High-Field Multi-Frequency ESR in the Rare-Earth Spinel Compound CdYb2S4

Yoshizawa, Daichi; Kida, Takanori; Nakatsuji, Satoru; Iritani, K.; Halim, Mario; Takeuchi, Tetsuya; Hagiwara, Masayuki

doi:10.1007/s00723-015-0651-x

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…4(a)). This gapless feature is expected for a linearly dispersive Nambu-Goldstone mode in three dimensional systems and consistent with the results seen in the electron spin resonance (ESR) measurements for CdYb 2 S 4 52 . A similar T 3 power law dependence of C M was observed in the antiferromagnetic XY pyrochlore oxide Er 2 Ti 2 O 7 23,25,53 .…”

supporting

confidence: 88%

Frustrated magnetism in the Heisenberg pyrochlore antiferromagnets $A$Yb$_2$$X$$_4$ ($A$ = Cd, Mg, $X$ = S, Se)

Higo,

Iritani,

Halim

et al. 2016

Preprint

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Our polycrystalline sample study on the Yb-based chalcogenide spinels AYb2X4 (A = Cd, Mg, X = S, Se) has revealed frustrated magnetism due to the antiferromagnetically coupled Heisenberg spin on the pyrochlore lattice. Our crystal electric field analysis indicates the Yb ground state has nearly Heisenberg spins with a strong quantum character of the ground doublet. All the materials exhibit an antiferromagnetic order at 1.4-1.8 K, much lower temperature than the antiferromagnetic exchange coupling scale of ∼ 10 K. The magnetic specific heat CM shows a T 3 dependence, indicating the gapless feature in the Yb-based chalcogenide spinels. The magnetic entropy change much smaller than R ln 2 below the Néel temperature and the small local magnetic field estimated from the µSR measurements strongly suggest the significantly reduced size of the ordered moment in comparison with the bare moment size 1.33 µB/Yb supporting strong fluctuations in the commensurate and incommensurate ordered states in CdYb2S4 and MgYb2S4, respectively.

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supporting

confidence: 88%

Frustrated magnetism in the Heisenberg pyrochlore antiferromagnets $A$Yb$_2$$X$$_4$ ($A$ = Cd, Mg, $X$ = S, Se)

Higo,

Iritani,

Halim

et al. 2016

Preprint

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“…Below T N , the specific heat was found to decrease roughly as ∼ T 3 as T → 0, suggesting the presence of linearly dispersing gapless modes [27]. Evidence for such gapless excitations in CdYb 2 S 4 has also been suggested from electron spin-resonance (ESR) measurements [89]. Of the possible ordered states expected for the nearest-neighbor anisotropic exchange model, this is only consistent with the (nearly) gapless spectrum expected in a Γ 5 state [90], as found in Er 2 Ti 2 O 7 [12,20,91,92].…”

Section: A Spinelsmentioning

confidence: 88%

Frustration and anisotropic exchange in ytterbium magnets with edge-shared octahedra

2018

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We consider the structure of anisotropic exchange interactions in ytterbium-based insulating rare-earth magnets built from edge-sharing octahedra. We argue the features of trivalent ytterbium and this structural configuration allow for a qualitative determination of the different anisotropic exchange regimes that may manifest in such compounds. The validity of such super-exchange calculations is tested through comparison to the wellcharacterized breathing pyrochlore compound Ba 3 Yb 2 Zn 5 O 11 . With this in hand, we then consider applications to three-dimensional pyrochlore spinels as well as two-dimensional honeycomb and triangular lattice systems built from such edge-sharing octahedra. We find an extended regime of robust emergent weak anisotropy with dominant antiferromagnetic Heisenberg interactions as well as smaller regions with strong anisotropy. We discuss the implications of our results for known compounds with the above structures, such as the spinels AYb 2 X 4 (A = Cd, Mg, X = S, Se), the triangular compound YbMgGaO 4 , which have recently emerged as promising candidates for observing unconventional magnetic phenomena. Finally, we speculate on implications for the R 2 M 2 O 7 pyrochlore compounds and some little studied honeycomb ytterbium magnets.

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“…This two-stage ordering has become synonymous with phase competition [21]. More direct evidence of competing phases comes from the low magnetic fields required to destabilize their magnetic ground state, as was first observed in CdYb 2 S 4 with electron spin resonance [65]. At moderate fields there is a crossover from the XY antiferromagnetic Γ 5 state (Fig.…”

Section: B Ytterbium Chalcogenide Spinelsmentioning

confidence: 93%

“…Spontaneous muon precession is observed in CdYb 2 X 4 [64] but not in MgYb 2 S 4 [62], suggesting that a different ground state might be found in the Mg analogs, or they may have stronger disorder. Within the ordered state, gapless spin excitations are observed in both electron spin resonance measurements [65] and heat capacity [62]. It is interesting to note that there are several order-by-disorder mechanisms through which the Γ 5 degeneracy can be lifted, which would open a small energy gap that as of now has not been detected [66].…”

Section: B Ytterbium Chalcogenide Spinelsmentioning

confidence: 97%

Frustrated Magnetism in Fluoride and Chalcogenide Pyrochlore Lattice Materials

Reig-i-Plessis,

Hallas

2020

Preprint

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Pyrochlore lattices, which are found in two important classes of materials -the A2B2X7 pyrochlore family and the AB2X4 spinel family -are the quintessential 3-dimensional frustrated lattice architecture. While historically oxides (X = O) have played the starring role in this field, the past decade has seen material's synthesis breakthroughs that have lead to the emergence of fluoride (X = F) and chalcogenide (X = S, Se) pyrochlore lattice materials. In this Research Update, we summarize recent progress in understanding the magnetically frustrated ground states in three families of non-oxide pyrochlore lattice materials: (i) 3d-transition metal fluoride pyrochlores, (ii) rare earth chalcogenide spinels, and (iii) chromium chalcogenide spinels with a breathing pyrochlore lattice. We highlight how the change of anion may modify the single ion spin anisotropy due to crystal electric field effects, stabilize new magnetic atom combinations, or dramatically alter the exchange pathways and thereby lead to new magnetic ground states. We also consider a slate of future directions -materials with the potential to define the next decade of research in frustrated magnetism.

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High-Field Multi-Frequency ESR in the Rare-Earth Spinel Compound CdYb2S4

Cited by 6 publications

References 10 publications

Frustrated magnetism in the Heisenberg pyrochlore antiferromagnets $A$Yb$_2$$X$$_4$ ($A$ = Cd, Mg, $X$ = S, Se)

Frustrated magnetism in the Heisenberg pyrochlore antiferromagnets $A$Yb$_2$$X$$_4$ ($A$ = Cd, Mg, $X$ = S, Se)

Frustration and anisotropic exchange in ytterbium magnets with edge-shared octahedra

Frustrated Magnetism in Fluoride and Chalcogenide Pyrochlore Lattice Materials

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