Counterintuitive effects of isotopic doping on the phase diagram of H-2-HD-D-2 molecular alloy

doi:10.1073/pnas.2001128117

	Counterintuitive effects of isotopic doping on the phase diagram of H-2-HD-D-2 molecular alloy
	Liu, Xiao-Di 6; Dalladay-Simpson, Philip 5; Howie, Ross T.5; Zhang, Hui-Chao 4,6; Xu, Wan 4,6; Binns, Jack 1,5; Ackland, Graeme J.2,3; Mao, Ho-Kwang 5; Gregoryanz, Eugene 2,3,5,6
刊名	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2020-06-16
卷号	117
关键词	hydrogen deuterium high pressure
ISSN号	0027-8424
DOI	10.1073/pnas.2001128117
通讯作者	Liu, Xiao-Di(xiaodi@issp.ac.cn) ; Mao, Ho-Kwang(maohk@hpstar.ac.cn) ; Gregoryanz, Eugene(e.gregoryanz@ed.ac.uk)
英文摘要	Molecular hydrogen forms the archetypical quantum solid. Its quantum nature is revealed by behavior which is classically impossible and by very strong isotope effects. Isotope effects between H-2, D-2, and HD molecules come from mass difference and the different quantum exchange effects: fermionic H-2 molecules have antisymmetric wavefunctions, while bosonic D-2 molecules have symmetric wavefunctions, and HD molecules have no exchange symmetry. To investigate how the phase diagram depends on quantum-nuclear effects, we use high-pressure and low-temperature in situ Raman spectroscopy to map out the phase diagrams of H-2-HD-D-2 with various isotope concentrations over a wide pressure-temperature (P-T) range. We find that mixtures of H-2, HD, and D-2 behave as an isotopic molecular alloy (ideal solution) and exhibit symmetry-breaking phase transitions between phases I and II and phase III. Surprisingly, all transitions occur at higher pressures for the alloys than either pure H-2 or D-2. This runs counter to any quantum effects based on isotope mass but can be explained by quantum trapping of high-kinetic energy states by the exchange interaction.
资助项目	National Science Foundation of China[11874361] ; National Science Foundation of China[11404343] ; National Science Foundation of China[51672279] ; National Science Foundation of China[51727806] ; National Science Foundation of China[11774354] ; Chinese Academy of Sciences Innovation Fund[CXJJ-19-B08] ; Science Challenge Project[TZ201601] ; Hefei Institutes of Physical Science Chinese Academy of Sciences Director's Fund[YZJJ201705] ; European Research Council (Hecate)
WOS关键词	HYDROGEN ; TRANSITIONS ; DEUTERIUM
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATL ACAD SCIENCES
WOS记录号	WOS:000546040300005
资助机构	National Science Foundation of China ; Chinese Academy of Sciences Innovation Fund ; Science Challenge Project ; Hefei Institutes of Physical Science Chinese Academy of Sciences Director's Fund ; European Research Council (Hecate)
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/71114]
专题	中国科学院合肥物质科学研究院
通讯作者	Liu, Xiao-Di; Mao, Ho-Kwang; Gregoryanz, Eugene
作者单位	1.RMIT Univ, Sch Sci, Melbourne, Vic 3000, Australia 2.Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3FD, Midlothian, Scotland 3.Univ Edinburgh, Ctr Sci Extreme Condit, Edinburgh EH9 3FD, Midlothian, Scotland 4.Univ Sci & Technol China, Hefei 230026, Peoples R China 5.Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China 6.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xiao-Di,Dalladay-Simpson, Philip,Howie, Ross T.,et al. Counterintuitive effects of isotopic doping on the phase diagram of H-2-HD-D-2 molecular alloy[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117.
APA	Liu, Xiao-Di.,Dalladay-Simpson, Philip.,Howie, Ross T..,Zhang, Hui-Chao.,Xu, Wan.,...&Gregoryanz, Eugene.(2020).Counterintuitive effects of isotopic doping on the phase diagram of H-2-HD-D-2 molecular alloy.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117.
MLA	Liu, Xiao-Di,et al."Counterintuitive effects of isotopic doping on the phase diagram of H-2-HD-D-2 molecular alloy".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117(2020).