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A class of high-mobility layered nanomaterials by design

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Journal of Materials Science & Technology 2023年第33期164卷 179-187页

作者： Dmitry V.Averyanov Ivan S.Sokolov Oleg E.Parfenov Alexander N.Taldenkov Oleg A.Kondratev Andrey M.Tokmachev vyacheslav g.storchak National Research Center “Kurchatov Institute” Kurchatov Sq.1Moscow 123182Russia

Design of materials with particular functional properties is indispensable albeit very *** and structural analogies can be helpful in this endeavor,especially when a particular combination of properties is sought *** aim is to bundle together 3 characteristics:high carrier mobility,magnetism,and scalability to nanomaterials in the form of a film–such a combination is particularly advantageous for ***,inspired by recent studies of MAl_(2)Si_(2)and related compounds,we develop magnetic EuAl_(2)ge_(2)and non-magnetic SrAl_(2)ge_(2)nanomaterials with high carrier *** syntheses employing sacrificial 2D templates result in epitaxial films of MAl_(2)ge_(2)seamlessly integrated with *** syntheses are followed by a study of the atomic structure,magnetic and electron transport *** particular,the films demonstrate high carrier mobility,exceeding 10,000 cm^(2)V^(-1)s^(-1)in the case of EuAl_(2)ge_(2),making the materials appealing for *** together,MAl_(2)ge_(2)and MAl_(2)Si_(2)form a class of high-mobility layered nanomaterials.

关键词： High carrier mobility Magnetism SrAl_(2)ge_(2) EuAl_(2)ge_(2) germanium

Competing magnetic states in silicene and germanene 2D ferromagnets

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Nano Research 2020年第12期13卷 3396-3402页

作者： Dmitry V.Averyanov Ivan S.Sokolov Mikhail S.Platunov Fabrice Wilhelm Andrei Rogalev Pierluigi gargiani Manuel Valvidares Nicolas Jaouen Oleg E.Parfenov Alexander N.Taldenkov Igor A.Karateev Andrey M.Tokmachev vyacheslav g.storchak National Research Center“Kurchatov Institute” Kurchatov Sq.1Moscow123182Russia ESRF-The European Synchrotron CS 4022038043Grenoble Cedex 9France ALBA Synchrotron Light Source Cerdanyola del Vallès08290BarcelonaSpain L’Orme des Merisiers Synchrotron SOLEILGyf-sur-Yvette91192France

Two-dimension(2D)magnets have recently developed into a class of stoichiometric materials with prospective applications in ultra-compact spintronics and quantum *** functionality is particularly rich when different magnetic orders are competing in the same *** REX2(RE=Eu,gd;X=Si,ge),silicene or germanene—heavy counterparts of graphene—coupled with a layer of rare-earth metals,evolve from three-dimension(3D)antiferromagnets in multilayer structures to 2D ferromagnets in a few *** evolution,however,does not lead to fully saturated 2D ferromagnetism,pointing at a possibility of coexisting/competing magnetic ***,REX2 magnetism is explored with element-selective X-ray magnetic circular dichroism(XMCD).The measurements are carried out for gdSi2,EuSi2,gdge2,and Euge2 of different thicknesses down to 1 monolayer employing K absorption edges of Si and ge as well as M and L edges of the *** access the magnetic state in REX2 and determine the seat of magnetism,orbital,and spin contributions to the magnetic ***-field measurements probe remnants of the bulk antiferromagnetism in 2D *** results provide a new platform for studies of complex magnetic structures in 2D materials.

关键词： silicene germanene 2D ferromagnetism X-ray magnetic circular dichroism(XMCD) monolayer

Emerging 2D magnetic states in a graphene-based monolayer of EuC_(6)

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Nano Research 2022年第1期15卷 408-413页

作者： Ivan S.Sokolov Dmitry V.Averyanov Fabrice Wilhelm Andrei Rogalev Oleg E.Parfenov Alexander N.Taldenkov Igor A.Karateev Andrey M.Tokmachev vyacheslav g.storchak National Research Center“Kurchatov Institute” Kurchatov Sq.1Moscow 123182Russia ESRF-The European Synchrotron CS 4022038043 Grenoble Cedex 9France

Recent discoveries of intrinsic two-dimensional(2D)magnets open up vast opportunities to address fundamental problems in condensed matter physics,giving rise to applications from ultra-compact spintronics to quantum *** ever-growing material landscape of 2D magnets lacks,however,carbon-based systems,prominent in other areas of 2D *** measurements of the Eu/graphene compound-a monolayer of the EuC_(6) stoichiometry-reveal the emergence of 2D ferromagnetism but detailed studies of competing magnetic states are still ***,we employ element-selective X-ray absorption spectroscopy(XAS)and magnetic circular dichroism(XMCD)to establish the magnetic structure of monolayer *** system exhibits the anomalous Hall effect,negative magnetoresistance,and magnetization consistent with a ferromagnetic state but the saturation magnetic moment(about 2.5/%/Eu)is way too low for the half-filled f-shells of Eu^(2+)*** XAS/XMCD studies at the Eu L3 absorption edge probe the EuC6 magnetism in high fields and reveal the nature of the missing magnetic *** results are set against XMCD studies in Eu/silicene and Eu/germanene to establish monolayer EuC6 as a prominent member of the family of Eu-based 2D magnets combining the celebrated graphene properties with a strong magnetism of europium.

