Helical magnetic structure and hyperfine interactions in FeP studied by 57Fe Mössbauer spectroscopy and 31P NMR

Sobolev, A. V.; Presniakov, Igor A.; Gippius, A. A.; Chernyavskii, Ivan V.; Schaedler, Martina; Buettgen, Norbert; Ibragimov, Sergey A.; Morozov, Igor; Shevelkov, Аndrei V.

doi:10.1016/j.jallcom.2016.03.123

Cited by 22 publications

(27 citation statements)

References 29 publications

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“…Since Ŝ is proportional to the ion magnetic moment, so is B hf . An example of how to handle the anisotropic magnetic hyperfine interaction can be found in Reference [40] where iron phosphide (FeP) having an orthorhombic structure with the same space group as LiFePO 4 was investigated. B hf values from Table 3 could be used to estimate the tensor A (supposed for simplicity to be diagonal in the coordinate system with axes parallel to orthorhomic a, b, and c translation vectors) considering that Fe ions are in the high spin state S = 2 regardless of the magnetic moment orientation.…”

Section: Theoretical Exploration Of Magnetism and Hyperfine Interactionsmentioning

confidence: 99%

Mössbauer Spectroscopy of Triphylite (LiFePO4) at Low Temperatures

et al. 2019

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Low temperature magnetic ordering in the LiFePO 4 compound is investigated experimentally using Mössbauer spectroscopy and theoretically via first principles calculations. The evaluation of experiment carried out on a powder sample is compatible with an antiferromagnetic order of Fe ion magnetic moments. When an external magnetic field is applied, Fe magnetic moments start to deviate slightly from the [010] easy magnetization direction. These findings are confirmed by means of first principles calculations, which also suggest the magnitude of single ion magnetic anisotropy and orbital and spin-dipolar contributions to the magnetic hyperfine field, which is eventually in a good agreement with the experiment. Diffraction and magnetic measurements complement the study.

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Section: Theoretical Exploration Of Magnetism and Hyperfine Interactionsmentioning

confidence: 99%

Mössbauer Spectroscopy of Triphylite (LiFePO4) at Low Temperatures

et al. 2019

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“…Первые результаты измерения спектра ЯМР 31 P в FeP во внешнем поле приведены в работе [6]. B−B L = −0.4 T и B−B L = 0.6 T. Спектр ЯМР 31 P на частоте 60 MHz (B L = 3.48 T), измеренный ранее [6], имеет трапецеидальную форму, близкую к типичным для спектров ЯМР поликристаллических образцов [6].…”

Section: спектр ямр 31 P в Fep во внешнем полеunclassified

“…B−B L = −0.4 T и B−B L = 0.6 T. Спектр ЯМР 31 P на частоте 60 MHz (B L = 3.48 T), измеренный ранее [6], имеет трапецеидальную форму, близкую к типичным для спектров ЯМР поликристаллических образцов [6]. Сигнал ЯМР в нулевом поле отсутствует, интенсивность эха распределена в широком интервале между симметричными пределами B−B L = −0.9 T и B−B L = +0.9 T, тем самым указывая на величину 0.9 T как на максимальное значение наведенного магнитного поля на ядрах 31 P. Форма сигнала ЯМР вполне удовлетворительно описывалась в рамках простой теории формы линии ЯМР в порошкообразном образце в предположении единой величины локального поля для всех ядер [6,9] F(H) ∝ Дальнейшее увеличение частоты и соответствующего внешнего магнитного поля приводит к резкой трансформации трапецеидального спектра ЯМР 31 P в FeP с появлением вместо правого и левого плеча прежней трапеции ярко выраженных пиков с широким максимумом между ними. Так, на частоте 120 MHz (B L = 6.963 T) два боковых пика преобразуются в характерные асимметричные краевые пики, а широкая центральная часть имеет относительно небольшую амплитуду (см.…”

