Irreversibility crossover in a Cu:Mn spin glass in high magnetic fields: Evidence for the Gabay-Toulouse transition

Kenning, G. G.; Chu, Dongliang; Orbach, Raymond Lee

doi:10.1103/physrevlett.66.2923

Cited by 107 publications

(66 citation statements)

References 18 publications

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“…Mean-field calculations have predicted that when anisotropic interactions are present, an otherwise Heisenberg spin-glass exhibits an Ising-like behavior in the low-field limit [76,77]. This has been verified experimentally in spin glasses of diverse chemical nature, ranging from the archetype metallic Ruderman-Kittel-Kasuya-Yosida (RKKY) CuMn [78] system to short-range interacting, insulating CdCr 1.7 In 0.3 S 4 [79] and semiconducting Cd 0.62 Mn 0.38 Te [80] compounds. The present experimental data in Na-birnessite could suggest that anisotropic interactions should be taken into account, but on the other hand, can also imply that such conventional experiments may not be sufficiently sensitive [75] to the freezing of transverse spin degrees of freedom that are identifying features of Heisenberg spin glasses, consistent with a transition line of the GT type.…”

Section: F Field-dependence Of Magnetic Susceptibilitymentioning

confidence: 92%

Hydration-induced spin-glass state in a frustrated Na-Mn-O triangular lattice

et al. 2016

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Birnessite compounds are stable across a wide range of compositions that produces a remarkable diversity in their physical, electrochemical and functional properties. These are hydrated analogues of the magnetically frustrated, mixed-valent manganese oxide structures, with general formula, Na x MnO 2 . Here we demonstrate that the direct hydration of layered rock-salt type α-NaMnO 2 , with the geometrically frustrated triangular lattice topology, yields the birnessite type oxide, Na 0.36 MnO 2 ·0.2H 2 O, transforming its magnetic properties. This compound has a muchexpanded interlayer spacing compared to its parent α-NaMnO 2 compound. We show that while the parent α-NaMnO 2 possesses a Néel temperature of 45 K as a result of broken symmetry in the Mn 3+ sub-lattice, the hydrated derivative undergoes collective spin-freezing at 29 K within the Mn 3+ /Mn 4+ sub-lattice. Scaling-law analysis of the frequency dispersion of the AC susceptibility, as well as the temperature-dependent, low-field DC magnetization confirm a cooperative spin-glass state of strongly interacting spins. This is supported by complementary 2 spectroscopic analysis (HAADF-STEM, EDS, EELS) as well as by a structural investigation (high-resolution TEM, X-ray and neutron powder diffraction) that yield insights into the chemical and atomic structure modifications. We conclude that the spin-glass state in birnessite is driven by the spin-frustration imposed by the underlying triangular lattice topology that is further enhanced by the in-plane bond-disorder generated by the mixed-valent character of manganese in the layers.

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Section: F Field-dependence Of Magnetic Susceptibilitymentioning

confidence: 92%

Hydration-induced spin-glass state in a frustrated Na-Mn-O triangular lattice

et al. 2016

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“…6 The experimental evidence for an AT-type critical behavior appears ambiguous. Many real spin glasses have mean-field-like phase diagrams, 8 with an onset of strong M F C − ZF C irreversibility along a certain line. This irreversibility is usually interpreted as a sign of replicasymmetry breaking.…”

Section: Introductionmentioning

confidence: 99%

From linear to nonlinear response in spin glasses: Importance of mean-field-theory predictions

2002

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Deviations from spin-glass linear response in a single crystal Cu:Mn 1.5 at % are studied for a wide range of changes in magnetic field, ∆H. Three quantities, the difference T RM − (M F C − ZF C), the effective waiting time, t eff w , and the difference T RM (tw) − T RM (tw = 0) are examined in our analysis. Three regimes of spin-glass behavior are observed as ∆H increases. Lines in the (T, ∆H) plane, corresponding to "weak" and "strong" violations of linear response under a change in magnetic field, are shown to have the same functional form as the de Almeida-Thouless critical line. Our results demonstrate the existence of a fundamental link between static and dynamic properties of spin glasses, predicted by the mean-field theory of aging phenomena.

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“…Ref. 65) ). A detailed comparison on the low anisotropy CuM n shows that at a given relative temperature even the "weak" irreversibility onset lies at a field significantly lower than that for the onset of a torque signal.…”

Section: Torque Measurements and In-field Transitionsmentioning

confidence: 99%

Heisenberg Spin Glass Experiments and the Chiral Ordering Scenario

Campbell

Petit

2010

J. Phys. Soc. Jpn.

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An overview is given of experimental data on Heisenberg Spin Glass materials so as to make detailed comparisons with numerical results on model Heisenberg spin glasses, with particular reference to the chiral driven ordering transition scenario due to Kawamura and collaborators. On weak anisotropy systems, experiments show critical exponents which are very similar to those estimated numerically for the model Heisenberg chiral ordering transition but which are quite different from those at Ising spin glass transitions. Again on weak anisotropy Heisenberg spin glasses, experimental torque data show well defined in-field transverse ordering transitions up to strong applied fields, in contrast to Ising spin glasses where fields destroy ordering. When samples with stronger anisotropies are studied, critical and in-field behavior tend progressively towards the Ising limit. It can be concluded that the essential physics of laboratory Heisenberg spin glasses mirrors that of model Heisenberg spin glasses, where chiral ordering has been demonstrated numerically.

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Irreversibility crossover in a Cu:Mn spin glass in high magnetic fields: Evidence for the Gabay-Toulouse transition

Cited by 107 publications

References 18 publications

Hydration-induced spin-glass state in a frustrated Na-Mn-O triangular lattice

Hydration-induced spin-glass state in a frustrated Na-Mn-O triangular lattice

From linear to nonlinear response in spin glasses: Importance of mean-field-theory predictions

Heisenberg Spin Glass Experiments and the Chiral Ordering Scenario

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