameters (J, D, J ), where J is the dominant intra-chain exchange, D is the DM interaction strength and J is the interchain spin exchange. Despite close structural similarity, the two materials are characterized by different h − T phase diagrams, as has been established by experiments in Prof. Zheludev's group in ETH [1][2][3]. That difference is attributed to the different D/J ratio -according to Ref.[1] DM interaction is relatively weak in K 2 CuSO 4 Cl 2 , so that D/J ∼ 1, while K 2 CuSO 4 Br 2 can be characterized as a strong DM material with D/J ∼ 10.As we describe below and show in more details elsewhere [4], large D/J ratio places Brbased material into a novel category of materials where interchain interaction between spins from adjacent chains is strongly frustrated by the uniform in-chain, but staggered between chains, DM interaction. This unique geometry of DM interactions makes K 2 CuSO 4 Br 2 somewhat similar to the honeycomb iridates family Li 2 IrO 3 an incommensurate magnetic order of which is characterized by unusual counter-rotating spirals on neighboring sublattices [5]. This kind of frustration requires theoretical re-evaluation of the kind and mechanism of the eventual two-(or, three-) dimensional magnetic order that develops in the system at sufficiently low temperature. Our work provides such an analysis.

show abstract

“…Individual spin chains with uniform 12,13,16,17 and staggered 18 DM interactions respond differently to the magnetic field. In the latter case it leads to the opening of significant spin gap 19 while in the former the (much smaller) gap opens up only in the h ⊥ D geometry 16,17 .…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of weakly coupled Heisenberg spin chains subject to a uniform Dzyaloshinskii-Moriya interaction

Jin

Starykh²

2017

Phys. Rev. B

View full text Add to dashboard Cite

Motivated by recent experiments on spin chain materials K2CuSO4Cl2 and K2CuSO4Br2, we theoretically investigate the problem of weakly coupled spin chains (chain exchange J, interchain J ) subject to a staggered between chains, but uniform within a given chain, Dzyaloshinskii-Moriya (DM) interaction of magnitude D. In the experimentally relevant limit J D J of strong DM interaction the spins on the neighboring chains are forced to rotate in opposite directions, effectively resulting in a cancelation of the interchain interaction between components of spins in the plane normal to the vector D. This has the effect of promoting two-dimensional collinear spin density wave (SDW) state, which preserves U(1) symmetry of rotations about the D-axis. We also investigate response of this interesting system to an external magnetic field h and obtain the h − D phase diagrams for the two important configurations, h D and h ⊥ D.

show abstract

Electron spin resonance in a modelS=12chain antiferromagnet with a uniform Dzyaloshinskii-Moriya interaction

Cited by 23 publications

References 17 publications

Collective spinon spin wave in a magnetized U(1) spin liquid

Collective spinon spin wave in a magnetized U(1) spin liquid

DM-induced frustration of the weakly coupled Heisenberg chains

Phase diagram of weakly coupled Heisenberg spin chains subject to a uniform Dzyaloshinskii-Moriya interaction

Contact Info

Product

Resources

About