Fluctuation-induced interactions and the spin-glass transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>TiO</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>

LaBarre, P. G.; Phelan, Daniel; Xin, Yan; Ye, Feng; Besara, Tiglet; Siegrist, T.; Syzranov, Sergey; Rosenkranz, Stephan; Ramirez, A. P.

doi:10.1103/physrevb.103.l220404

Cited by 5 publications

(10 citation statements)

References 22 publications

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“…Also, since techniques for atom identification in the solid state, such as energy dispersive atomic spectroscopy, possess systematic uncertainty in ratios between constituent atoms, we rely here on the susceptibility itself to determine the concentration of Fe in each sample. This approach relies on our previously reported measurement of χ (T) in Fe 2 TiO 5 for temperatures between 400 K and 900 K, which yielded an effective moment of µ eff = 6.12 ± 0.05 µ B , in reasonable agreement with the value µ eff = 5.92 µ B expected for a free S = 5/2 ion [2]. Since the most concentrated compound of the series yielded an effective moment close to the theoretical value, it is reasonable to expect that the effective moment in more dilute compounds will be identical since the chemical environment and oxidation states are the same.…”

Section: Methodssupporting

confidence: 65%

“…Thus, it is also likely impossible to describe the complete anisotropy in its SG response using atomic spins as the freezing degree of freedom. Recently we revisited this problem and showed, using neutron scattering, that the Fe spins develop nano-sized regions of antiferromagnetic (AF) order where the spins are either aligned or antialigned with the long direction, parallel to the a-axis [2]. These regions take the shape of surfboards with correlations lengths with the a-axis, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The oxygen atoms on the left part of the unit cell are omitted to better show the double corrugated spin chains as indicated by the dashed lines. The shaded area represents a cross-section of the mesoscopic surfboard (top) that extends along the a-axis, as determined in [2]. (b) Magnetic ac susceptibility along the c-axis were measured on (Fe 1−p Gap) 2 TiO 5 compounds with p = 0, 0.11 and 0.42.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of magnetic surfboards and spin glass behavior in (Fe_1−pGa _p )₂TiO₅

Li,

Phelan,

et al. 2023

J. Phys.: Condens. Matter

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The unusual anisotropy of the spin glass transition in the pseudobrookite system Fe2TiO5 has been interpreted as arising from an induced, van der Waals-like, interaction among magnetic clusters. Here we present susceptibility (χ) and specific heat data (C) for Fe2TiO5 diluted with non-magnetic Ga, (Fe1-pGap)2TiO5, for disorder parameter p = 0, 0.11, and 0.42, and elastic neutron scattering data for p = 0.20. A uniform suppression of Tg is observed upon increasing p, along with a value of χ(Tg) that increases as Tg decreases, i.e. dχ(Tg)/dTg< 0. We also observe CT∝T2 in the low temperature limit. The observed behavior places (Fe1-pGap)2TiO5 in the category of a strongly geometrically frustrated spin glass.

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Section: Methodssupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolution of magnetic surfboards and spin glass behavior in (Fe_1−pGa _p )₂TiO₅

Li,

Phelan,

et al. 2023

J. Phys.: Condens. Matter

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“…In the lower panels of Fig. 1 we show the dimensionless χ ( T g ) vs. T g , using all available experimental data for families of compounds with variable disorder 5 , 9 , 18 – 30 (details on methodology are provided in the SI). We emphasise that, since different reviewed compounds have different microscopic sources of quenched disorder (to which impurity atoms contribute but of which they may not be the only source), the observed trends in the behaviour of χ ( T g ) vs. T g are universal.…”

Section: Resultsmentioning

confidence: 99%

“…A naïve explanation for the hidden energy scale in GF systems is the presence of non-vacancy sources of quenched disorder, such as random strain in Y 2 Mo 2 O 7 , that could drive the glass transition in the zero-vacancy limit. However, the hidden energy scale has the same order of magnitude, , in all GF compounds (with the exception of Fe 3−3x Ga 3x−1 TiO 5 , in which and the transition is apparently dominated by clusters of ~30 Fe 3+ spins rather than by single-vacancy spins 30 ) Since the other compounds do not have significant known sources of disorder distinct from vacancies, this magnitude of the hidden energy scale requires an explanation.…”

