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Unveiling a novel metal-to-metal transition in LuH_(2):Critically challenging superconductivity claims in lutetium hydrides

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Matter and Radiation at Extremes 2024年第3期9卷 65-73页

作者： Dong Wang Ningning Wang Caoshun Zhang Chunsheng Xia Weicheng Guo Xia Yin Kejun Bu Takeshi Nakagawa Jianbo Zhang Federico Gorelli Philip Dalladay-Simpson Thomas Meier Xujie Lü Liling Sun Jinguang Cheng Qiaoshi Zeng Yang Ding ho-kwang mao Center for High-Pressure Science and Technology Advanced Research Beijing 100094China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree) Shanghai Advanced Research in Physical Sciences(SHARPS)Shanghai 201203China

Following the recent report by Dasenbrock-Gammon et al.[Nature 615,244–250(2023)]of near-ambient superconductivity in nitrogendoped lutetium trihydride(LuH_(3-δ)N_(ε)),significant debate has emerged surrounding the composition and interpretation of the observed sharp resistance ***,we meticulously revisit these claims through comprehensive characterization and *** definitively identify the reported material as lutetium dihydride(LuH_(2)),resolving the ambiguity surrounding its *** similar conditions(270–295 K and 1–2 GPa),we replicate the reported sharp decrease in electrical resistance with a 30%success rate,aligning with the observations by Dasenbrock-Gammon et ***,our extensive investigations reveal this phenomenon to be a novel pressure-induced metal-to-metal transition intrinsic to LuH_(2),distinct from ***,nitrogen doping exerts minimal impact on this *** work not only elucidates the fundamental properties of LuH_(2)andLuH_(3),but also critically challenges the notion of superconductivity in these lutetium hydride *** findings pave the way for future research on lutetium hydride systems,while emphasizing the crucial importance of rigorous verification in claims of ambient-temperature superconductivity.

关键词： resistance hydride superconductivity

Harnessing chemical pressure

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National Science Review 2023年第12期10卷 45-47页

作者： ho-kwang mao Shanghai Advanced Research in Physical Sciences(SHARPS)

Pressure profoundly changes all physical characteristics of a condensed matter and provides a vast and fertile dimension to search for materials with extremely favorable properties for technological applications [1,2]. however, these favorable properties are only optimally tuned at a specific high pressure and will vanish or revert at the ambient pressure, rendering them merely of academic interest.

关键词： SUPERCONDUCTIVITY CU HYDRIDE

Dense hydrous silica carrying water to the deep Earth and promotion of oxygen fugacity heterogeneity

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Matter and Radiation at Extremes 2022年第6期7卷 76-78页

作者： Yanhao Lin ho-kwang mao Center for High Pressure Science and Technology Advanced Research Beijing 100193People’s Republic of China

Water has remarkable effects on the properties of mantle rocks,but,owing to the high temperatures in the mantle,uncertainties remain about how and how much water is transported into the deep *** studies have shown that stishovite and post-stishovites as highpressure phases of SiO2 have the potential to carry weight percent levels of water into the Earth’s interior along the geotherm of the subducting oceanic *** slabs are subducted to the deepest mantle,dehydration of these dense hydrous silica phases has the potential to change the physicochemical properties of the mantle by reducing melting points,forming new high-pressure phases,and enhancing the oxygen fugacity heterogeneity of the lower mantle.

关键词： Earth mantle silica

Geomimicry—Liberating high-pressure research by encapsulation

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Matter and Radiation at Extremes 2022年第6期7卷 79-81页

作者： ho-kwang mao Wendy L.mao Center for High Pressure Science and Technology Advanced Research 10 Dongbeiwang West RoadHaidianBeijing 100094China Department of Geological Sciences Stanford UniversityStanfordCalifornia 94305USA

High pressures induce changes of properties and structures that could greatly impact materials science if such changes were preserved for ambient *** the geological process of diamond formation that the pressures and high-pressure phases in diamond inclusions can be preserved by the strong diamond envelope,we discuss the perspectives that such process revolutionizes high-pressure science and technology and opens a great potential for creation of functional materials with extremely favorable properties.

关键词： properties ambient process

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Matter and Radiation at Extremes 2022年第6期7卷 1-2页

作者： ho-kwang maoa Center for High Pressure Science and Technology Advanced Research 10 Xibeiwang East RoadHaidianBeijing 100094China

The behavior of hydrogen under extreme pressure has continued to attract great interest among the physics,chemistry,materials science,and geoscience communities and has become a major driving incentive for cross-disciplinary advances in novel high-pressure *** has been particularly noticeable this year,and is one of the main themes of this“Special Issue on High Pressure Science 2021.”Hydrogen exhibits a rich physics of multiple phase transitions,including a predicted novel quantum state combining superconductivity and superfluidity upon metallization,and also provides benchmark values for testing theoretical models of quantum solids at high densities.

关键词： dimension driving solids

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地球宜居性的深部驱动机制

科学通报 2024年第2期69卷 169-183页

作者：徐义刚黄小龙王强王煜李高军刘耘毛河光倪怀玮朱茂炎中国科学院广州地球化学研究所同位素地球化学国家重点实验室广州510640 南京大学地球科学与工程学院南京210023 中国科学院地球化学研究所矿床地球化学国家重点实验室贵阳550081 北京高压科学研究中心北京100094 中国科学技术大学中国科学院壳幔物质与环境重点实验室合肥230026 中国科学院南京地质古生物研究所现代古生物和地层学国家重点实验室南京210080

除与太阳之间的距离和行星的大小有关外,地球之所以宜居的一个重要因素是其拥有动力十足的地球内部.与地球宜居性是地球表生作用结果的传统认识不同,本文认为地球深部驱动着对宜居环境至关重要的外部层圈,并提出地球内外层圈间的联动机... 详细信息

除与太阳之间的距离和行星的大小有关外,地球之所以宜居的一个重要因素是其拥有动力十足的地球内部.与地球宜居性是地球表生作用结果的传统认识不同,本文认为地球深部驱动着对宜居环境至关重要的外部层圈,并提出地球内外层圈间的联动机制是地球系统科学研究的突破口.在调研和评述的基础上,本文建议未来研究需要关注早期地球、地磁场、深地挥发分循环、超级火山、深地新化学反应和地质空调器等方向,围绕地球宜居性的深部驱动机制这一主题,开展地球固体层圈与流体层圈的整合研究,助力我国地球科学研究从单一学科研究向多学科交叉融合研究的转变,推动我国固体地球科学从跟踪前沿向开拓前沿的跨越式发展.

