Neutron spin echo study of dynamic correlations near the liquid-glass transition

Mezei, F.; Knaak, W.; Faragó, B.

doi:10.1103/physrevlett.58.571

Cited by 363 publications

(132 citation statements)

References 14 publications

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“…This implies that the relaxation stretches over several orders of magnitude in time and involves a broad distribution of relaxation times. The corresponding stretching exponents are close to the values found in disordered systems such as glass-forming systems [47,48]. In addition, the associated characteristic relaxation times at zero field for Fe 0.7 Co 0.3 Si can be as long as 10 ns, and are therefore much longer than for MnSi where they do not exceed 1 ns [21,40].…”

Section: B Comparison With Mnsi and Other Cubic Helimagnetssupporting

confidence: 81%

Universality of the helimagnetic transition in cubic chiral magnets: Small angle neutron scattering and neutron spin echo spectroscopy studies of FeCoSi

et al. 2017

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Universality of the helimagnetic transition in cubic chiral magnets: Small angle neutron scattering and neutron spin echo spectroscopy studies of FeCoSi CopyrightOther than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons. Takedown policyPlease contact us and provide details if you believe this document breaches copyrights. We will remove access to the work immediately and investigate your claim. We present a comprehensive small angle neutron scattering and neutron spin echo spectroscopy study of the structural and dynamical aspects of the helimagnetic transition in Fe 1−x Co x Si with x = 0.30. In contrast to the sharp transition observed in the archetype chiral magnet MnSi, the transition in Fe 1−x Co x Si is gradual, and long-range helimagnetic ordering coexists with short-range correlations over a wide temperature range. The dynamics are more complex than in MnSi and involve long relaxation times with a stretched exponential relaxation which persists even under magnetic field. These results in conjunction with an analysis of the hierarchy of the relevant length scales show that the helimagnetic transition in Fe 1−x Co x Si differs substantially from the transition in MnSi and question the validity of a universal approach to the helimagnetic transition in chiral magnets.

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Section: B Comparison With Mnsi and Other Cubic Helimagnetssupporting

confidence: 81%

Universality of the helimagnetic transition in cubic chiral magnets: Small angle neutron scattering and neutron spin echo spectroscopy studies of FeCoSi

et al. 2017

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“…Below T c , a third regime appears, the so-called ␤ regime, which is first seen as a shoulder and saturates at a finite value below T g . This nonergodicity has been seen in many experimental measurements [3][4][5][6] and computer simulations [7][8][9][10] on different types of materials ranging from the fragile polymeric glasses to strong glasses, such as SiO 2 . In this paper we want to go a step further.…”

Section: Introductionmentioning

confidence: 75%

Structure and relaxation in liquid and amorphous selenium

Caprion

Schober

2000

Phys. Rev. B

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We report a molecular dynamics simulation of selenium, described by a three-body interaction. The temperatures T g and T c and the structural properties are in agreement with experiment. The mean nearest neighbor coordination number is 2.1. A small prepeak at about 1 Å Ϫ1 can be explained in terms of void correlations. In the intermediate self-scattering function, i.e., the density fluctuation correlation, classical behavior, ␣ and ␤ regimes, is found. We also observe the plateau in the ␤ regime below T g . In a second step, we investigated the heterogeneous and/or homogeneous behavior of the relaxations. At both short and long times the relaxations are homogeneous ͑or weakly heterogeneous͒. In the intermediate time scale, lowering the temperature increases the heterogeneity. We connect these different domains to the vibrational ͑ballistic͒, ␤ and ␣ regimes. We have also shown that the increase in heterogeneity can be understood in terms of relaxations.