Section: Discussionmentioning

confidence: 96%

Eminuscent phase in frustrated magnets: a challenge to quantum spin liquids

Syzranov

Ramirez

2022

Nat Commun

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A geometrically frustrated (GF) magnet consists of localised magnetic moments, spins, whose orientation cannot be arranged to simultaneously minimise their interaction energies. Such materials may host novel fascinating phases of matter, such as fluid-like states called quantum spin-liquids. GF magnets have, like all solid-state systems, randomly located impurities whose magnetic moments may “freeze” at low temperatures, making the system enter a spin-glass state. We analyse the available data for spin-glass transitions in GF materials and find a surprising trend: the glass-transition temperature grows with decreasing impurity concentration and reaches a finite value in the impurity-free limit at a previously unidentified, “hidden”, energy scale. We propose a scenario in which the interplay of interactions and entropy leads to a crossover in the permeability of the medium that assists glass freezing at low temperatures. This low-temperature, “eminuscent”, phase may obscure or even destroy the widely-sought spin-liquid states in rather clean systems.

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Polyamorphism gets a magnetic boost

Eremenko,

Saxena,

Sirenko

et al. 2024

Low Temperature Physics

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Four decades since the concept of polyamorphism was introduced by [L. S. Palatnik (1909–1994), Fiz. Nizk. Temp. 25, 400 (1909)], numerous investigations proved its presence in a broad variety of nonmagnetic short-range ordered materials, like structural, metallic, a-metallic, inorganic molecule, orientational, electron glasses, water, ice, carbons, and others. It was manifested by phase transitions between amorphous states as a function of the quench condition and under compression, mediated by long-wave fluctuations of an order parameter. There has been much recent discussion given to the phenomenon of polyamorphism where distinct, different states of amorphous liquids and solids are observed as a function of density. The outstanding contribution of the recently late [A. Sella, et al. (1956–2022), Nat. Mater. 21, 490 (2022)],2 in the field should be recognized here. Underlying this phenomenon is the possibility of a first-order liquid-liquid phase transition driven by the density and entropy differences between the two amorphous phases. Magnetic boost of multilayer graphene under pressure was also recently discovered. Their famous spin counterparts, such as spin liquid, spin ice, and spin glass have been less studied at this end despite numerous similarities, registered so far. Taking that in mind, for further polyamorphism platform development, we demonstrate the signatures of phase transition in spin glass, driven by a magnetic field, and eventually, a novel type of polyamorphism, the spin-glass one.

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Fluctuation-induced interactions and the spin-glass transition inFe2TiO5

Cited by 5 publications

References 22 publications

Evolution of magnetic surfboards and spin glass behavior in (Fe_1−pGa _p )₂TiO₅

Evolution of magnetic surfboards and spin glass behavior in (Fe_1−pGa _p )₂TiO₅

Eminuscent phase in frustrated magnets: a challenge to quantum spin liquids

Polyamorphism gets a magnetic boost

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Fluctuation-induced interactions and the spin-glass transition inFe2TiO5

Cited by 5 publications

References 22 publications

Evolution of magnetic surfboards and spin glass behavior in (Fe1−p Ga p )2TiO5

Evolution of magnetic surfboards and spin glass behavior in (Fe1−p Ga p )2TiO5

Eminuscent phase in frustrated magnets: a challenge to quantum spin liquids

Polyamorphism gets a magnetic boost

Contact Info

Product

Resources

About

Evolution of magnetic surfboards and spin glass behavior in (Fe_1−pGa _p )₂TiO₅

Evolution of magnetic surfboards and spin glass behavior in (Fe_1−pGa _p )₂TiO₅