Mn magnetism and magnetic structures in RMn2

Ballou, R.; Déportes, J.; Lemaire, R.; Ouladdiaf, B.

doi:10.1063/1.340745

Cited by 43 publications

(15 citation statements)

References 6 publications

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“…On the other hand, besides the Dy sample the direction of the magnetic moments in the hightemperature phase is the same in all samples, and it coincides with that in YMn 2 D 4. 3 . This suggests that in the temperature range T R ϽTϽT N the spin orientation is governed by Mn anisotropy.…”

Section: Reorientation Transitionsmentioning

confidence: 95%

“…1,2 Secondly, in the C15 structure of the cubic Laves phases, the T atoms form a pyrochlore-like sublattice, which is known as fully frustrated for first-neighbor antiferromagnetic interactions. 3 In the pyrochlore lattice, no spin arrangement minimizes the free energy, which results in a fully degenerated spin-liquid state at Tϭ0 K. [4][5][6] Among the compounds where the transition metal carries an intrinsic moment, YMn 2 is the only one where antiferromagnetic long-range order appears in the frustrated Mn sublattice. The frustration yields a complicated helicoidal order associated with a structural distortion at the Néel transition.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and hydrogen ordering in the frustrated Laves hydridesRMn2H4.5
Goncharenko
¹
,
Mirebeau
²
,
Irodova
³

et al. 1999
Phys. Rev. B
44
9
39
0
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We have studied the magnetic and crystal structures of different Laves hydrides RMn 2 H 4.5 (RϭY, Gd, Tb, Dy, Ho͒, having the cubic C15 structure at high temperature. We observe a strong coupling between the hydrogen and magnetic order in the frustrated Mn sublattice. The Néel temperature coincides with the ordering temperature in the hydrogen sublattice, resulting in a single magnetostructural transition. In contrast to the RMn 2 compounds, in the hydrides the Mn-Mn magnetic interaction dominates and it imposes the magnetic order in the rare-earth sublattice. On the other hand, the anisotropy of the rare-earth ion strongly influences the orientation of the magnetic moments at low temperature. The Laves hydrides show a very unusual case where the structural and magnetic orders strongly interact with each other. They also offer many examples of the interplay between the localized Mn moments and the rare-earth moments. ͓S0163-1829͑99͒13213-2͔

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Section: Reorientation Transitionsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Magnetic and hydrogen ordering in the frustrated Laves hydridesRMn2H4.5
Goncharenko
¹
,
Mirebeau
²
,
Irodova
³

et al. 1999
Phys. Rev. B
44
9
39
0
View full text Add to dashboard Cite

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“…A high degree of frustration arises for the Mn antiferromagnetism, leading to complicated magnetic structures (Ballou et al, 1988). Neutron-diffraction measurements have revealed that the low-temperature magnetic phase of TbMn 2 is metastable and poised between magnetic configurations with propagation vectors ( 2 3 2 3 0) and ( 1 2 1 2 1 2 ), respectively (Ballou et al, 1992).…”

Section: Related Electronic Magnetsmentioning

confidence: 99%

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

1997

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This paper is a comprehensive review of almost twenty years of research on nuclear magnetic ordering, first in copper and later in silver and rhodium metals. The basic principles of nuclear magnetism and the measurement of positive and negative spin temperatures are discussed first. Cascade nuclear refrigeration techniques, susceptibility and nuclear-magnetic-resonance (NMR) measurements, and arrangements for neutron-diffraction experiments at nanokelvin and picokelvin temperatures are described next. Comprehensive magnetic-susceptibility and neutron-diffraction measurements on copper, which led to the discovery of at least three antiferromagnetic phases, one displaying the novel (0 2 3 2 3 ) spin structure and the other two showing the type-I order of the fcc system, are then described in detail. NMR data on silver, at TϾ0 and TϽ0, are presented next leading to the observation that silver orders antiferromagnetically at positive spin temperatures and ferromagnetically at negative spin temperatures. The authors discuss recent neutron-diffraction measurements that show that the antiferromagnetic structure at TϾ0 is in a single-k type-I state. NMR data on rhodium at TϾ0 and TϽ0 are also described. Results obtained on Tl, Sc, AuIn 2 , and metallic Pr compounds and on insulators like CaF 2 are then discussed briefly. The paper is concluded by an extensive theoretical section. Calculations of conduction-electron mediated exchange interactions are described, and the mean-field theory of nuclear magnetic ordering is presented. The role of thermal and quantum fluctuations is then discussed, particularly in the selection of the antiferromagnetic ground state. Finally, theoretically calculated magnetic phase diagrams and ordered spin structures of copper and silver are presented in detail and compared with experimental results. The overall agreement is good, affirming the value of nuclear magnets in Cu and Ag as realizations of simple physical models. [S0034-6861(97)00301-2] ogy,

