The existence of a 'crossover region' in glass-forming liquids has long been considered as a general phenomenon that is as important as the glass transition. One potential origin for the crossover behavior is a liquid-to-liquid phase transition (LLPT). Although a LLPT is thought to exist in all forms of liquids, structural evidence for this, particularly in supercooled liquids, is scarce, elusive, and in many cases controversial. A key challenge to the search for a LLPT in a supercooled liquid is the interference of crystallization during cooling. Crystallization induces major structural changes, which can overwhelm and therefore mask the more subtle changes associated with a LLPT. Here, we report the results of an in-situ containerless synchrotron study of a metallic-glass-forming liquid (Zr57Nb5Al10Cu15.4Ni12.6) that show distinct changes in the liquid structure at ~1000 K, a temperature well below the melting temperature of the liquid and 150 K above the crystallization temperature. The structural transition is characterized by growing short- and extended-range order below the transition temperature, and is accompanied by a concurrent change in density. These data provide strong evidence for a LLPT in the supercooled metallic liquid, particularly in the light of a recent computer simulation study. That a LLPT is found in a metallic liquid supports the increasingly widely held view that a LLPT may be a common feature of a variety of liquids.
Shear accelerated crystallization in a supercooled atomic liquid
通过压缩短棒使形成大块金属玻璃的合金在其过冷状态下经受剪切流动以产生扁平圆盘。所得材料在等温退火期间表现出增强的结晶动力学，这反映在相对于未变形的情况结晶时间的减少。从静态到剪切加速结晶的转变与在高于临界剪切速率$\dotγ_c\approx 0.3$ s $^{-1}$的剪切流动期间积累的应变有关，所述临界剪切速率$\dotγ_c\approx 0.3$ s $^{-1}$对应于Péclet数，$Pe\sim\mathcal{O}(1)$。在中等剪切速率下观察到原子系统中的剪切加速结晶是不常见的。这在此是由于过冷液体的显著粘度而成为可能的，该过冷液体在接近玻璃化转变时随温度强烈增加。因此，我们可以预期遇到的非平凡的剪切相关的影响，在热塑性变形的类似系统。
From metallic glasses to nanocrystals: Molecular dynamics simulations on the crossover from glass-like to grain-boundary-mediated deformation behaviour
Barrier Softening near the onset of Non-Activated Transport in Supercooled Liquids: Implications for Establishing Detailed Connection between Thermodynamic and Kinetic Anomalies in Supercooled Liquids
Break-down of the relationship between α-relaxation and equilibration in hydrostatically compressed metallic glasses
Institut Néel, Université Grenoble Alpes and Centre National de la Recherche Scientifique（格勒诺布尔阿尔卑斯大学内尔研究所与法国国家科学研究中心）；Institut Lumière Matière UMR CNRS 5306, Université Claude Bernard Lyon 1, CNRS（里昂第一大学克劳德·贝尔纳物质光研究所（CNRS联合研究单位5306））；European Synchrotron Radiation Facility（欧洲同步辐射装置）；Chair of Metallic Materials, Saarland University（萨尔兰大学金属材料系）；Department of physics, Institute of Energy Technologies, Universitat Politècnica de Catalunya- BarcelonaTech（加泰罗尼亚理工大学能源技术学院物理系）；Donostia International Physics Center（圣塞巴斯蒂安国际物理中心）；Centro de Física de Materiales (CSIC–UPV/EHU)（材料物理中心（西班牙高等科研理事会-巴斯克国立大学））；Chair of Metallic Materials, Berlin Institute of Technology (TU-Berlin)（柏林工业大学金属材料系）；Laboratoire Magmas et Volcans CNRS, IRD, OPGC, Université Clermont Auvergne（克莱蒙奥弗涅大学火山与岩浆实验室（CNRS、IRD、OPGC联合实验室））
On the role of Sm in solidification of Al-Sm metallic glasses
在Al-Sm金属玻璃凝固过程中，过冷液体原子结构随Sm浓度的增加而逐渐演化为类二十面体团簇。与液体中剩余的团簇相比，这些团簇表现出较慢的动力学，导致增强的无定形相稳定性和玻璃形成能力（GFA）。最大的二十面体排序和原子堆积密度已被发现的Al 90 Sm 10和Al 85 Sm 15合金，分别，而最小的结合能已被发现的Al 93 Sm 7这是一致的组合物的范围内（从Al 92 Sm 8到Al 84 Sm 16）实验发现具有高GFA。
Non-Monotonic Dynamical Correlations Across The Glass Crossover
Eindhoven University of Technology（埃因霍温理工大学）；Institute for Complex Molecular Systems, Eindhoven University of Technology（埃因霍温理工大学复杂分子系统研究所）；Deutsches Zentrum für Luftund Raumfahrt (DLR)（德国航空航天中心）；Heinrich-Heine-Universität Düsseldorf（杜塞尔多夫大学）；Institute of Complex Systems (ISC) - CNR, Rome unit（罗马复杂系统研究所（国家研究委员会））；Sapienza Università di Roma（罗马第一大学）；Istituto Nazionale di Fisica Nucleare, Sezione di Roma I（意大利国家核物理研究所罗马一分部）
Transmutation-accelerated sampling method for multi-component ZrCu(Al) metallic glasses
NOMATEN Centre of Excellence, National Center for Nuclear Research（NOMATEN卓越中心，国家核研究中心）；Univ. Lyon, INSA-Lyon, CNRS, LaMCoS, UMR 5259（里昂大学，里昂国立应用科学学院，法国国家科学研究中心，LaMCoS实验室）；Laboratoire de Mécanique des Solides, CNRS, Ecole Polytechnique（固体力学实验室，法国国家科学研究中心，巴黎综合理工学院）；Aalto University（阿尔托大学）
Slater to Mott crossover in the metal to insulator transition of Nd2Ir2O7
我们提出了一个角度分辨的光电子能谱研究的三维烧绿石铱酸盐Nd 2 Ir 2 O 7通过其磁性金属-绝缘体转变的电子结构。我们的数据表明，金属Nd 2 Ir 2 O 7有一个二次带，接触费米能级在伽马点，类似于Pr 2 Ir 2 O 7。因此，费米节点状态是烧绿石铱酸盐的金属相的共同特征。当冷却到转变温度以下时，该化合物表现出带隙开口，具有像带隙绝缘体的准粒子峰的能量偏移。然而，随着温度的进一步降低，准粒子峰被强烈抑制，并最终在最低温度下消失，留下缺乏长寿命电子的非色散平坦带。因此，我们确定了一个显着的交叉从斯莱特到莫特绝缘体随着温度的降低。这些观察结果解释了这种材料中令人困惑的外尔点的缺失，尽管它接近于零温度金属-绝缘体转变。
