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Chen LC, Luo T, Cao ZY, Dalladay-Simpson P, Huang G, Peng D, Zhang LL, Gorelli FA, Zhong GH, Lin HQ, Chen XJ. Synthesis and superconductivity in yttrium-cerium hydrides at high pressures. Nat Commun 2024; 15:1809. [PMID: 38418489 PMCID: PMC10901869 DOI: 10.1038/s41467-024-46133-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 02/12/2024] [Indexed: 03/01/2024] Open
Abstract
Further increasing the critical temperature and/or decreasing the stabilized pressure are the general hopes for the hydride superconductors. Inspired by the low stabilized pressure associated with Ce 4f electrons in superconducting cerium superhydride and the high critical temperature in yttrium superhydride, we carry out seven independent runs to synthesize yttrium-cerium alloy hydrides. The synthetic process is examined by the Raman scattering and X-ray diffraction measurements. The superconductivity is obtained from the observed zero-resistance state with the detected onset critical temperatures in the range of 97-141 K. The upper critical field towards 0 K at pressure of 124 GPa is determined to be between 56 and 78 T by extrapolation of the results of the electrical transport measurements at applied magnetic fields. The analysis of the structural data and theoretical calculations suggest that the phase of Y0.5Ce0.5H9 in hexagonal structure with the space group of P63/mmc is stable in the studied pressure range. These results indicate that alloying superhydrides indeed can maintain relatively high critical temperature at relatively modest pressures accessible by laboratory conditions.
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Affiliation(s)
- Liu-Cheng Chen
- School of Science, Harbin Institute of Technology, Shenzhen, 518055, China
- Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China
| | - Tao Luo
- School of Science, Harbin Institute of Technology, Shenzhen, 518055, China
- Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China
| | - Zi-Yu Cao
- Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China
- Center for Quantum Materials and Superconductivity (CQMS) and Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | | | - Ge Huang
- Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China
| | - Di Peng
- Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China
| | - Li-Li Zhang
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, China
| | - Federico Aiace Gorelli
- Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China
- National Institute of Optics (INO-CNR) and European Laboratory for Non-Linear Spectroscopy (LENS), Via N. Carrara 1, 50019, Sesto Fiorentino (Florence), Italy
| | - Guo-Hua Zhong
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hai-Qing Lin
- School of Physics, Zhejiang University, Hangzhou, 310058, China
| | - Xiao-Jia Chen
- Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX, 77204, USA.
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Huang G, Peng D, Luo T, Chen LC, Dalladay-Simpson P, Cao ZY, Gorelli FA, Zhong GH, Lin HQ, Chen XJ. Synthesis of superconducting phase of La 0.5Ce 0.5H 10at high pressures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 36:075702. [PMID: 37918102 DOI: 10.1088/1361-648x/ad0915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 11/02/2023] [Indexed: 11/04/2023]
Abstract
Clathrate hydrideFm3-m-LaH10has been proven as the most extraordinary superconductor with the critical temperatureTcabove 250 K upon compression of hundreds of GPa in recent years. A general hope is to reduce the stabilization pressure and maintain the highTcvalue of the specific phase in LaH10. However, strong structural instability distortsFm3-mstructure and leads to a rapid decrease ofTcat low pressures. Here, we investigate the phase stability and superconducting behaviors ofFm3-m-LaH10with enhanced chemical pre-compression through partly replacing La by Ce atoms from both experiments and calculations. For explicitly characterizing the synthesized hydride, we choose lanthanum-cerium alloy with stoichiometry composition of 1:1. X-ray diffraction and Raman scattering measurements reveal the stabilization ofFm3-m-La0.5Ce0.5H10in the pressure range of 140-160 GPa. Superconductivity withTcof 175 ± 2 K at 155 GPa is confirmed with the observation of the zero-resistivity state and supported by the theoretical calculations. These findings provide applicability in the future explorations for a large variety of hydrogen-rich hydrides.
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Affiliation(s)
- Ge Huang
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, People's Republic of China
| | - Di Peng
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
- University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Tao Luo
- School of Science, Harbin Institute of Technology, Shenzhen 518055, People's Republic of China
| | - Liu-Cheng Chen
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, People's Republic of China
- School of Science, Harbin Institute of Technology, Shenzhen 518055, People's Republic of China
| | - Philip Dalladay-Simpson
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, People's Republic of China
| | - Zi-Yu Cao
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, People's Republic of China
- Center for Quantum Materials and Superconductivity (CQMS) and Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Federico A Gorelli
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, People's Republic of China
- National Institute of Optics (INO-CNR) and European Laboratory for Non-Linear Spectroscopy (LENS), Via N. Carrara 1, 50019 Sesto Fiorentino (Florence), Italy
| | - Guo-Hua Zhong
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, Shenzhen, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Hai-Qing Lin
- School of Physics, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Xiao-Jia Chen
- Department of Physics and Texas Center for Superconductivity, University of Houston, Houston TX 77204, United States of America
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Zong H, Wiebe H, Ackland GJ. Understanding high pressure molecular hydrogen with a hierarchical machine-learned potential. Nat Commun 2020; 11:5014. [PMID: 33024105 PMCID: PMC7538439 DOI: 10.1038/s41467-020-18788-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Accepted: 09/11/2020] [Indexed: 11/09/2022] Open
Abstract
The hydrogen phase diagram has several unusual features which are well reproduced by density functional calculations. Unfortunately, these calculations do not provide good physical insights into why those features occur. Here, we present a fast interatomic potential, which reproduces the molecular hydrogen phases: orientationally disordered Phase I; broken-symmetry Phase II and reentrant melt curve. The H2 vibrational frequency drops at high pressure because of increased coupling between neighbouring molecules, not bond weakening. Liquid H2 is denser than coexisting close-packed solid at high pressure because the favored molecular orientation switches from quadrupole-energy-minimizing to steric-repulsion-minimizing. The latter allows molecules to get closer together, without the atoms getting closer, but cannot be achieved within in a close-packed layer due to frustration. A similar effect causes negative thermal expansion. At high pressure, rotation is hindered in Phase I, such that it cannot be regarded as a molecular rotor phase.
