Spin Liquid State in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:math>Triangular Lattice<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Ba</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>CuSb</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>9</mml:mn></mml:msub></mml:math>

Zhou, H. D.; Choi, Eun Sang; Li, G.; Balicas, Luis; Wiebe, C. R.; Qiu, Yiming; Copley, J. R. D.; Gardner, J. S.

doi:10.1103/physrevlett.106.147204

Cited by 146 publications

(156 citation statements)

References 21 publications

Supporting

Mentioning

137

Contrasting

Order By: Relevance

“…In contrast to earlier experiments on powder samples, 10 the new experiments on single crystals indicated that the Cu 2+ -ions on the triangular lattice may form dipolar molecules with the Sb 5+ -ions and can move out of plane. Strong disorder due to Jahn-Teller distortions or fluctuations of these Ising dipoles may play a key role in the absence of ordering in the Cu-compound.…”

Section: Discussioncontrasting

confidence: 94%

“…The physical properties of the d+id QSL state seem to be consistent with the recent experiment on Ba 3 NiSb 2 O 9 . 10 While the d+id QSL scenario we investigate in this paper has many attractive and novel features, it remains unclear if the microscopic parameters required to stabilize such a phase are realized in Ba 3 NiSb 2 O 9 . From the crystal structure proposed in [11], it seems more likely that the nearest-neighbor antiferromagnetic exchange energy J is the dominant microscopic parameter.…”

Section: Discussionmentioning

confidence: 97%

“…[4][5][6] So far, several experiments found indication of spin liquid behavior in a number of geometrically frustrated two-dimensional spin-1/2 antiferromagnets. [7][8][9][10] Spin systems with higher values of spin, however, usually show a strong tendency towards long-range ordering and lattice-symmetry breaking at low temperature.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Paired chiral spin liquid with a Fermi surface inS=1model on the triangular lattice

et al. 2012

View full text Add to dashboard Cite

Motivated by recent experiments on Ba3NiSb2O9, we investigate possible quantum spin liquid ground states for spin S = 1 Heisenberg models on the triangular lattice. We use Variational Monte Carlo techniques to calculate the energies of microscopic spin liquid wave functions where spin is represented by three flavors of fermionic spinon operators. These energies are compared with the energies of various competing three-sublattice ordered states. Our approach shows that the antiferromagnetic Heisenberg model with biquadratic term and single-ion anisotropy does not have a low-temperature spin liquid phase. However, for an SU (3)-invariant model with sufficiently strong ring-exchange terms, we find a paired chiral quantum spin liquid with a Fermi surface of deconfined spinons that is stable against all types of ordering patterns we considered. We discuss the physics of this exotic spin liquid state in relation with the recent experiment and suggest new ways to test this scenario.

show abstract

Section: Discussioncontrasting

confidence: 94%

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Paired chiral spin liquid with a Fermi surface inS=1model on the triangular lattice

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Recently, a number of experiments have identified a handful of materials as candidate spin liquids [4][5][6][7][8][9][10][11][12][13][14]. Both the organic charge transfer salts κ-(BEDT-TTF) 2 Cu 2 (CN) 3 (Refs.…”

Section: Introductionmentioning

confidence: 99%

“…However, other members of the organic charge transfer salt families κ-(BEDT-TTF) 2 X and Y [Pd(dmit) 2 ] 2 display long-range magnetic order, for example, X = Cu[N(CN) 2 ]Cl or Cu[N(CN) 2 ]Br (for deuterated BEDT-TTF) and Y = Me 4 P, Me 4 As, EtMe 3 As, Et 2 Me 2 P, Et 2 Me 2 As, and Me 4 Sb [3,8,11]. Additionally, the inorganic materials Cs 2 CuCl 4 [12], Ba 3 CoSb 2 O 9 [13], and Ba 3 CuSb 2 O 9 [14] have also been suggested to be spin-liquid candidates.…”

Section: Introductionmentioning

confidence: 99%

Spin-liquid phase due to competing classical orders in the semiclassical theory of the Heisenberg model with ring exchange on an anisotropic triangular lattice

2014

View full text Add to dashboard Cite

We investigate the effect of ring exchange on the ground-state properties and magnetic excitations of the S = 1/2 Heisenberg model on the anisotropic triangular lattice with ring exchange at T = 0 using linear spin-wave theory. Classically, we find stable Néel, spiral and collinear magnetically ordered phases. Upon including quantum fluctuations to the model, linear spin-wave theory shows that ring exchange induces a large quantum disordered region in the phase diagram, completely wiping out the classically stable collinear phase. Analysis of the spin-wave spectra for each of these three models demonstrates that the large spin-liquid phase observed in the full model is a direct manifestation of competing classical orders. To understand the origin of these competing phases, we introduce models where either the four spin contributions from ring exchange, or the renormalization of the Heisenberg terms due to ring exchange are neglected. We find that these two terms favor rather different physics.