关键词：地球宜居性深部引擎深地过程层圈相互作用地球系统科学

Triggering dynamics of acetylene topochemical polymerization

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Matter and Radiation at Extremes 2023年第5期8卷 82-88页

作者： Xingyu Tang Xiao Dong Chunfang Zhang Kuo Li Haiyan Zheng ho-kwang mao Center for High Pressure Science and Technology Advanced Research Beijing 100193People’s Republic of China Key Laboratory of Weak-Light Nonlinear Photonics School of PhysicsNankai UniversityTianjin 300071People’s Republic of China College of Chemistry and Materials Science Hebei UniversityBaoding 071002People’s Republic of China

Topochemical reactions are a promising method to obtain crystalline polymeric materials with distance-determined regio-or *** has been concluded on an empirical basis that the closest intermolecular C⋅⋅⋅C distance in crystals of alkynes,d(C⋅⋅⋅C)min,should reach a threshold of∼3Åfor bonding to occur at room *** understand this empirical threshold,we study here the polymerization of acetylene in the crystalline state under high pressure by calculating the structural geometry,vibrational modes,and reaction *** find d(C⋅⋅⋅C)min to be the sum of an intrinsic threshold of 2.3Åand a thermal displacement of 0.8Å(at room temperature).Molecules at the empirical threshold move via several phonon modes to reach the intrinsic threshold,at which the intermolecular electronic interaction is sharply enhanced and bonding commences.A distance–vibration-based reaction picture is thus demonstrated,which provides a basis for the prediction and design of topochemical reactions,as well as an enhanced understanding of the bonding process in solids.

关键词： temperature bonding polymerization

The near-room-temperature upsurge of electrical resistivity in Lu-H-N is not superconductivity,but a metal-to-poor-conductor transition

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Matter and Radiation at Extremes 2023年第5期8卷 96-98页

作者： Di Peng Qiaoshi Zeng Fujun Lan Zhenfang Xing Yang Ding ho-kwang mao Center for High Pressure Science and Technology Advanced Research Shanghai 201203China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree) Shanghai Advanced Research in Physical Sciences(SHARPS)Shanghai 201203China State Key Laboratory of Superhard Materials Institute of PhysicsJilin UniversityChangchun 130012China

The recent report of superconductivity in nitrogen-doped lutetium hydride(Lu-H-N)at 294 K and 1 GPa brought hope for long-sought-after ambient-condition ***,the failure of scientists worldwide to independently reproduce these results has cast intense skepticism on this exciting *** this work,using a reliable experimental protocol,we synthesized Lu-H-N while minimizing extrinsic influences and reproduced the sudden change in resistance near room *** quantitative comparison of the temperaturedependent resistance between Lu-H-N and the pure lutetium before reaction,we were able to clarify that the drastic resistance change is most likely caused by a metal-to-poor-conductor transition rather than by ***,we also briefly discuss other issues recently raised in relation to the Lu-H-N system.

关键词： resistance superconductivity transition

Evolution of Superconducting-Transition Temperature with Superfluid Density and Conductivity in Pressurized Cuprate Superconductors

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Chinese Physics Letters 2024年第4期41卷 110-117页

作者：赵金瑜蔡树陈逸雯顾根大闫宏涛郭静韩金宇王鹏玉周亚洲李延春李晓东任治安吴奇周兴江丁阳向涛毛河光孙力玲 Institute of Physics Chinese Academy of SciencesBeijing 100190China Center for High Pressure Science&Technology Advanced Research Beijing 100094China Condensed Matter Physics&Materials Science Department Brookhaven National LaboratoryNY 11973-5000USA University of Chinese Academy of Sciences Beijing 100190China Institute of High Energy Physics Chinese Academy of ScienceBeijing 100049China Beijing Academy of Quantum Information Sciences Beijing 100193China

What factors fundamentally determine the value of superconducting transition temperature Tc in high temperature superconductors has been the subject of intense *** the establishment of an empirical law known as homes'law,there is a growing consensus in the community that the Tc value of the cuprate superconductors is closely linked to the superfluid density(ρ_(s))of its ground state and the conductivity(σ)of its normal ***,all the data supporting this empirical law(ρ_(s)=AσT_(c))have been obtained from the ambientpressure *** this study,we present the first high-pressure results about the connection of the quantities of ρ_(s) and σ with T_(c),through the studies on the Bi_(1.74)Pb_(0.38)Sr_(1.88)CuO_(6+δ)and Bi_(2)Sr_(2)CaCu_(2)O_(8+δ),in which the value of their high-pressure resistivity(ρ=1/σ)is achieved by adopting our newly established method,while the quantity ofρs is extracted using homes'*** highlight that the Tc values are strongly linked to the joint response factors of magnetic field and electric field,i.e.,ρ_(s) and σ,respectively,implying that the physics determining T_(c) is governed by the intrinsic electromagnetic fields of the system.

关键词： superconductors Transition Conductivity