Deciphering structural and magnetic disorder in the chiral skyrmion host materials 
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Bocarsly, Joshua D.; Heikes, Colin; Brown, Craig M.; Wilson, Stephen D.; Seshadri, Ram

doi:10.1103/physrevmaterials.3.014402

Cited by 46 publications

(49 citation statements)

References 56 publications

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“…1(b) and 1(c). Note that there were several previous studies on crystal structures of CZM compounds with relatively low Mn concentration [21,26] which also reported that the Mn atoms mainly prefer the 12d sites. The present results show good agreement with them in the low-x region and reveal the site occupancies in the whole range of x.…”

Section: B X Dependence Of the Site Occupancies And The Average Scatmentioning

confidence: 92%

“…The antiferromagnetic Mn-Mn interactions on the triangular network may lead to geometrical spin frustration, which could also contribute to the emergence of the spin-glass state. Actually, a recent study on CZM with relatively low Mn concentrations (up to x = 6) [26] reported that the magnetic moments in the 8c and 12d sublattices show different temperature evolutions; the net magnetic moment in the 12d sites is significantly reduced at low temperature, implying that the Mn moments on the 12d sites are disordered at low temperatures. However, the present results revealed that the frustrated 12d sublattice is mostly occupied by nonmagnetic Zn in the low-x region and that the reentrant spin-glass state becomes pronounced above x = 4, where the Mn atoms start occupying the 8c sites.…”

Section: Correlation Between the Site Occupancies And The Spin-glamentioning

confidence: 99%

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Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2
Nakajima
¹
,
Karube
²
,
Ishikawa
³

et al. 2019
Phys. Rev. B
30
1
20
0
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Ternary alloys Co-Zn-Mn with β-Mn-type structure exhibit helimagnetic order and skyrmion lattice states in a low-Mn-concentration region. Recent studies on Co 10− x 2 Zn 10− x 2 Mn x (CZM) revealed that the magnetic modulation period and the paramagnetic-to-helimagnetic transition temperature are reduced with increasing Mn concentration x [Tokunaga et al., Nat. Commun. 6, 7638 (2015)] and that the helimagnetic order is replaced with a spin-glass state in a high-x region [Karube et al., Sci. Adv. 4, eaar7043 (2018)]. To understand the microscopic mechanism of the Mn substitution effect, we have performed crystal structure analyses of a series of CZM samples with x = 4, 5, 6, 7, 8, 10, 12, and 16 by neutron powder diffraction. We present a model for the site occupancies of Co, Zn, and Mn in the unit cell, which has two independent crystallographic sites, specifically 8c and 12d sites. Zn atoms are always accommodated in the 12d sites, and Co atoms prefer the 8c sites, although some of them also exist in the 12d sites in a low-x region. Mn atoms mainly prefer the 12d sites but also share the 8c site with Co atoms in the region of x 4. A comparison between the site occupancies and the x-T magnetic phase diagram suggests that the amount of Mn in the 8c sites is relevant to the emergence of the spin-glass state.

show abstract

Section: B X Dependence Of the Site Occupancies And The Average Scatmentioning

confidence: 92%

Section: Correlation Between the Site Occupancies And The Spin-glamentioning

confidence: 99%

Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2
Nakajima
¹
,
Karube
²
,
Ishikawa
³

et al. 2019
Phys. Rev. B
30
1
20
0
View full text Add to dashboard Cite

show abstract

“…However, in some cases more exotic local magnetic structures have been found to interact in interesting ways with long-period skyrmionic order. For example, this occurs in the multiferroic ferrimagnet Cu 2 OSeO 3 [43], the ferrimagnetic antiskyrmion host Mn 1.4 Pt 0.9 Pd 0.1 Sn [44], compensated ferrimagnetic films of GdCo [45], and in the spin-glass state of Co x Zn y Mn z [46,47]. We are not aware of any so-far-reported skyrmion hosts in which the local magnetic structure involves a shorter-period incommensurate spin wave.…”

