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期刊信息/Journal information

中国科学:物理学力学天文学（英文版）

主　　编：周光召

出版周期：月刊

国际刊号：1674-7348

电子邮箱：sales@scichina.org

电　　话：010-64019820

邮政编码：100717

地　　址：北京东黄城根北街16号

中国科学:物理学力学天文学（英文版）/Journal Science China(Physics, Mechanics&Astronomy)CSCDCSTPCDEISCI

查看更多>>《中国科学》是中国科学院主办、中国科学杂志社出版的自然科学专业性学术刊物。《中国科学》任务是反映中国自然科学各学科中的最新科研成果，以促进国内外的学术交流。《中国科学》以论文形式报道中国基础研究和应用研究方面具有创造性的、高水平的和有重要意义的科研成果。在国际学术界，《中国科学》作为代表中国最高水平的学术刊物也受到高度重视。国际上最具有权威的检索刊物SCI，多年来一直收录《中国科学》的论文。1999年《中国科学》夺得国家期刊奖的第一名。

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Resolving aging dynamics of a 3D colloidal glass

XiaoJuan WangJun DuanGan DingYunZhuo Lu...

110-118页

查看更多>>摘要：Physical aging is an inherent property of glassy matter,but understanding its microscopic mechanism remains a challenge particularly at the particle level.In this work,we use a confocal microscope to in-situ trace the particle trajectories in a 3D colloidal glass for 73000 s,aiming at resolving the aging dynamics.By calculating the mean square displacement of particle motions,we find that the glass aging with time can be divided into three stages:β relaxation,a relaxation and free diffusion.The system's mean square displacement at each aging state is quantitatively resolved into three contributions of particle dynamics modes:vibration within the nearest-neighbor cages,hopping between cages and cooperative rearrangement.We further calculate the particle's free volume and find that the β-to-α transition is accompanied by the temporary increase of the system-averaged free volume due to pronounced hops of particles.Nevertheless,the temporal autocorrelation of the free volume spatial dis-tribution still obeys a monotonically stretched exponential decay with an exponent of 0.76,which is related to the sub-diffusion dynamics of cooperative rearrangements and hops mixed in a relaxation.According to the resolved vibrational displacements,we calculate the vibrational density of states of this 3D glass,and the characteristic boson peak is reproduced at low frequencies.Our findings shed insight into the particle-level aging dynamics of a real glass under purely thermal activation.

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Unveiling the time-temperature dependence of metastability of supercooled liquid using nano-calorimetry

Yijun DingLijian SongZheng WangRuiqi Yu...

119-127页

查看更多>>摘要：There is a lack of understanding of both the conversion of an unstable glass into a metastable supercooled liquid(MSL)upon heating and the metastability of MSLs.In this study,we investigated the time-and temperature-dependent metastability of an MSL using an advanced nano-calorimetric technique.The chosen Au-based metallic glass(AuMG)allowed adequate probing of its MSL in a temperature range between 10 and 70 K above the standard glass transition temperature.We found that the survival time of the MSL state is a quadratic function of temperature.Beyond this duration threshold,the sample undergoes fast crystallization even if it is below the crystallization temperature that is measured using differential scanning calorimetry.Employing transmission electron microscopy,we observed the formation of clusters with a partially ordered lattice structure during relaxation in the AuMG sample fabricated using a nano-calorimeter.The atomic ordering within the clusters was enhanced by increasing time and temperature in the MSL region.Once the as-produced glass entered the MSL stage upon heating followed by a quenching stage at a given rate,the mechanical properties of the quenched glass remained the same regardless of its holding temperature and duration within the MSL region.This work provides insights into the glass-MSL-crystal transfor-mation and offers guidance for designing standard metallic glasses for property characterizations.

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Tunable magneto-Seebeck effect in Co2FeSi/MgO/Co2FeSi heterostructure via optimized interfacial engineering

Jingyu LiXianbiao ShiYurong JinLe Ma...

128-135页

查看更多>>摘要：Enhancing the tunneling magneto-Seebeck(TMS)ratio and uncovering its underlying mechanism are greatly demanded in spin caloritronics.The magnitude and sign of the TMS effect depend on the type of atom and the stacking order of atoms at the inter-faces.Herein,we demonstrate that TMS ratios can be effectively manipulated by altering heterogonous or homogeneous interface through decoration on the CoFeSi(001)surface inserted on the MgO insulating layers.The maximum TMS ratio of pure Co2/O termination is 4565％at 800 K.Notably,the TMS ratio of the FeSi/O termination has two peak values,of which the maximum could reach up to-3290％at 650 K.By comparing two different atom arrangements at the interface,we reveal that the sign and symbol of the TMS ratio can be controlled by the temperature and different atomic configurations at the Co2FeSi/MgO interface.Furthermore,the spin-Seebeck coefficient up to～150 μV/K is also possible when we select suitable terminations and temper-atures.These findings will provide useful insights into how to control the sign and symbol of the TMS ratio and accordingly stimulate the development field of magneto-thermoelectric power and spin caloritronic devices based on the magneto-Seebeck effect in Heusler-based metallic multilayers.

