X-ray photoelectron spectroscopy of FeP phosphide

Teterin, Yu. A.; Sobolev, A. V.; Presnyakov, I. A.; Maslakov, K. I.; Teterin, A. Yu.; Morozov, Igor; Chernyavskii, I. O.; Иванов, К. Е.; Shevelkov, Аndrei V.

doi:10.1134/s1063776117010174

Cited by 9 publications

(6 citation statements)

References 31 publications

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“…7c is in agreement with the literature reports for FeP powders. 43,44 We note, however, that because some sputter cleaning has been involved in all cases, the exact BEs reported here and in the literature likely correspond to a FeP crystal surface with some degree of amorphization: for example, both BEs and stoichiometry signicantly shied for a model Ni 2 P(0001) single-crystal surface aer it was annealed to recover long-range ordering. 42 The evolution of the Fe : P ratio (based only on the intensities of the phosphide Fe 2p and P 2p components, color-coded red in Fig.…”

Section: Surface Compositionmentioning

confidence: 68%

“…The Fe 2p 3/2 spectrum is simplied to a single component at BE ¼ 707.0 eV, in agreement with BE values previously reported for FeP powder samples. 43,44 The pronounced asymmetry of the Fe 2p 3/2 spectrum in Fig. 7c is typically characteristic of pure metals, however, for FeP the BE and line shape nearly identical to those of Fe metal are well established and have been attributed to the details of the electronic structure of crystalline FeP.…”

Section: Surface Compositionmentioning

confidence: 89%

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Crystallographic facet selective HER catalysis: exemplified in FeP and NiP₂ single crystals

et al. 2020

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Section: Surface Compositionmentioning

confidence: 68%

Section: Surface Compositionmentioning

confidence: 89%

Crystallographic facet selective HER catalysis: exemplified in FeP and NiP₂ single crystals

et al. 2020

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“…This has motivated physicists to a detailed study of the magnetic behavior of the sister compound FeP, in which HMS emerges below TN =120 K [6]. Despite considerable efforts, however, the details of the magnetic structure and mechanism of the HMS formation remain unclear [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…To explain the neutron diffraction data, the authors assumed a HMS with two different magnetic moments of the Fe atoms in the magnetic state despite a unique crystallographic position of Fe. To check this scenario, recently a series of studies on polycrystalline FeP were carried out by means of Mössbauer 57 Fe spectroscopy, 31 P nuclear magnetic resonance (NMR) spectroscopy, and X-ray photoemission spectroscopy [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Incommensurate magnet iron monophosphide FeP: Crystal growth and characterization

Chernyavskii

Nikitin

Onykiienko

et al. 2020

Phys. Rev. Materials

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We report an optimized chemical vapor transport method, which allows growing FeP single crystals up to 500 mg in mass and 80 mm 3 in volume. The high quality of the crystals obtained by this method was confirmed by means of EDX, high-resolution TEM, low-temperature single crystal XRD and neutron diffraction experiments. We investigated the transport and magnetic properties of the single crystals and calculated the electronic band structure of FeP. We show both theoretically and experimentally, that the ground state of FeP is metallic. The examination of the magnetic data reveals antiferromagnetic order below TN =119 K while transport remains metallic in both the paramagnetic and the antiferromagnetic phase. The analysis of the neutron diffraction data shows an incommensurate magnetic structure with the propagation vector Q = (0, 0, ±δ), where δ ≈ 0.2.For the full understanding of the magnetic state, further experiments are needed. The successful growth of large high-quality single crystals opens the opportunity for further investigations of itinerant magnets with incommensurate spin structures using a wide range of experimental tools.

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“…It was assumed that a very low maximal value of H hf (11 K) ≈ 36 kOe and its high anisotropy can be attributed to the stabilization of iron cations in the low-spin state (S F e = 1/2). It should be noted that recent XPS data 15 indicate, rather, the intermediate spin-3/2 value of the presumably Fe 3+ valence state of the iron ion. However, FeP exhibits metallic behaviour with complex narrow-band structure 12,16 , it has been controversial whether the Fe 3d states dominating magnetic properties are localized or itinerant.…”

Section: Introductionmentioning

confidence: 90%

NMR Analysis of the Magnetic Structure and Hyperfine Interactions in a FeP Binary Helimagnetic

et al. 2019

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We performed a 31 P NMR study of the metallic iron phosphide FeP in zero external magnetic field, as well as by sweeping the externally applied magnetic field H both on powder and single crystalline samples at several fixed frequencies. It was the main goal of our work to determine and explore the field dependent transformation of the magnetically ordered helical structure in FeP: the zero-field NMR spectrum for the polycrystalline sample can be easily explained assuming an incommensurate spiral ordering of Fe magnetic moments with a dominating contribution to the local field at the phosphorus nucleus from the Fe-31 P transferred hyperfine interactions. The components of the transferred hyperfine-interaction tensor were evaluated within a straightforward model approach. The NMR lineshape of the powdered FeP sample gradually changes with increasing field from the trapezoidal-like shape at low fields to a pronounced asymmetric double-horn shape at highest field. The former is typically obtained for powdered samples in applied magnetic fields while the latter is characteristic for the NMR spectra of non-magnetic atoms in single-crystalline helimagnets. The observed transformation of our 31 P NMR spectra of FeP provides strong evidence of the spin-reorientation of the spin-flop type in FeP which occurs in the range of strong external fields 4 < µ0H < 5 T confirmed also by specific-heat measurements. The line pattern of the single-crystal 31 P NMR spectra for external magnetic fields directed within the (ac)-plane exhibit a pronounced four-peak structure characteristic of an incommensurate helimagnetic ground state with two pairs of magnetically inequivalent phosphorus positions. These spectra were successfully simulated assuming a simple planar helix of Fe magnetic moments in the (ab)-plane with a phase shift of 36 degrees between Fe1-Fe3 and Fe2-Fe4 sites according to data from neutron scattering. Rotational single crystal field-sweep NMR experiments were performed both below and above the spin-reorientation transition field at fixed frequencies of νLarmor (31 P) = 33 MHz and 140 MHz, respectively. Theoretical estimations of the transferred hyperfine coupling provide an excellent quantitative description of the observed angular dependences for the experimentally determined field separations between the resonance fields of 31 P in magnetically ordered FeP and the resonance field of free Larmor precession, which serves as the diamagnetic reference field. Rotational single-crystal NMR experiments in high fields reveal an effect of varying phosphorous local fields distribution caused by an iron spin-reorientation transition in high magnetic field.

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X-ray photoelectron spectroscopy of FeP phosphide

Cited by 9 publications

References 31 publications

Crystallographic facet selective HER catalysis: exemplified in FeP and NiP₂ single crystals

Crystallographic facet selective HER catalysis: exemplified in FeP and NiP₂ single crystals

Incommensurate magnet iron monophosphide FeP: Crystal growth and characterization

NMR Analysis of the Magnetic Structure and Hyperfine Interactions in a FeP Binary Helimagnetic

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X-ray photoelectron spectroscopy of FeP phosphide

Cited by 9 publications

References 31 publications

Crystallographic facet selective HER catalysis: exemplified in FeP and NiP2 single crystals

Crystallographic facet selective HER catalysis: exemplified in FeP and NiP2 single crystals

Incommensurate magnet iron monophosphide FeP: Crystal growth and characterization

NMR Analysis of the Magnetic Structure and Hyperfine Interactions in a FeP Binary Helimagnetic

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Crystallographic facet selective HER catalysis: exemplified in FeP and NiP₂ single crystals

Crystallographic facet selective HER catalysis: exemplified in FeP and NiP₂ single crystals