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“…A large thermal expansion coefficient is also measured in the paramagnetic phase, which was interpreted in terms of a thermal increase of the mean-square local amplitude of Mn fluctuating moments [1]. As revealed by elastic neutron scattering on powdered samples the magnetic structures can be very complicated [2].…”

Section: Magnetic-ordered Phasesmentioning

confidence: 94%

“…The magnetocrystalline anisotropy associated with Mn is similarly far from being negligible. Complicated Néel orders (noncollinear, incommensurate, with weak-coupling features, multipropagating, …) are the results [2]. We mention in the following some of these magnetic-ordered phases.…”

Section: Introductionmentioning

confidence: 91%

Geometric frustration in the RMn₂ Laves phase compounds

Ballou¹

2001

Can. J. Phys.

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An overview of neutron-scattering investigations of the geometrically frustrated Mn itinerant-electron magnetism in the RMn 2 Laves phase compounds is given. Magnetic structures of magnetically ordered compounds are briefly described, in particular the mixed phases where magnetic and nonmagnetic Mn coexist. Magnetic correlations in the paramagnetic phase of YMn 2 and in (Y 0.97 Sc 0.03 )Mn 2 , where the substitution of Sc for Y inhibits the magnetic order down to the lowest temperatures, are then discussed. An unusual neutron-scattering function S(Q, ω) is measured, which appear to arise from an itinerantelectron spin liquid. PACS Nos.: 71.27+a, 75.40Gb, 75.50EeRésumé : Nous passons en revue les études par diffusion de neutrons du magnétisme de l'électron itinérant du Mn géométriquement frustré dans des composés de Laves RMn 2 . Nous décrivons brièvement les structures magnétiques des composés orientés magnétiquement, en particulier les phases mixtes où coexistent des Mn magnétiques et non magnétiques. Nous analysons les corrélations magnétiques dans la phase paramagnétique de YMn 2 et dans (Y 0.97 Sc 0.03 )Mn 2 où la substitution de Sc pour Y entrave l'ordre magnétique jusqu'aux températures les plus basses. Nous mesurons une fonction de diffusion de neutrons inhabituelle, S(Q, ω), qui semble résulter d'un liquide de spin avec électron itinérant.[Traduit par la Rédaction]

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Mn magnetism and magnetic structures in RMn2

Abstract: Because of the tetrahedral arrangement of the Mn atoms in the Laves phases, the magnetic structures of the RMn2 are frustrated. To reduce this frustration, very unusual magnetic structures are stabilized with large crystallographic distortion.

Cited by 43 publications

References 6 publications

Magnetic and hydrogen ordering in the frustrated Laves hydridesRMn2H4.5
Goncharenko
¹
,
Mirebeau
²
,
Irodova
³

et al. 1999
Phys. Rev. B
44
9
39
0
View full text Add to dashboard Cite

Magnetic and hydrogen ordering in the frustrated Laves hydridesRMn2H4.5
Goncharenko
¹
,
Mirebeau
²
,
Irodova
³

et al. 1999
Phys. Rev. B
44
9
39
0
View full text Add to dashboard Cite

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

Geometric frustration in the RMn₂ Laves phase compounds

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Mn magnetism and magnetic structures in RMn2

Abstract: Because of the tetrahedral arrangement of the Mn atoms in the Laves phases, the magnetic structures of the RMn2 are frustrated. To reduce this frustration, very unusual magnetic structures are stabilized with large crystallographic distortion.

Cited by 43 publications

References 6 publications

Magnetic and hydrogen ordering in the frustrated Laves hydridesRMn2H4.5Goncharenko1, Mirebeau2, Irodova3 et al. 1999Phys. Rev. B449390View full textAdd to dashboardCite

Magnetic and hydrogen ordering in the frustrated Laves hydridesRMn2H4.5Goncharenko1, Mirebeau2, Irodova3 et al. 1999Phys. Rev. B449390View full textAdd to dashboardCite

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

Geometric frustration in the RMn2 Laves phase compounds

Contact Info

Product

Resources

About

Magnetic and hydrogen ordering in the frustrated Laves hydridesRMn2H4.5
Goncharenko
¹
,
Mirebeau
²
,
Irodova
³

et al. 1999
Phys. Rev. B
44
9
39
0
View full text Add to dashboard Cite

Magnetic and hydrogen ordering in the frustrated Laves hydridesRMn2H4.5
Goncharenko
¹
,
Mirebeau
²
,
Irodova
³

et al. 1999
Phys. Rev. B
44
9
39
0
View full text Add to dashboard Cite

Geometric frustration in the RMn₂ Laves phase compounds