A Neutron diffraction study of the magnetic structure of EuCo2P2

Reehuis, M.; Jeitschko, Wolfgang; Möller, Manfred; Brown, P. J.

doi:10.1016/0022-3697(92)90208-u

Cited by 89 publications

(89 citation statements)

References 22 publications

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“…Clearly, an experimental determination of the zero field magnetic structure is needed in order to go further in the understanding of EuNiGe 3 . This was the original aim arXiv:1605.03497v1 [cond-mat.str-el] 11 May 2016 of the present work, but while exploring the in-field metamagnetic behavior of EuNiGe 3 , we have found a number of magnetic phase transitions which were not detected by macroscopic measurements. Here we give the detailed description of these transitions with the field oriented along the b (a) and c directions and present a molecular field model with 4 exchange integrals which partially succeeds in reproducing both the zero field structure and the magnetization curves.…”

Section: Introductionmentioning

confidence: 65%

“…15. For the neutron diffraction study, a 3x3.7x1 mm 3 single crystal was mounted with the c axis or the b axis vertical in the variable temperature insert of a 7.5 T split-coil cryomagnet. Experiments were performed on the neutron diffractometer Super-6T2 (Orphée-LLB) 16 .…”

Section: Methodsmentioning

confidence: 99%

“…In this work, we present a neutron diffraction study of single crystalline EuNiGe 3 . EuNiGe 3 was the subject of two previous studies, on a polycrystalline sample 14 and on a single crystal 15 .…”

Section: Introductionmentioning

confidence: 99%

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Exploring metamagnetism of single crystallineEuNiGe3by neutron scattering

et al. 2016

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We present here a neutron diffraction study, both in zero field and as a function of magnetic field, of the magnetic structure of the tetragonal intermetallic EuNiGe 3 on a single crystalline sample. This material is known to undergo a cascade of transitions, first at 13.2 K towards an incommensurate modulated magnetic structure, then at 10.5 K to an equal moment, yet undetermined, antiferromagnetic structure. We show here that the low temperature phase presents a spiral moment arrangement with wave-vector k = ( 1 4 , δ, 0). For a magnetic field applied along the tetragonal c-axis, the square root of the scattering intensity of a chosen reflection matches very well the complex metamagnetic behavior of the magnetization along c measured previously. For the magnetic field applied along the b-axis, two magnetic transitions are observed below the transition to a fully polarized state.

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Section: Introductionmentioning

confidence: 65%

Section: Methodsmentioning

confidence: 99%

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Exploring metamagnetism of single crystallineEuNiGe3by neutron scattering

et al. 2016

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“…Furthermore, from neutron diffraction measurements EuCo 2 P 2 with the ThCr 2 Si 2 -type structure exhibits a (planar) helical structure with the Eu ordered moments aligned in the ab plane with the helix axis being the c axis, where the Co atoms were deduced to be nonmagnetic. 67 A comparative study of the reason for the divergent AFM structures of EuCu 2 As 2 , EuCu 2 Sb 2 , EuPd 2 Sb 2 and EuCo 2 P 2 using electronic structure calculations 64 would be enlightening.…”

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confidence: 99%

Antiferromagnetism inEuCu2As2andEuCu1.82Sb2single crystals

Anand

Johnston

2015

Phys. Rev. B

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Single crystals of EuCu2As2 and EuCu2Sb2 were grown from CuAs and CuSb self-flux, respectively. The crystallographic, magnetic, thermal and electronic transport properties of the single crystals were investigated by room-temperature x-ray diffraction, magnetic susceptibility χ versus temperature T , isothermal magnetization M versus magnetic field H, specific heat Cp(T ) and electrical resistivity ρ(T ) measurements. EuCu2As2 crystallizes in the body-centered tetragonal ThCr2Si2-type structure (space group I4/mmm), whereas EuCu2Sb2 crystallizes in the related primitive tetragonal CaBe2Ge2-type structure (space group P 4/nmm). The x-ray and energy-dispersive x-ray spectroscopy data for the EuCu2Sb2 crystals showed the presence of vacancies on the Cu sites, yielding the actual composition EuCu1.82Sb2. The ρ(T ) and Cp(T ) data reveal metallic character for both EuCu2As2 and EuCu1.82Sb2. Antiferromagnetic (AFM) ordering is indicated from the χ(T ), Cp(T ), and ρ(T ) data for both EuCu2As2 (TN = 17.5 K) and EuCu1.82Sb2 (TN = 5.1 K). In EuCu1.82Sb2, the ordered-state χ(T ) and M (H) data suggest either a collinear A-type AFM ordering of Eu +2 spins S = 7/2 or a planar noncollinear AFM structure, with the ordered moments oriented in the tetragonal ab plane in either case. This ordered-moment orientation for the A-type AFM is consistent with calculations with magnetic dipole interactions. The anisotropic χ(T ) and isothermal M (H) data for EuCu2As2, also containing Eu +2 spins S = 7/2, strongly deviate from the predictions of molecular field theory for collinear AFM ordering and the AFM structure appears to be both noncollinear and noncoplanar.

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“…This structure and the common BaNiSn 3 structures are both derivatives of the BaAl 4 -type structure [26]. ThCr 2 Si 2 -type AM 2 X 2 compounds (A: an alkaline earth or a lanthanide element; M: a transition metal; X: P, Ge, or As) have also been widely studied due to their superconducting and magnetic properties [27][28][29][30][31][32][33][34]. Recently, the lattice parameters, electronic structures, elastic constants, Vicker's hardness and thermodynamics properties of SrAuSi 3 were systematically investigated by using first-principles and the quasi-harmonic Debye model [35].…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of superconductivity in SrAuSi3 and SrAu2Si2

Arslan

Karaca

Tütüncü

et al. 2016

Journal of Physics and Chemistry of Solids

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The structural and electronic properties of BaNiSn 3 -type SrAuSi 3 and ThCr 2 Si 2 -type SrAu 2 Si 2 have been investigated by using the planewave pseudopotential method and the density functional theory. The electronic structures and phonon dispersion relations of these two materials have been analyzed with and without the inclusion of spin-orbit interaction, and similarities and differences highlighted. By integrating the Eliashberg spectral function α 2 F(ω), the average electron-phonon coupling parameter is determined to be λ = 0.47 for SrAuSi 3 and 0.42 for SrAu 2 Si 2 . The largest contribution to the electron-phonon coupling for SrAuSi 3 comes from the Si p electrons near the Fermi energy and Si-related vibrations. Using a reasonable value of µ * = 0.12 for the effective Coulomb repulsion parameter, the superconducting critical temperature T c for SrAuSi 3 is found to be 1.47 K which compares very well with its experimental value of 1.54 K.

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A Neutron diffraction study of the magnetic structure of EuCo2P2

Cited by 89 publications

References 22 publications

Exploring metamagnetism of single crystallineEuNiGe3by neutron scattering

Exploring metamagnetism of single crystallineEuNiGe3by neutron scattering

Antiferromagnetism inEuCu2As2andEuCu1.82Sb2single crystals

Theoretical investigation of superconductivity in SrAuSi3 and SrAu2Si2

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