Universal Magnetic Structure of the Half-Magnetization Phase in Cr-Based Spinels

Matsuda, M.; Ohoyama, Kenji; Yoshii, Shunsuke; Nojiri, Hiroyuki; Frings, P.; Duc, F.; Vignolle, Baptiste; Rikken, G. L. J. A.; Regnault, L.P.; Lee, S.-H.; Ueda, Hiroaki; Ueda, Yutaka

doi:10.1103/physrevlett.104.047201

Cited by 38 publications

(38 citation statements)

References 34 publications

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“…In this material, the Curie-Weiss temperature, CW Θ = -70 K, is an order of magnitude larger than the Néel temperature indicating a high level of magnetic frustration [48]. The antiferromagnetic ordering in CdCr 2 O 4 at N T = 7.8 K is accompanied by a cubic ( 3 Fd m ) to tetragonal ( 1 4 / I amd ) structural change [55], which can be considered as a spin Jahn-Teller phase transition driven by spin frustrations [48]. Spin-orbit coupling is negligible in this compound.…”

Section: Frustrated Antiferromagnetsmentioning

confidence: 96%

“…A cubic crystallographic structure has been suggested from high-field x-ray data in the plateau state [56]. Neutron-scattering experiments in pulsed magnetic fields showed that the magnetic structure in the plateau phase had a cubic 3 4 32 P symmetry [55]. It has been proposed that a lattice distortion stabilizes the 3-up 1-down collinear spin configuration [52,53].…”

Section: Frustrated Antiferromagnetsmentioning

confidence: 99%

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Spin-lattice effects in selected antiferromagnetic materials (Review Article)

Жерлицын

Yasin

Wosnitza

et al. 2014

Low Temperature Physics

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Spin-lattice effects play an important role in many magnetic materials. In this short review, we give some examples of such effects studied in low-dimensional, frustrated as well as uranium-based antiferromagnets. Utilizing ultrasound measurements at low temperatures and high magnetic fields provides valuable information on the spin-strain interactions. Specifically phase transformations and critical phenomena in magnetic systems with strong spin-lattice interactions are fruitful grounds for sound-velocity and sound-attenuation measurements. PACS

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Section: Frustrated Antiferromagnetsmentioning

confidence: 96%

Section: Frustrated Antiferromagnetsmentioning

confidence: 99%

Spin-lattice effects in selected antiferromagnetic materials (Review Article)

Жерлицын

Yasin

Wosnitza

et al. 2014

Low Temperature Physics

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“…In addition, they combine magnetic and lattice degrees of freedom, which confer them a magnetostructural flexibility in zero and finite magnetic field. The interplay between magnetic frustration and magnetoelastic coupling has been intensively studied in spinels with, for instance, either V 3+ or Cr 3+ on the B site and various ions on the A site (Hg, Mg, Cd and Zn) [1][2][3][4][5][6]. In these systems, at the Néel temperature (T N ), a transition to an antiferromagnetic (AFM) ordering is accompanied by a cubic to tetragonal or orthorhombic structural distortion.…”

Section: Introductionmentioning

confidence: 99%

Field-driven magnetostructural transitions in GeCo2O4

et al. 2017

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In the spinel compound GeCo2O4, the Co 2+ pyrochlore sublattice presents remarkable magnetic field-induced behaviors that we unveil through neutron and X-ray single-crystal diffraction. The Néel ordered magnetic phase is entered through a structural lowering of the cubic symmetry. In this phase, when a magnetic field is applied along a 2-fold cubic direction, a spin-flop transition of one fourth of the magnetic moments releases the magnetic frustration and triggers magnetostructural effects. At high field, these ultimately lead to an unusual spin reorientation associated with structural changes.

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“…A theory based on DzyaloshinskiiMoriya interactions was proposed to explain the static spin-lattice coupling in CdCr 2 O 4 13,14 . The effect of magnetic ordering on zone-center phonons has been well studied both from first principles and in experiment 13,[15][16][17] . Recently, experimental observation has been extended to the full phonon dispersion relation of CdCr 2 O 4 18 and its changes through the phase transition.…”

Section: Introductionmentioning

confidence: 99%

Spin-lattice coupling and phonon dispersion of CdCr2O4from first principles

2012

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First principles calculations are used to investigate the effects of magnetic ordering on the minimum-energy structure and on the full phonon dispersion relation of CdCr2O4, focusing on the changes through the coupled magnetic/structural transition which shows relief of the geometric frustration of the antiferromagnetic ordering on the pyrochlore lattice. We computed the full phonon dispersion relations for the ferromagnetic and antiferromagnetic orderings in cubic and tetragonal structures of CdCr2O4. We extracted the phonon dispersion for the cubic paramagnetic phase and found that it compares well with the experimental results. The AFM ordering is seen to lower the symmetry and induce a lattice distortion comparable in magnitude to that observed in the transition. While the spin-phonon couplings are large for modes which involve displacement of the Cr atoms, there are no unstable modes at any point in the Brillouin zone for either of the magnetic orderings considered, and thus we conclude that the phase transition is driven not by spin-phonon coupling, but by the atomic forces and stresses induced by the magnetic order. Finally, by comparison of the phonon frequencies for structures with different magnetic orderings and structural distortions, we find that the spin-phonon coupling, rather than the coupling of the phonons to the structural change, is the dominant factor in the observed changes of phonon frequencies through the phase transition.

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Universal Magnetic Structure of the Half-Magnetization Phase in Cr-Based Spinels

Cited by 38 publications

References 34 publications

Spin-lattice effects in selected antiferromagnetic materials (Review Article)

Spin-lattice effects in selected antiferromagnetic materials (Review Article)

Field-driven magnetostructural transitions in GeCo2O4

Spin-lattice coupling and phonon dispersion of CdCr2O4from first principles

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