Spin chirality and polarised neutron scattering

Plakhty, V.P.; Maleyev, S. V.; Kulda, J.; Visser, Erwin; Wosnitza, J.; Moskvin, E. V.; Brückel, Thomas; Kremer, R. K.

doi:10.1016/s0921-4526(00)00846-2

Cited by 9 publications

(10 citation statements)

References 25 publications

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“…5͒ and CsNiCl 3 ͑S =1͒. 6 The values of ␤ c = 0.44͑2͒ and ␥ c = 0.84͑7͒ obtained for CsMnBr 3 and the sum ␤ c + ␥ c = 1.24͑7͒ obtained for CsNiCl 3 are in a good agreement with the theory.…”

Section: Introductionsupporting

confidence: 76%

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Chiral fluctuations in triangular antiferromagnets atT⪡TN

Syromyatnikov

2005

Phys. Rev. B

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Chiral fluctuations in triangular antiferromagnets ͑TAFs͒ at T Ӷ T N are studied theoretically. The case of a ferromagnetic interaction along the c axis ͑which is directed perpendicular to the plane of the lattice͒, Dzyaloshinskii-Moriya interaction D ʈ c and a weak magnetic field H ʈ c, is considered in detail. Previously, this model has been proposed to describe quantum TAF CsCuCl 3 . Expressions for dynamical chirality ͑DC͒ are derived within the linear spin-wave approximation. In contrast to nonfrustrated antiferromagnets, DC is found to be nonzero even at D , H = 0 in a one-domain sample. We argue that this unusual behavior stems from the fact that a ground state of XY and Heisenberg TAFs is characterized by an axial vector along which DC is directed.

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Section: Introductionsupporting

confidence: 76%

“…Spin chirality has attracted a lot of attention during last two decades (see Refs. 1,2,3,4,5,6,7 and references therein). The main subjects of investigation were helical magnets and triangular antiferromagnets (TAFs).…”

Section: Introductionmentioning

confidence: 99%

Chiral fluctuations in triangular antiferromagnets atT⪡TN

Syromyatnikov

2005

Phys. Rev. B

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“…21 As seen from the table the results are not very sensitive to the corrections. Nevertheless we believe that the most reliable result is represented in line ͑c͒.…”

Section: ͑4͒mentioning

confidence: 73%

“…Furthermore, the high value of ␤ c should not be due to torsion since it is consistent with the high c ϭ␤ c ϩ␥ c obtained for the native crystal without deformation. 21 There are neither ␤ nor ␤ c calculated values for the chiral universality class of the XY helimagnets such as Ho, apparently due to the difficulties in including the long-range oscillating Ruderman-Kittel-Kasuya-Yosida ͑RKKY͒ interaction. Therefore the critical exponents are usually compared to those obtained for the XY TLA's.…”

Section: ͑4͒mentioning

confidence: 99%

Chiral criticality in helimagnet Ho studied by polarized neutron scattering

et al. 2001

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The critical exponents for the average chirality, ␤ c ϭ0.90(3), and the chiral susceptibility, ␥ c ϭ0.68(6), are determined for the spin-ordering transition in helimagnet Ho. The ␤ c is extraordinarily large and twice higher than the predicted value for the chiral universality class, while the ␥ c is in agreement with this scenario. The staggered magnetization critical exponent is determined to be ␤ϭ0.38͑1͒. The difference ␤ c Ϫ2 ␤ ϭ0.137(36) suggests that chirality is a component of the order parameter independent of the staggered magnetization. The chiral-ordering transition and the Néel temperature coincide with a relative precision of 10 Ϫ4 .The order parameter of helically polarized magnets ͓stacked-triangular lattice antiferromagnets ͑TLA͒, helimagnets, such as rare-earth metals, etc.͔ includes, along with the ordinary spin variable S R , the spin chiralitywhere Q is the scattering vector, Q , Ĉ are unit vectors, k is the satellite wave vector of a reflection with the reciprocal lattice vector b m , and n L , n R are the populations of the leftand right-handed chiral domains, respectively.

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“…Theoretical and experimental investigations of the chiral universality class of helimagnets in a strongly interacting spin system like MnSi would help to better understand the chiral criticality in 3- studies of critical dynamics in helimagnets like Ho and Dy show that the critical exponents were not consistent with the universality class expected for 3-d isotropic ferromagnets [5].…”

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confidence: 99%