Extending MIEZE spectroscopy towards thermal wavelengths.

IF 6.1 3区材料科学 Q1 Biochemistry, Genetics and Molecular Biology

Journal of Applied Crystallography Pub Date : 2022-12-01 DOI:10.1107/S1600576722009505

Johanna K Jochum, Christian Franz, Thomas Keller, Christian Pfleiderer

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Abstract

A modulation of intensity with zero effort (MIEZE) setup is proposed for high-resolution neutron spectroscopy at momentum transfers up to 3 Å^-1, energy transfers up to 20 meV and an energy resolution in the microelectronvolt range using both thermal and cold neutrons. MIEZE has two prominent advantages compared with classical neutron spin echo. The first is the possibility to investigate spin-depolarizing samples or samples in strong magnetic fields without loss of signal amplitude and intensity. This allows for the study of spin fluctuations in ferromagnets, and facilitates the study of samples with strong spin-incoherent scattering. The second advantage is that multi-analyzer setups can be implemented with comparatively little effort. The use of thermal neutrons increases the range of validity of the spin-echo approximation towards shorter spin-echo times. In turn, the thermal MIEZE option for greater ranges (TIGER) closes the gap between classical neutron spin-echo spectroscopy and conventional high-resolution neutron spectroscopy techniques such as triple-axis, time-of-flight and back-scattering. To illustrate the feasibility of TIGER, this paper presents the details of its implementation at the RESEDA beamline at FRM II by means of an additional velocity selector, polarizer and analyzer.

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将MIEZE光谱扩展到热波长。

提出了一种零努力强度调制(MIEZE)装置，用于高分辨率中子能谱，动量转移高达3 Å-1，能量转移高达20 meV，能量分辨率在微电子伏范围内，使用热中子和冷中子。与经典中子自旋回波相比，MIEZE有两个突出的优点。首先是研究自旋去极化样品或在强磁场中样品而不损失信号幅度和强度的可能性。这使得研究铁磁体中的自旋涨落成为可能，并有利于研究具有强自旋非相干散射的样品。第二个优点是，多分析仪设置可以实现相对较少的努力。热中子的使用增加了自旋回波近似的有效性范围，使自旋回波时间更短。反过来，更大范围的热MIEZE选项(TIGER)缩小了经典中子自旋回波光谱和传统高分辨率中子光谱技术(如三轴、飞行时间和反向散射)之间的差距。为了说明TIGER的可行性，本文介绍了其在FRM II的RESEDA波束线上通过额外的速度选择器、偏振器和分析仪实现的细节。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Crystallography 化学-晶体学

CiteScore

10.00

自引率

3.30%

发文量

178

审稿时长

4.7 months

期刊介绍： Many research topics in condensed matter research, materials science and the life sciences make use of crystallographic methods to study crystalline and non-crystalline matter with neutrons, X-rays and electrons. Articles published in the Journal of Applied Crystallography focus on these methods and their use in identifying structural and diffusion-controlled phase transformations, structure-property relationships, structural changes of defects, interfaces and surfaces, etc. Developments of instrumentation and crystallographic apparatus, theory and interpretation, numerical analysis and other related subjects are also covered. The journal is the primary place where crystallographic computer program information is published.

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