关键词： two-dimensional(2D)ferromagnetism graphene EuC_(6) X-ray magnetic circular dichroism(XMCD) monolayer

Evaluation of Long-Period Detectability of Teleseismic Events at Syowa Station, Antarctica

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International Journal of geosciences 2012年第4期3卷 809-821页

作者： Masaki Kanao Dmitry storchak Ben Dando International Seismological Centre Research Organization of Information and Systems

Phase identification procedures for teleseismic events at Syowa Station (69.0°S, 39.6°E;SYO), East Antarctica have been carried out since 1967 after the International geophysical Year (IgY;1957-1958). Since the development of INTELSAT telecommunication link, digital waveform data have been transmitted to the National Institute of Polar Research (NIPR) for the utilization of phase identification. Arrival times of teleseismic phases, P, PKP, PP, S, SKS have been detected manually and reported to the International Seismological Centre (ISC), and published by “JARE Data Reports” from NIPR. In this paper, hypocentral distribution and time variations for detected earthquakes are demonstrated over the last four decades in 1967-2010. Characteristics of detected events, magnitude dependency, spatial distributions, seasonal variations, together with classification by focal depth are investigated. Besides the natural increase in the occurrence of teleseismic events on the globe, a technical advance in the observing system and station infrastructure, as well as the improvement of procedures for reading seismic phases, could all combine to produce the increase in detection of events in last few decades. Variations in teleseismic detectability for longer terms may be possible by association with the meteorological environment and seaice spreading area around the Antarctic continent. Recorded teleseismic and local seismic signals have sufficient quality for many analyses on dynamics and structure of the Earth as viewed from Antarctica. The continuously recorded data are applied not only to lithospheric studies but also to the Earth’s deep interiors, as a significant contribution to the Federation of Digital Seismological Networks (FDSN) from high southern latitude.

关键词： Teleseismic Events Detectability Syowa Station Antarctica global Network

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国际地震中心改进的定位程序

世界地震译丛 2016年第5期47卷 377-401页

作者： Istvn Bondr Dmitry storchak 张莹莹中国地震台网中心

国际地震中心（ISC）是一个非政府的、非营利性机构,它的首要任务是产出权威的地球地震活动性报告.《国际地震中心公报》报道了50年（1960-2011年）的地震活动性.近年来由于全球台站日益增加,使得报告的地震事件尤其是事件的震相数量急... 详细信息

国际地震中心（ISC）是一个非政府的、非营利性机构,它的首要任务是产出权威的地球地震活动性报告.《国际地震中心公报》报道了50年（1960-2011年）的地震活动性.近年来由于全球台站日益增加,使得报告的地震事件尤其是事件的震相数量急剧增加.相似的射线路径会引起相关的走时预测误差,这些误差归因于：模型中没有加入地球非均匀性,这导致了对定位不确定性的低估和不利的台网几何结构以及定位偏差.因此,全球的台站分布越密集和越不均衡,大多数定位算法中所做出的假设（观测数据是独立的）越不成立.

关键词：地震中心定位程序国际地震活动性预测误差地震事件非营利性射线路径

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IASPEI标准地震震相表

世界地震译丛 2004年第6期35卷 53-65页

作者： D．A．storchak J．Schweitzer P．Bormann 邹立晔王碧泉不详中国地震局地球物理研究所

在2001年8月23日的河内会议上，国际地震学与地球内部物理学协会(IASPEI)地震观测与解释委员会决定成立标准震相命名工作组。该工作组将经修订的标准地震震相命名规则进行了汇总，以便在统一准则的基础上使其简明、一致、不解自明。我... 详细信息

在2001年8月23日的河内会议上，国际地震学与地球内部物理学协会(IASPEI)地震观测与解释委员会决定成立标准震相命名工作组。该工作组将经修订的标准地震震相命名规则进行了汇总，以便在统一准则的基础上使其简明、一致、不解自明。我们并非试图创立一套所有震相的完整列表。

关键词： IASPEI 标准地震震相表数据库走时模型观测指导