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“…Additionally, it can be formally defined within the framework of statistical mechanics, allowing for detailed comparisons between experiment, theory [7] and simulation [8]. Access to the density correlation function is therefore fundamental for describing the dynamical behavior of glasses and achieving a consistent picture of structural relaxation on microscopic length scales.X-ray photon correlation spectroscopy (XPCS) has recently emerged as a novel technique for studying the microscopic dynamics of condensed matter [6,[9][10][11]. In XPCS, coherent beams of X-rays are scattered from a sample and the resulting fluctuations in intensity correlated over time.…”

mentioning

confidence: 99%

“…These structural rearrangements are directly related to how fast microscopic density fluctuations in the system decay [5]. The physical quantity describing this is the density correlation function, which can be measured over a wide range of time scales using a variety of complimentary experimental techniques [6]. Additionally, it can be formally defined within the framework of statistical mechanics, allowing for detailed comparisons between experiment, theory [7] and simulation [8].…”

mentioning

confidence: 99%

X-Ray Photon Correlation Spectroscopy Reveals Intermittent Aging Dynamics in a Metallic Glass

et al. 2015

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We use coherent X-rays to probe the aging dynamics of a metallic glass directly on the atomic level. Contrary to the common assumption of a steady slowing down of the dynamics usually observed in macroscopic studies, we show that the structural relaxation processes underlying aging in this metallic glass are intermittent and highly heterogeneous at the atomic scale. Moreover, physical aging is triggered by cooperative atomic rearrangements, driven by the relaxation of internal stresses. The rich diversity of this behavior reflects a complex energy landscape, giving rise to a unique type of glassy-state dynamics.Physical aging is not only of scientific interest [1,2] but also of great practical importance, as the performance stability of many technologically relevant amorphous materials such as oxide glasses, polymers and metallic glasses (MGs) depends on how aging affects their properties during the expected service life. For MGs in particular, aging can result in severe embrittlement [3] and bring about profound changes to fracture and fatigue properties [4]. Therefore, the ability to understand and characterize the micromechanisms of aging in MGs will play a central role in ensuring their success in a broad range of industrial and commercial applications.A key to understanding aging on the microscopic level is measuring the time scale on which the system rearranges its internal structure. These structural rearrangements are directly related to how fast microscopic density fluctuations in the system decay [5]. The physical quantity describing this is the density correlation function, which can be measured over a wide range of time scales using a variety of complimentary experimental techniques [6]. Additionally, it can be formally defined within the framework of statistical mechanics, allowing for detailed comparisons between experiment, theory [7] and simulation [8]. Access to the density correlation function is therefore fundamental for describing the dynamical behavior of glasses and achieving a consistent picture of structural relaxation on microscopic length scales.X-ray photon correlation spectroscopy (XPCS) has recently emerged as a novel technique for studying the microscopic dynamics of condensed matter [6,[9][10][11]. In XPCS, coherent beams of X-rays are scattered from a sample and the resulting fluctuations in intensity correlated over time. This enables measurement of the density correlation function on the atomic scale. of a unique stress-dominated dynamics characterized by subsequent aging regimes: a fast exponential growth for short waiting times, followed by a long, almost stationary regime. The latter has been observed also in network glasses [13] and is contrary to the steady slowing down of the dynamics during aging observed in macroscopic studies.Here, we investigate the atomic motion in a Pd 43 Cu 27 Ni 10 P 20 MG ribbon using XPCS and show that this system ages in a highly heterogeneous manner, consisting of quiescent periods of stationary dynamics interspersed with cooperative, avalanch...

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Neutron spin echo study of dynamic correlations near the liquid-glass transition

Cited by 363 publications

References 14 publications

Universality of the helimagnetic transition in cubic chiral magnets: Small angle neutron scattering and neutron spin echo spectroscopy studies of FeCoSi

Universality of the helimagnetic transition in cubic chiral magnets: Small angle neutron scattering and neutron spin echo spectroscopy studies of FeCoSi

Structure and relaxation in liquid and amorphous selenium

X-Ray Photon Correlation Spectroscopy Reveals Intermittent Aging Dynamics in a Metallic Glass

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