Vortex dynamics and frustration in two-dimensional triangular chromium lattices

Hemmida, M.; Nidda, H.-A. Krug von; Büttgen, N.; Loidl, A.; Alexander, L. K.; Nath, R.; Mahajan, A. V.; Berger, Reinhard; Cava, R. J.; Singh, Yogesh; Johnston, D. C.

doi:10.1103/physrevb.80.054406

Cited by 42 publications

(48 citation statements)

References 34 publications

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“…For this situation Bramwell and Holdsworth calculated that T KT should be approximately 85 % of T N [12]. For the b-parameter experimental values reach from 0.9 (NMR, [13]) to 4.1 (ESR, [10]) which is in agreement with theoretical estimations [11,14].…”

Section: Methodssupporting

confidence: 80%

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Field Dependence of XY-Behavior in Frustrated S = 1/2 Square Lattices

Förster

Garcia

Ponomaryov³

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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The spin dynamics of the layered square-lattice vanadates Pb 2 VO(PO 4 ) 2 and SrZnVO(PO 4 ) 2 is investigated by electron spin resonance (ESR) at various magnetic fields up to 5.7 T and at temperatures above magnetic ordering. The linewidth divergence towards low temperatures is best described by spin fluctuations based on a planar XY type of exchange. Therefore, for both of these frustrated square lattice systems XY-inherent spin topological fluctuations seem to be relevant for the ESR-probed spin dynamics.

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Section: Methodssupporting

confidence: 80%

“…The movement of the vortices in the XY-model leads to a spin relaxation which depends on the inverse correlation length of the vortices. Neglecting a temperature dependence of the vortex velocity one finds [9,10]:…”

Section: Methodsmentioning

confidence: 99%

Field Dependence of XY-Behavior in Frustrated S = 1/2 Square Lattices

Förster

Garcia

Ponomaryov³

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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“…In recent experiments on the triangular-lattice Heisenberg AFs S=3/2 NaCrO 2 , [8][9][10][11] S=1 NiGa 2 S 4 12-18) and S=1/2 organic compounds, κ-(BEDT-TTF) 2 Cu 2 (CN) 3 19-21) or EtMe 3 Sb[Pd(dmit) 2 ] 2 , 22, 23) a spin-liquid like behavior without the standard magnetic long-range order was observed, while all of these compounds exhibit a weak but clear transition-like anomaly at a finite temperature. As a possible explanation of the observed experimental behavior, ref.…”

Section: Introductionmentioning

confidence: 99%

Signature of a Z₂ Vortex in the Dynamical Correlations of the Triangular-Lattice Heisenberg Antiferromagnet

Okubo

Kawamura

2010

J. Phys. Soc. Jpn.

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Dynamical properties of the classical Heisenberg antiferromagnet on the triangular lattice are investigated by means of a spin-dynamics simulation and an analytical calculation. While the model was suggested to exhibit a topological transition driven by the Z2-vortex bindingunbinding, weakness of the associated thermodynamic singularity has made it difficult to observe the evidence of the Z2 vortex experimentally so far, only some indirect support. Here, we show that the signature of the Z2-vortex excitation and the vortex-induced topological transition can be captured from the dynamical spin correlations. In particular, the dynamical spin structure factor exhibits a characteristic central peak around the Z2-vortex transition, and this central peak will be a fingerprint of the Z2-vortex excitation.

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“…The intralayer exchange interaction (J) dominates over weak interlayer interaction (J ′ ) mediated through the long Cr−O−Li−O−Cr superexchange path. 9 The dominant 2D intralayer interaction effectively leads to the AFM transition at T N ≈62 K. [10][11][12][13][14] The Cr atoms surrounded by oxygen octahedra displayed in Fig. 1(d) exist in Cr 3+ state with S = 3/2.…”

mentioning

confidence: 99%

Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li0.99Cu0.01CrO
Dey
¹
,
Karmakar
²
,
Majumdar
³