show abstract

A new high pressure form of Ba3NiSb2O9

Klein

Darie

Lepoittevin

et al. 2016

European Microscopy Congress 2016: Proceedings

View full text Add to dashboard Cite

Quantum spin liquids (QSL) are an interesting state of matter and have inspired a great number of investigations into materials showing triangular nets of magnetic ions. In this work we present evidence that one of the targeted phases has indeed a triangular order of Ni ions, but only on a range of about 10 nm. The QSL state was proposed as the ground state for a system of spins on a triangular lattice that interact with their nearest neighbors via an antiferromagnetic interaction. Recently, candidates from the family of 6H‐perovskites Ba 3 MSb 2 O 9 (M= divalent transition metal) have retained attention as QSL materials. The case of Ba 3 NiSb 2 O 9 seems particularly interesting since it could represent an experimental proof of a QSL with spin S = 1. Three different structure types were reported for this compound. All of them are built up by the stacking along the c axis of layers made of either NiO 6 or SbO 6 octahedra and differ by the way layers are stacked via either corner or face sharing of the octahedra. We focus here on the 6H‐B form of Ba 3 NiSb 2 O 9 which can be obtained by applying a High Pressure ‐ High Temperature (HP‐HT) treatment in the range 3 to 6 GPa at 600°C. This compound was reported to present no magnetic order down to 0.35 K, suggesting that it could be an experimental realization of a gapless QSL. In order to investigate this behavior by both nuclear magnetic resonance (NMR) and muon spin resonance (µSR) we synthesized this phase in HP‐HT conditions. X‐ray powder diffraction on a laboratory source (Bruker D8) and neutron powder diffraction on the D1B beamline of the ILL (Grenoble, France) have been performed. The refinement of the structure using these data showed disorder of Ni and Sb atoms on the sites of the triangular lattice. In that case, the absence of magnetic ordering could be simply related to the structural disorder of the magnetic cation framework, in which the triangular planes are not preserved. For a correct interpretation of physical properties of the samples, it is thus mandatory to clarify the nature of the disorder and confirm (or not) the existence of Ni triangular planes in the structure. Therefore, we have undertaken a thorough investigation of the structural properties of 6H‐B Ba 3 NiSb 2 O 9 using precession electron diffraction and Z‐contrast imaging. STEM‐HAADF Z‐contrast imaging (figure 1a) shows rows of bright contrasts that can be linked to the structural model of Ba 3 NiSb 2 O 9 (figure 1b). Figures 1c and 1d show the intensity profiles in the green and pink boxed areas, respectively, with theoretical intensities based on the atomic numbers superimposed. As expected, the contrast corresponding to the Ba atoms (green) shows the highest intensities. The intensity in the center of the profiles corresponds well to a Sb atom (yellow). However, on the two remaining positions, where the 6H‐B structure has either a Sb or a Ni atom (blue) the expected intensities differ from the observed ones. The observed intensities on the Ni/Sb sites can be interpreted as Sb and Ni being both present in the atomic columns. Precession electron diffraction on a thin particle showed that the symmetry of the crystal isn't compatible with the P6 3 mc space group proposed for 6H‐B. The [010] zone axis (figure 2a) shows no mirror symmetry perpendicular to the c* direction and the existence of the 003 reflection. This is incompatible with a 6‐fold axis or a c glide plane in the crystal. The correct space group must therefore be trigonal. Figure 2b shows a structure compatible with all our observations. Here the Ni and Sb atoms are on distinct sites, different from those reported for the 6H‐A and 6H‐B forms, thus breaking the mirror symmetry perpendicular to c and the c glide plane. In conclusion, Ni‐triangle planes can effectively be present in this structure but only in domains of up to 10 nm in size. At the larger scale seen by X‐rays and neutrons, typically several 10s nm we observe an average of several domains and the average symmetry becomes hexagonal with a statistical Ni/Sb disorder on the cation sites of the face sharing octahedra.

show abstract

Spin Liquid State in theS=1/2Triangular LatticeBa3CuSb2O9

Cited by 146 publications

References 21 publications

Paired chiral spin liquid with a Fermi surface inS=1model on the triangular lattice

Paired chiral spin liquid with a Fermi surface inS=1model on the triangular lattice

Spin-liquid phase due to competing classical orders in the semiclassical theory of the Heisenberg model with ring exchange on an anisotropic triangular lattice

A new high pressure form of Ba3NiSb2O9

Contact Info

Product

Resources

About