Section: Magnetic Structurementioning

confidence: 98%

Evolution of noncollinear magnetism in magnetocaloric MnPtGa

Cooley

Bocarsly

Schueller

et al. 2020

Phys. Rev. Materials

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MnPtGa crystallizes in the hexagonal Ni2In structure type in space group P 63/mmc, and has been reported to display a ferromagnetic Curie temperature near 220 K. Here we find a transition near TC = 236 K to a ferromagnetic state, albeit with a reduced moment from what is expected for collinear ordering. The peak magnetocaloric entropy change was determined to be ∆SM = −1.9 J kg −1 K −1 for an applied magnetic field of H = 5 T at the ferromagnetic ordering temperature. Magnetostructural coupling manifests as a change in the slope of the thermal expansion coefficients of the c lattice parameter near TC , with a negative spontaneous volume magnetostriction; ω = −300 ppm at 190 K. Neutron powder diffraction studies of the magnetic ground state reveal an evolution in complexity as temperature decreases: from a ferromagnet, to a canted antiferromagnet, to the eventual formation of a spin-density wave state at low temperatures.

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“…Some members of the Co x Zn y Mn 20−x−y series host a SkL at or above room temperature, making the series potentially favorable for future applications. However, crystallographic site disorder inherent in these materials presents challenges, such as the broadening, both in temperature and applied field, of the magnetic transitions due to locally different crystallographic environments throughout the sample, and dramatic effects on T c with relatively subtle changes in composition [58]. By studying these three materials we can consider the effect of increasing site disorder (which mainly occurs on the 12d Wyckoff site) on the magnetism.…”

Section: B Co X Zn Y Mn 20−x−ymentioning

confidence: 99%

Megahertz dynamics in skyrmion systems probed with muon-spin relaxation

et al. 2021

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We present longitudinal-field muon-spin relaxation (LF μSR) measurements on two systems that stabilize a skyrmion lattice (SkL): Cu 2 OSeO 3 , and Co x Zn y Mn 20−x−y for (x, y) = (10, 10), (8, 9), and (8, 8). We find that the SkL phase of Cu 2 OSeO 3 exhibits emergent dynamic behavior at megahertz frequencies, likely due to collective excitations, allowing the SkL to be identified from the μSR response. From measurements following different cooling protocols and calculations of the muon stopping site, we suggest that the metastable SkL is not the majority phase throughout the bulk of this material at the fields and temperatures where it is often observed. The dynamics of bulk Co 8 Zn 9 Mn 3 are well described by 2 GHz excitations that reduce in frequency near the critical temperature, while in Co 8 Zn 8 Mn 4 we observe similar behavior over a wide range of temperatures, implying that dynamics of this kind persist beyond the SkL phase.

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Deciphering structural and magnetic disorder in the chiral skyrmion host materials CoxZnyMnz ( x+y+z

Cited by 46 publications

References 56 publications

Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2
Nakajima
¹
,
Karube
²
,
Ishikawa
³

et al. 2019
Phys. Rev. B
30
1
20
0
View full text Add to dashboard Cite

Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2
Nakajima
¹
,
Karube
²
,
Ishikawa
³

et al. 2019
Phys. Rev. B
30
1
20
0
View full text Add to dashboard Cite

Evolution of noncollinear magnetism in magnetocaloric MnPtGa

Megahertz dynamics in skyrmion systems probed with muon-spin relaxation

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Deciphering structural and magnetic disorder in the chiral skyrmion host materials CoxZnyMnz ( x+y+z

Cited by 46 publications

References 56 publications

Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2Nakajima1, Karube2, Ishikawa3 et al. 2019Phys. Rev. B301200View full textAdd to dashboardCite

Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2Nakajima1, Karube2, Ishikawa3 et al. 2019Phys. Rev. B301200View full textAdd to dashboardCite

Evolution of noncollinear magnetism in magnetocaloric MnPtGa

Megahertz dynamics in skyrmion systems probed with muon-spin relaxation

Contact Info

Product

Resources

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Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2
Nakajima
¹
,
Karube
²
,
Ishikawa
³

et al. 2019
Phys. Rev. B
30
1
20
0
View full text Add to dashboard Cite

Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2
Nakajima
¹
,
Karube
²
,
Ishikawa
³

et al. 2019
Phys. Rev. B
30
1
20
0
View full text Add to dashboard Cite