Section: спектр ямр 31 P в Fep во внешнем полеunclassified

“…1) однозначно указывает на квазинепрерывное распределение локального магнитного поля на ядрах 31 P, типичное для полей, наводимых анизотропными ангармоническими магнитными спиралями. Так, спектры эффекта Мессбауэра 57 Fe в FeP хорошо описывались в предположении существования ангармонической магнитной спирали в Fe-подрешетке, распространяющейся вдоль c-оси [6], для которой…”

Section: Introductionunclassified

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ЯМР-исследование магнитной структуры и сверхтонких взаимодействий в бинарном гелимагнетике FeP

Гиппиус¹,

Журенко²,

Büttgen

et al. 2019

Физика Твердого Тела

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An NMR analysis of ^31P nuclei in metallic iron phosphide FeP has been performed both in a zero field and by sweeping the external magnetic field at several fixed frequencies with the aim of revealing and investigating the transformation of the magnetic helical structure of FeP. The NMR lineshape gradually changes with an increase in the field strength from trapezoidal (in weak fields) to pronounced asymmetric with two peaks (in strong fields). The former shape is typical of NMR spectra of powder samples under an applied magnetic field, while the latter is characteristic of NMR spectra of nonmagnetic atoms in single-crystalline helimagnetics. The observed transformation of the FeP NMR spectrum evidences in favor of the spin-reorientation transition of a spin-flop type in FeP at strong external fields.

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“…The Ce 3+ contribution makes estimation of T N (Fe) from the magnetic data difficult, though we observe a sharp maximum around 80 K in dχT /dT and a broader maximum around 145 K. The overall behavior is consistent with that of the (diamagnetic) La analog β-La 2 O 2 FeSe 2 , which shows non-Curie-Weiss behavior with a broad hump in susceptibility around 91 K which coincides with the loss of magnetic neutron scattering at the Nèel temperature T N . [26], BiFeO 3 [27,28], and AgFeO 2 [29]), iron arsenide superconductors (e.g., doped BaFe 2 As 2 [30,31]), and systems such as Fe x V 3−x S 4 [32], FeP [33], CuFeSe 2 , and CuFeTe 2 [34]. Values of the isomer shift δ and quadrupole splitting E Q , derived by fitting to the paramagnetic spectra (T > 90 K), are presented in Fig.…”

Section: Magnetic Properties Of β-Ce 2 O 2 Fesementioning

confidence: 99%

Crystal structure and magnetic modulation in β−Ce2O2FeSe2

Wang

Ainsworth

Champion

et al. 2017

Phys. Rev. Materials

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Publisher's copyright statement:Reprinted with permission from the American Physical Society: Wang, Chun-Hai, Ainsworth, C. M., Champion, S. D., Stewart, G. A., Worsdale, M. C., Lancaster, T., Blundell, S. J., Brand, Helen E. A. Evans, John S. O. (2017). Crystal structure and magnetic modulation in Ce2O2FeSe2. Physical Review Materials 1(3): 034403 c 2017 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modi ed, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We report a combination of x-ray and neutron diffraction studies, Mössbauer spectroscopy, and muon spin relaxation (μ + SR) measurements to probe the structure and magnetic properties of the semiconducting β-Ce 2 O 2 FeSe 2 oxychalcogenide. We report a structural description in space group P na2 1 which is consistent with diffraction data and second harmonic generation measurements and reveal an order-disorder transition on one Fe site at T OD ≈ 330 K. Susceptibility measurements, Mössbauer, and μ + SR reveal antiferromagnetic ordering below T N = 86 K and more complex short range order above this temperature. 12 K neutron diffraction data reveal a modulated magnetic structure with q = 0.444b N * .

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Helical magnetic structure and hyperfine interactions in FeP studied by 57Fe Mössbauer spectroscopy and 31P NMR

Cited by 22 publications

References 29 publications

Mössbauer Spectroscopy of Triphylite (LiFePO4) at Low Temperatures

Mössbauer Spectroscopy of Triphylite (LiFePO4) at Low Temperatures

ЯМР-исследование магнитной структуры и сверхтонких взаимодействий в бинарном гелимагнетике FeP

Crystal structure and magnetic modulation in β−Ce2O2FeSe2

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