scholarly journals Symmetry analysis of complex magnetic structure in monoclinically distorted Er3Cu4Sn4

2021 ◽  
Vol 77 (2) ◽  
pp. 219-224
Author(s):  
Stanisław Baran ◽  
Aleksandra Deptuch ◽  
Bogusław Penc ◽  
Andreas Hoser ◽  
Andrzej Szytuła
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Neutron Diffraction ◽  
Magnetic Structure ◽  
Low Temperatures ◽  
Magnetic Moments ◽  
Symmetry Analysis ◽  
Monoclinic Space Group ◽  
Modulated Structure ◽  
Powder Neutron Diffraction

The magnetic structure in Er3Cu4Sn4 has been determined using high-resolution powder neutron diffraction, supported by symmetry analysis. At low temperatures, Er3Cu4Sn4 assumes a crystal structure of the Tm3Cu4Sn4 type (in the monoclinic space group C2/m). The Er atoms occupy two distinct Wyckoff sites: 2c and 4i. It has been found that the Er magnetic moments on the 2c site form a commensurate antiferromagnetic structure (k 1 = [0, 0, ½]) below 6 K. The magnetic moments reach 8.91 (8) μB at 1.4 K and are parallel to the b axis. The Er magnetic moments on the 4i site order below 2 K and form an incommensurate antiferromagnetic sine-modulated structure (k 2 = [1, 0.4667 (1), ½]), with magnetic moments lying in the ac plane and perpendicular to the a axis. The amplitude of modulation equals 8.7 (1) μB at 1.4 K.

The crystal structure of KCaF3 at 4.2 and 300 K: A re-evaluation using high-resolution powder neutron diffraction

2005 ◽  
Vol 20 (1) ◽  
pp. 7-13 ◽  
Author(s):  
K. S. Knight ◽  
C. N. W. Darlington ◽  
I. G. Wood
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Neutron Diffraction ◽  
Perovskite Phase ◽  
Lattice Parameters ◽  
Monoclinic Space Group ◽  
Space Group ◽  
Powder Neutron Diffraction

The crystal structure of the perovskite phase KCaF3 has been redetermined at 4.2 and 300 K using powder neutron diffraction collected at the highest resolution. At both temperatures the phase was found to be orthorhombic in space group Pnma, with lattice parameters a=0.622 879(5) nm, b=0.870 031(7) nm, c=0.611 210(5) nm at 4.2 K, and a=0.621 488(6) nm, b=0.876 360(8) nm, c=0.616 481(6) nm at 300 K. The CaF6 octahedron is regular at both temperatures with octahedral rotations of 9.6° and 13.2° for the in-phase and anti-phase tilts, respectively, at 4.2 K. No evidence was found to support the recent revision of the space group from Pnma to the monoclinic space group B21∕m.

Problems of studying the crystal structure of Ce1−xLax11B6 solid solutions by high-resolution powder neutron diffraction

1991 ◽  
Vol 24 (2) ◽  
pp. 142-145 ◽  
Author(s):  
V. A. Trunov ◽  
A. L. Malyshev ◽  
D. Yu. Chernyshov ◽  
A. I. Kurbakov ◽  
M. M. Korsukova ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Neutron Diffraction ◽  
Solid Solutions ◽  
Powder Neutron Diffraction

The crystal structure of CBrF3by high-resolution powder neutron diffraction

1992 ◽  
Vol 77 (1) ◽  
pp. 45-50 ◽  
Author(s):  
A. Jouanneaux ◽  
A.N. Fitch ◽  
J.K. Cockcroft
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Neutron Diffraction ◽  
Powder Neutron Diffraction

scholarly journals Crystal and magnetic structures of R 2Ni1.78In compounds (R = Tb, Ho, Er and Tm)

2021 ◽  
Vol 77 (5) ◽  
pp. 824-832
Author(s):  
Stanisław Baran ◽  
Aleksandra Deptuch ◽  
Andreas Hoser ◽  
Bogusław Penc ◽  
Yuriy Tyvanchuk ◽  
...  
Keyword(s):  
Rare Earth ◽  
Neutron Diffraction ◽  
Magnetic Structure ◽  
Magnetic Moments ◽  
Symmetry Analysis ◽  
Crystalline Electric Field ◽  
Magnetic Structures ◽  
Antiferromagnetic Ordering ◽  
Crystal And Magnetic Structures ◽  
The Rare Earth

