Polarized neutron scattering in magnets

Maleev, S. V.

doi:10.3367/ufnr.0172.200206a.0617

Cited by 27 publications

(5 citation statements)

References 99 publications

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“…Neutron polarization analysis (NPA) [5][6][7][8] provides an unprecedented range of capabilities, both for developing new neutron scattering techniques [9][10][11], and for elastic and inelastic neutron scattering studies of novel magnetic states and excitations. Polarized neutron measurements allow one to identify the directions of magnetic moments and their fluctuations, distinguish between the structural and magnetic scattering features, and separate the magnetic and the non-magnetic background.…”

Section: Introductionmentioning

confidence: 99%

Polarized neutron scattering on HYSPEC: the HYbrid SPECtrometer at SNS

Zaliznyak

Savici

Garlea

et al. 2017

J. Phys.: Conf. Ser.

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We describe some of the first polarized neutron scattering measurements performed at HYSPEC [1-4] spectrometer at the Spallation Neutron Source, Oak Ridge National Laboratory. We discuss details of the instrument setup and the experimental procedures in the mode with full polarization analysis. Examples of polarized neutron diffraction and polarized inelastic neutron data obtained on single crystal samples are presented.

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Section: Introductionmentioning

confidence: 99%

Polarized neutron scattering on HYSPEC: the HYbrid SPECtrometer at SNS

Zaliznyak

Savici

Garlea

et al. 2017

J. Phys.: Conf. Ser.

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“…In small H, the antisymmetric part is proportional to H and, as the Zeeman interaction is a product of H and the total spin ͚S R , the antisymmetric part of the scattering is determined by the three-spin correlation function ͓͑͗S x ϫ S y ͔S z ͒͘. 9,15,16 This chiral part of the neutron scattering is static for helimagnets and dynamic for ferromagnets. Indeed, the transverse components of the spin in ferromagnets ͑S x and S y ͒, saturated in the z direction, are always related to the excitations.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…3 The dynamical chirality is a three-spin correlation function and it may be considered as a result of the scattering of critical fluctuations on the uniform magnetic field. 16 From this point of view it is clear that C͑q͒ is a function of two momenta, namely the momentum of the fluctuation, q, and the momentum of the field, q H = 0. The principle of critical factorization was formulated by Polyakov [12][13][14] and is known as Polyakov-Kadanoff-Wilson operator algebra.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…[12][13][14] The triple-vertex and the three-spin correlation ͑TSC͒ function are objects showing chirality that can be directly studied by means of polarized neutrons. It was shown recently 15,16 that not only static but also dynamic chirality can be investigated by means of polarized neutron scattering using ͑i͒ a special inclined geometry of the applied magnetic field ͑H is inclined to the wave vector q͒ or ͑ii͒ directly by means of triple-axis techniques. 17 It was shown in 18-20 that in the case of ferromagnets ͑in the inclined geometry͒ neutron scattering from the three-spin fluctuations leads to the appearance of an asymmetric contribution to the polarizationdependent cross section.…”

Section: Introductionmentioning

confidence: 99%

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Critical two- and three-spin correlations in EuS: An investigation with polarized neutrons

et al. 2005

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The critical magnetic scattering has been investigated in EuS by means of small-angle scattering with polarized neutrons using an inclined magnetic field geometry, allowing the determination of three-spin correlation functions. Two contributions to the critical magnetic scattering I ⌺ ͑q͒ = I ↑ ͑q͒ + I ↓ ͑q͒ and ⌬I͑q͒ = I ↑ ͑q͒ − I ↓ ͑q͒ were studied for temperatures near T C = 16.52 K. The I ↑ ͑q͒ and I ↓ ͑q͒ are the scattering intensities for the incident neutron beam polarized along ͑↑͒ and opposite ͑↓͒ to the magnetic field. The symmetric contribution, namely I ⌺ ͑q͒, comes from the pair-spin correlation function. The scattering intensity is well described by the Ornstein-Zernike expression I ⌺ ͑q͒ = A͑q 2 + 2 ͒ −1 , where = −1 is the inverse correlation length of the critical fluctuations. The correlation length obeys the scaling law = a 0 − , where = ͑T − T C ͒ / T C is the reduced temperature, a 0 = 0.17 nm, and = 0.68± 0.01. The difference contribution ⌬I͑q͒ is caused by the three-spin chiral dynamical spin fluctuations that represent the asymmetric part of the polarization dependent scattering. The q dependence of ⌬I͑q͒ follows closely 1 / q 2 . ⌬I͑q͒ depends on the temperature as − with = 0.64± 0.05. The exponents as determined by means of the static measurements by and the dynamic measurements ͑using the chirality͒ are in excellent agreement with each other, demonstrating the internal consistency of the theory and the experiment. Therefore, our results confirm the principle of the critical factorization, which is known as Polyakov-Kadanoff-Wilson operator algebra.

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“…Это обусловлено тем, что низкоразмерные решеточные модели на треугольной решетке описывают большой класс реальных физических систем: слоистые магнетики, пленки жидкого гелия, сверхпроводящие пленки, адсорбированныe пленки и др. [4][5][6][7][8][9][10]. Атомы в узлах треугольной решетки отличаются состояниями.…”

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Computer Simulation of Antiferromagnetic Structures Described by the Three-Vertex Antiferromagnetic Potts Model

Abuev¹,

Бабаев²,

Esetov³

2017

Vestn. Dagest. gos. teh. univ., Teh. nauki

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Резюме: Цель. Проведено компьютерное моделирование антиферромагнитных структур описываемых трехвершинной моделью Поттса на треугольной решетке с учетом антиферромагнитных обменных взаимодействий между ближайшими J 1 и вторыми соседями J 2. Основной целью компьютерного моделирования являлось выяснение основного состояния и областей влияний фрустраций на термодинамические и магнитные свойства антиферромагнитных структур описываемых низкоразмерной моделью Поттса. Метод. Компьютерное моделирование проведено на основе метода Монте-Карло. При этом рассматриваемый метод реализуется с применением алгоритма Метрополиса в сочетании с кластерным алгоритмом Вольфа. Компьютерное моделирование проводилось для низкоразмерных систем с периодическими граничными условиями и линейными размерами L=24124. Результат. На основе анализа теплоемкости и энтропии, показано, что в рассматриваемой модели с величинами взаимодействий обменных параметров J 1 <0 и J 2 <0 в интервалах изменений величины 0r<0.2 и 1.0

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Polarized neutron scattering in magnets

Cited by 27 publications

References 99 publications

Polarized neutron scattering on HYSPEC: the HYbrid SPECtrometer at SNS

Polarized neutron scattering on HYSPEC: the HYbrid SPECtrometer at SNS

Critical two- and three-spin correlations in EuS: An investigation with polarized neutrons

Computer Simulation of Antiferromagnetic Structures Described by the Three-Vertex Antiferromagnetic Potts Model

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