et al. 2013
Phys. Rev. B
19
4
18
1
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This work reports an experimental study on the temperature dependence of the structural parameters of LiCrO2 (LCO) and Li0.99Cu0.01CrO2 (LCCO) by using synchrotron x-ray diffraction technique. A significant magnetoelastic coupling is revealed by the anomalies observed in lattice parameters at the magnetic and electric phase transitions, apparent as step-like features in both Cr−O, Li−O bond lengths as well as O−Cr−O bond angles. Magnetic, dielectric, and electric polarization measurements reveal the antiferromagnetic and antiferroelectric (AFE) ordering at 119 and 61 K, respectively for LCCO. Interestingly, a fairly large uncompensated spontaneous electric polarization appears for LCCO in contrast to nearly compensated polarization value for LCO below the AFE ordering. This is correlated to the structurally driven enhancement (∼ 4 times) of the interlayer Cr−O−Li/Cu−O−Cr superexchange interaction for LCCO. We argue that strong magnetoelastic coupling holds the key for the observed uncompensated spontaneous electric polarization in LCCO. PACS numbers: 75.80.+q, Coupling between structural and magnetic functionalities in strongly correlated systems, the so called magnetoelastic coupling, is one of the foremost topics in the physics of materials that are fundamentally and technologically promising. 1 This phenomenon, a subset of the recent terminology of multiferroicity, 2-5 attracts renewed attention after the discovery of colossal magnetoresistance. 6 This coupling usually appears as a structural change at the magnetic transition or change in magnetic functionalities at the structural transition. In such a backdrop of versatile abundance of scientific studies, 2-5 the evidence of magnetoelasticity with isostructural transition is quite rare, while those inheriting large atomic displacement are even rarer. 7,8 In the following study we observe a fairly large oxygen displacement at an isostructural transition, giving rise to ∼ 0.02 A step-like increase in Cr−O bond length as obtained from the x-ray diffraction studies using high-flux synchrotron source in a two-dimensional (2D) triangular lattice antiferromagnet (AFM), Li 0.99 Cu 0.01 CrO 2 (LCCO). Most interestingly, this displacement enhances remarkably (∼ 10 times) due to minimal Cu doping in LiCrO 2 (LCO).The ordered rock salt structure with R3m space group of LCO attracts significant attention for the unique 2D triangular lattice structure. As evident in Fig. 1(a) the layers consisting of Cr−O−Li−O−Cr atoms are stacked along c-axis. Notably, the intralayer Cr ions form typical 2D triangular lattice as displayed in Fig. 1(b). The intralayer exchange interaction (J) dominates over weak interlayer interaction (J ′ ) mediated through the long Cr−O−Li−O−Cr superexchange path. 9 The dominant 2D intralayer interaction effectively leads to the AFM transition at T N ≈62 K. 10-14 The Cr atoms surrounded by oxygen octahedra displayed in Fig. 1(d) exist in Cr 3+ state with S = 3/2. The AFM ordering below T N , however, produces a ground state characterized by strong spin ...

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Vortex dynamics and frustration in two-dimensional triangular chromium lattices

Cited by 42 publications

References 34 publications

Field Dependence of XY-Behavior in Frustrated S = 1/2 Square Lattices

Field Dependence of XY-Behavior in Frustrated S = 1/2 Square Lattices

Signature of a Z₂ Vortex in the Dynamical Correlations of the Triangular-Lattice Heisenberg Antiferromagnet

Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li0.99Cu0.01CrO
Dey
¹
,
Karmakar
²
,
Majumdar
³

et al. 2013
Phys. Rev. B
19
4
18
1
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Vortex dynamics and frustration in two-dimensional triangular chromium lattices

Cited by 42 publications

References 34 publications

Field Dependence of XY-Behavior in Frustrated S = 1/2 Square Lattices

Field Dependence of XY-Behavior in Frustrated S = 1/2 Square Lattices

Signature of a Z2 Vortex in the Dynamical Correlations of the Triangular-Lattice Heisenberg Antiferromagnet

Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li0.99Cu0.01CrODey1, Karmakar2, Majumdar3 et al. 2013Phys. Rev. B194181View full textAdd to dashboardCite

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Signature of a Z₂ Vortex in the Dynamical Correlations of the Triangular-Lattice Heisenberg Antiferromagnet

Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li0.99Cu0.01CrO
Dey
¹
,
Karmakar
²
,
Majumdar
³

et al. 2013
Phys. Rev. B
19
4
18
1
View full text Add to dashboard Cite