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High-order time-reversal symmetry breaking normal state

Meng ZengLun-Hui HuHong-Ye HuYi-Zhuang You...

136-148页

查看更多>>摘要：Spontaneous time-reversal symmetry breaking plays an important role in studying strongly correlated unconventional supercon-ductors.When two superconducting gap functions with different symmetries compete,the relative phase channel(θ_≡ θ1-θ2)exhibits an Ising-type Z2 symmetry due to the second order Josephson coupling,where θ1,2 are the phases of two gap functions.In contrast,the U(1)symmetry in the channel of θ+=θ1+θ2/2is intact.The phase locking,i.e.,ordering of θ_,can take place in the phase fluctuation regime before the onset of superconductivity,i.e.,when θ+is disordered.If θ-is pinned at±π/2,then time-reversal symmetry is broken in the normal state,otherwise,if θ_=0,or,π,rotational symmetry is broken,leading to a nematic normal state.In both cases,the order parameters possess a 4-fermion structure beyond the scope of mean-field theory,which can be viewed as a high order symmetry breaking.We employ an effective two-component XY-model assisted by a renormalization group analysis to address this problem.As a natural by-product,we also find the other interesting intermediate phase corresponds to ordering of θ+but with θ_disordered.This is the quartetting,or,charge-4e,superconductivity,which occurs above the low temperature Z2-breaking charge-2e superconducting phase.Our results provide useful guidance for studying novel symmetry breaking phases in strongly correlated superconductors.

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Chiral phonon activated spin Seebeck effect in chiral materials

Xiao LiJinxin ZhongJinluo ChengHao Chen...

149-155页

查看更多>>摘要：Efficient generation of spin polarization is very important for spintronics and quantum computation.In chiral materials without magnetic order nor spin-orbit coupling,we find a new spin selectivity effect-chiral phonon activated spin Seebeck(CPASS)effect.Starting with the nonequilibrium distribution of chiral phonons under a temperature gradient,the CPASS coefficients are computed based on the Boltzmann transport theory.With both the phonon-drag and band transport contributions,the spin accumulations generated by the CPASS effect exhibit quadratic dependence on the temperature gradient.The strength of the CPASS effect and the relative magnitude of both contributions are tunable by the chemical potential modulation.The CPASS effect,which gives a promising explanation on the traditional chiral-induced spin selectivity effect,provides opportunities for the exploration of advanced spintronic devices based on chiral materials even in the absence of any magnetic order and spin-orbit coupling.

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High-pressure synthesis of a ternary yttrium-sulfur hydride superconductor with a high Tc of approximately 235 K

Kexin ZhangWuhao ChenYuchen ZhangJianning Guo...

156-162页

查看更多>>摘要：Ternary hydrides have attracted considerable worldwide attention owing to their potential high-temperature superconducting phases.In contrast to previously reported alloy-based ternary hydrides,we selected the rare earth metal yttrium and light element sulfur to form new yttrium-sulfur hydride superconductors as the target at high pressure,which also linked the two categories of binary clathrate YH6 and covalent H3S high-temperature superconductors.The rare earth metal ions served as carrier donors for the dissociation of H2 molecules and the formation of clathrate-like cage structures,while the light elements helped stabilize the materials.By applying high-pressure and high-temperature conditions,two possible ternary hydrides,i.e.,Im(3)m-(Y,S)H6+δ and I4/mmm-(Y,S)H4+δ,were discovered.Im(3 )m-(Y,S)H6+δ is a ternary hydride with a record superconducting transition temperature(Tc)of 235 K belonging to the single-metal hydride system,exhibiting an 11％increment in Te compared with binary Im3m-YH6.In the pressure range of 199-249 GPa,the Tc of this phase displayed a decreasing tendency but with an apparent slope change,indicating the possible structural distortions or electronic structure changes at 227 GPa.Concurrently,the ex-trapolated upper critical magnetic field Hc2 was determined to be 85 T using the Werthamer-Helfand-Hohenberg formula at 199 GPa,with a 37％increment compared with Imi(3)m-YH6.The slight volume expansion(～3％)of Im(3)m-(Y,S)H6+δ compared with that of binary Im3m-YH6 signified the possible interstitial sites of sulfur atoms filling into the hydrogen cages.The size expansion of the center atoms might attract more hydrogen atoms to stabilize the hydrogen cages,contributing to the en-hancement of Tc and Hc2 in Im(3)m-(Y,S)H6+δ.The present study demonstrates that introduction of light elements is an effective way for enhancing Tc by forming larger hydrogen cages.

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