The crystal and magnetic structures in R 2Ni1.78In (R = Ho, Er and Tm) have been studied by neutron diffraction. The compounds crystallize in a tetragonal crystal structure of the Mo2FeB2 type (space group P4/mbm). At low temperatures, the magnetic moments, localized solely on the rare earth atoms, form antiferromagnetic structures described by the propagation vector k = [kx , kx , ½], with kx equal to ¼ for R = Er and Tm or 0.3074 (4) for R = Ho. The magnetic moments are parallel to the c axis for R = Ho or lie within the (001) plane for R = Er and Tm. The obtained magnetic structures are discussed on the basis of symmetry analysis. The rare earth magnetic moments, determined from neutron diffraction data collected at 1.6 K, are 6.5 (1) μB (Er) and 6.09 (4) μB (Tm), while in the incommensurate modulated magnetic structure in Ho2Ni1.78In the amplitude of modulation of the Ho magnetic moment is 7.93 (8) μB. All these values are smaller than those expected for the respective free R 3+ ions. A symmetry analysis of the magnetic structure in Tb2Ni1.78In is also included, as such information is missing from the original paper [Szytuła, Baran, Hoser, Kalychak, Penc & Tyvanchuk (2013). Acta Phys. Pol. A, 124, 994–997]. In addition, the results of magnetometric measurements are reported for Tm2Ni1.78In. The compound shows antiferromagnetic ordering below the Néel temperature of 4.5 K. Its magnetic properties are found to originate from magnetic moments localized solely on the thulium atoms (the nickel atoms remain non-magnetic in Tm2Ni1.78In). The reduction of rare earth magnetic moments in the ordered state in R 2Ni1.78In (R = Tb, Ho, Er and Tm) and the change in direction of the moments indicate the influence of the crystalline electric field (CEF) on the stability of the magnetic order in the investigated compounds.

scholarly journals Non-collinear magnetic structure of manganese quadruple perovskite CdMn7O12

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
H. Guo ◽  
M. T. Fernández-Díaz ◽  
L. Zhou ◽  
Y. Yin ◽  
Y. Long ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Separation ◽  
Neutron Diffraction ◽  
Magnetic Structure ◽  
Structural Phase Transition ◽  
Magnetic Moments ◽  
Structural Phase ◽  
Powder Neutron Diffraction ◽  
Propagation Vector ◽  
Absorbing Material

Abstract We report on the magnetic structure of CdMn7O12 determined by powder neutron diffraction. We were able to measure the magnetic structure of this Cd containing and highly neutron absorbing material by optimizing the sample geometry and by blending the CdMn7O12 with Aluminum powder. Below its Néel temperature T N1 all magnetic reflections can be indexed by a single commensurate propagation vector k = (0, 0, 1). This is different to the case of CaMn7O12 where the propagation vector is incommensurate and where an in-plane helical magnetic structure has been found. We observe a commensurate non-collinear magnetic structure in CdMn7O12 with in-plane aligned magnetic moments resembling the ones in CaMn7O12. However, the commensurate propagation vector prevents the appearance of a helical magnetic structure in CdMn7O12. Finally, we also observe a third structural phase transition below ~60 K that can be attributed to phase separation.

scholarly journals Magnetic structure study of the sawtooth chain antiferromagnet $$\hbox {Fe}_2\hbox {Se}_2\hbox {O}_7$$

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kazuhiro Nawa ◽  
Maxim Avdeev ◽  
Peter Berdonosov ◽  
Alexey Sobolev ◽  
Igor Presniakov ◽  
...  
Keyword(s):  
Dispersion Relation ◽  
Neutron Diffraction ◽  
Magnetic Structure ◽  
Spin Wave ◽  
Magnetic Moments ◽  
Structure Study ◽  
Flat Band ◽  
Magnetization Measurements ◽  
Wave Approximation ◽  
Powder Neutron Diffraction

AbstractA magnetic structure of the sawtooth-chain antiferromagnet $$\hbox {Fe}_2\hbox {Se}_2\hbox {O}_7$$ Fe 2 Se 2 O 7 was investigated by magnetization measurements, single crystalline and powder neutron diffraction experiments, and a further analysis on the Mössbauer spectra. These experiments revealed a nearly collinear antiferromagnetic structure with magnetic moments aligned along the b-axis, indicating dominant antiferromagnetic exchanges between Fe(1)–Fe(2) and Fe(2)–Fe(3) sites. The magnon dispersion relation derived from the linear spin wave approximation suggests the possible flat band nature of magnons.

Low Temperature Magnetic Structure of CrNiAs

2004 ◽  
Vol 443-444 ◽  
pp. 379-382 ◽  
Author(s):  
M. Bacmann ◽  
Daniel Fruchart ◽  
A. Koumina ◽  
P. Wolfers
Keyword(s):  
Low Temperature ◽  
Neutron Diffraction ◽  
Magnetic Structure ◽  
Diffraction Data ◽  
Magnetic Moments ◽  
Neutron Diffraction Data ◽  
Temperature Range ◽  
Powder Neutron Diffraction ◽  
Integrated Intensity ◽  
Typical Satellite

The magnetic structure of CrNiAs was determined from magnetisation and powder neutron diffraction experiments. In the 110-182 K temperature range, the compound is ferromagnetic, resulting mainly from the Cr moment of 1.25(5) μB. Below 110 K, neutron diffraction data reveals typical satellite reflections which propagation vector is 0.228 c*. A model of oscillating magnetic moments was refined from the integrated intensity of the few additional lines.

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