Neutron diffraction study of the magnetic structure of HoCu2

doi:10.1016/0304-8853(86)90023-5

Journal of Magnetism and Magnetic Materials

Volume 59, Issues 1–2, May 1986, Pages 145-152

https://doi.org/10.1016/0304-8853(86)90023-5 Get rights and content

Abstract

Neutron diffraction measurements show that in the temperature range from 7.4 to T_N=10.4 K the magnetic structure of HoCu₂ is a commensurably modulated a-axis collinear structure with a wave vector q₁=1/3a^∗. Below 7.4 K an additional structure component develops and the low temperature magnetic structure of HoCu₂ is found to be an incommensurably modulated non-collinear structure characterized by wave vectors q₁=/13;a^∗, q₂=q_cc^∗ and 2q₂, where a^∗ and c^∗ are reciprocal lattice vectors of the orthorhombic structure and q_c=0.300±0.005. The corresponding moment components μ-_q1, μ_q2 and μ_2q2 lie along the a, b and b directions of the orthorhombic crystal lattice, respectively.

References (15)

N.H. Luong et al.
J. Magn. Magn. Mat.
(1985)
D.G. Lord et al.
J. Magn. Magn. Mat.
(1980)
Z. Smetana et al.
Physica
(1985)
V. Šíma et al.
J. Magn. Magn. Mat.
(1986)
R.C. Sherwood et al.
J. Appl. Phys.
(1964)
Y. Hashimoto et al.
J. Phys. Soc. Japan
(1979)
E. Gratz et al.
Phys. Stat. Sol. (b)
(1982)

There are more references available in the full text version of this article.

Cited by (19)

The normal and inverse magnetocaloric effect in RCu<inf>2</inf> (R=Tb, Dy, Ho, Er) compounds
2017, Journal of Magnetism and Magnetic Materials
Citation Excerpt :
Much work has also been done on the specific heat, magnetoresistance, magnetostriction in RCu2 compounds [30–35]. Giant magnetostriction was observed in TbCu2 and DyCu2 crystals. The magnetic structures and magnetic transitions of HoCu2 compound were investigated by magnetic, specific heat and Neutron Powder Diffraction experiments [36–38]. Two magnetic transitions were observed in HoCu2 compound at 7.4 K and 10.5 K, respectively [33,36,37].
Orthorhombic polycrystalline RCu₂ (R=Tb, Dy, Ho and Er) compounds were synthesized and the magnetic properties and magnetocaloric effect (MCE) were investigated in detail. All of the RCu₂ compounds are antiferromagnetic (AFM) ordered. As temperature increases, RCu₂ compounds undergo an AFM to AFM transition at T_t and an AFM to paramagnetic (PM) transition at T_N. Besides of the normal MCE around T_N, large inverse MCE around T_t was found in TbCu₂ compound. Under a field change of 0–7 T, the maximal value of inverse MCE is even larger than the value of normal MCE around T_N for TbCu₂ compound. Considering of the normal and inverse MCE, TbCu₂ shows the largest refrigerant capacity among the RCu₂ (R=Tb, Dy, Ho and Er) compounds indicating its potential applications in low temperature multistage refrigeration.
Thermodynamic assessments of the Ho-X (X: Cu, Mo, V) systems
2009, Journal of Alloys and Compounds
The thermodynamic assessments of the Ho–X (X: Cu, Mo, V) systems have been carried out by using the CALPHAD (Calculation of Phase Diagrams) method based on available experimental data including thermodynamic properties and phase equilibria. Gibbs free energies of the solution phases (liquid, hcp, fcc and bcc phase) were described by the subregular solution model with the Redlich–Kister formula, and those of the intermetallic compounds (αCu₅Ho, βCu₅Ho, Cu₉Ho₂, Cu₇Ho₂, Cu₂Ho and CuHo compound) in the Cu–Ho system were described by the sublattice model. Good agreement between the present calculated results and experimental data was obtained.
Isothermal cross-section of the Cu-Ho-Sb phase diagram at 500 °C
2003, Journal of Alloys and Compounds
The isothermal section of the Cu–Ho–Sb ternary system at 500 °C has been investigated over the whole concentration range mainly by powder X-ray diffraction with the aid of optical microscopy and scanning electron microscopy. The formation of the previously reported Cu₃Ho₃Sb₄ and CuHoSb₂ phases was confirmed and a new ternary compound Cu₅Ho₇Sb which crystallizes in the tetragonal, space group P4/nbm (no. 125) with a new structure type and a=0.62008(3) nm, c=0.87807(4) nm was found.
Effect of the crystalline electric field on the Neel temperatures of RCu<inf>2</inf> compounds
2001, Journal of Magnetism and Magnetic Materials
Incommensurate magnetic structures in TbRhGe
1995, Journal of Magnetism and Magnetic Materials
TbRhGe, which exhibits the TiNiSi-type crystal structure orders antiferromagnetically below 23 K. At 1.7 K its magnetic structure is described by a sine-modulated spin wave with a wave vector k = [0, 0.45, 0.11]. At 18 K it transforms into a magnetic structure represented by the wave vector k = [0, 0.44, 0]. The magnetic moment localized on terbium amounts to 7.6(1) Bohr magnetons at 1.7 K and is aligned along the a-axis of the orthorhombic TiNiSi-type unit cell in both magnetic structures.
Incommensurate magnetic ordering in CePtSn and TbPtSn
1995, Journal of Magnetism and Magnetic Materials
The crystal and magnetic structures of CePtSn and TbPtSn were determined by neutron diffraction on polycrystalline samples. Both compounds exhibit the orthorhombic TiNiSi-type of crystal structure and order antiferromagnetically below 7.8 K (CePtSn) and 13.8 K (TbPtSn). In CePtSn a sine modulated magnetic ordering described by the propagation vector k = (0, 0.428, 0) has been found at 1.7 K. In TbPtSn the magnetic structure at 1.7 K is also sine modulated and is characterized by the wave vector k = (0, 0.300, 0.059). It transforms at 10 K into a structure with the wave vector k = (0, 0.275, 0). The magnitudes of the magnetic moments at 1.7 K localized on cerium and terbium ions are determined to be 0.97(5) and 9.06(5)μ_B respectively.

View all citing articles on Scopus

View full text

Neutron diffraction study of the magnetic structure of HoCu2

Abstract

J. Magn. Magn. Mat.

J. Magn. Magn. Mat.

Physica

J. Magn. Magn. Mat.

J. Appl. Phys.

J. Phys. Soc. Japan

Phys. Stat. Sol. (b)

Neutron diffraction study of the magnetic structure of HoCu₂