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Affiliation(s)
- Hongxiang Zong
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3ET, UK. .,State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi, China.
| | - Heather Wiebe
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3ET, UK
| | - Graeme J Ackland
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3ET, UK.
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4
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Peña-Alvarez M, Afonina V, Dalladay-Simpson P, Liu XD, Howie RT, Cooke PIC, Magdau IB, Ackland GJ, Gregoryanz E. Quantitative Rotational to Librational Transition in Dense H 2 and D 2. J Phys Chem Lett 2020; 11:6626-6631. [PMID: 32674573 DOI: 10.1021/acs.jpclett.0c01736] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Raman spectroscopy demonstrates that the rotational spectrum of solid hydrogen, and its isotope deuterium, undergoes profound transformations upon compression while still remaining in phase I. We show that these changes are associated with a loss of quantum character in the rotational modes and that the angular momentum J gradually ceases to be a good quantum rotational number. Through isotopic comparisons of the rotational Raman contributions, we reveal that hydrogen and deuterium evolve from a quantum rotor to a harmonic oscillator. We find that the mechanics behind this transformation can be well-described by a quantum-mechanical single inhibited rotor, accurately reproducing the striking spectroscopic changes observed in phase I.
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Affiliation(s)
- Miriam Peña-Alvarez
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
| | - Veronika Afonina
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
| | - Philip Dalladay-Simpson
- Center for High Pressure Science & Technology Advanced Research, 1690 Cailun Road, Shanghai 201203, P. R. China
| | - Xiao-Di Liu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Ross T Howie
- Center for High Pressure Science & Technology Advanced Research, 1690 Cailun Road, Shanghai 201203, P. R. China
| | - Peter I C Cooke
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
| | - Ioan B Magdau
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
| | - Graeme J Ackland
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
| | - Eugene Gregoryanz
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
- Center for High Pressure Science & Technology Advanced Research, 1690 Cailun Road, Shanghai 201203, P. R. China
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
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5
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Wang Y, Zhang X, Jiang S, Geballe ZM, Pakornchote T, Somayazulu M, Prakapenka VB, Greenberg E, Goncharov AF. Helium-hydrogen immiscibility at high pressures. J Chem Phys 2019; 150:114504. [DOI: 10.1063/1.5086270] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- Yu Wang
- Key Laboratory of Materials Physics and Center for Energy Matter in Extreme Environments, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
- University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Xiao Zhang
- Key Laboratory of Materials Physics and Center for Energy Matter in Extreme Environments, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
- University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Shuqing Jiang
- Key Laboratory of Materials Physics and Center for Energy Matter in Extreme Environments, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Zachary M. Geballe
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington, District of Columbia 20015, USA
| | - Teerachote Pakornchote
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington, District of Columbia 20015, USA
- Department of Physics, Chulalongkorn University, Bangkok 10330, Thailand
| | - Maddury Somayazulu
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington, District of Columbia 20015, USA
| | - Vitali B. Prakapenka
- Center for Advanced Radiations Sources, University of Chicago, Chicago, Illinois 60637, USA
| | - Eran Greenberg
- Center for Advanced Radiations Sources, University of Chicago, Chicago, Illinois 60637, USA
| | - Alexander F. Goncharov
- Key Laboratory of Materials Physics and Center for Energy Matter in Extreme Environments, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
- University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington, District of Columbia 20015, USA
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6
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Zha CS, Liu H, Tse JS, Hemley RJ. Melting and High P-T Transitions of Hydrogen up to 300 GPa. PHYSICAL REVIEW LETTERS 2017; 119:075302. [PMID: 28949699 DOI: 10.1103/physrevlett.119.075302] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Indexed: 06/07/2023]
Abstract
High P-T Raman spectra of hydrogen in the vibron and lattice mode regions were measured up to 300 GPa and 900 K using externally heated diamond anvil cell techniques. A new melting line determined from the disappearance of lattice mode excitations was measured directly for the first time above 140 GPa. The results differ from theoretical predictions and extrapolations from lower pressure melting relations. In addition, discontinuities in Raman frequencies are observed as a function of pressure and temperature indicative of phase transition at these conditions. The appearance of a new Raman feature near 2700 cm^{-1} at ∼300 GPa and 370 K indicates the transformation to a new crystalline phase. Theoretical calculations of the spectrum suggest the new phase is the proposed Cmca-4 metallic phase. The transition pressure is close to that of a recently reported transition observed on dynamic compression.
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Affiliation(s)
- Chang-Sheng Zha
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
| | - Hanyu Liu
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
| | - John S Tse
- Department of Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5B2, Canada
| | - Russell J Hemley
- Department of Civil and Environmental Engineering, The George Washington University, Washington, DC 20052, USA
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7
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Raman measurements of phase transitions in dense solid hydrogen and deuterium to 325 GPa. Proc Natl Acad Sci U S A 2014; 111:4792-7. [PMID: 24639543 DOI: 10.1073/pnas.1402737111] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Raman spectroscopy of dense hydrogen and deuterium performed to 325 GPa at 300 K reveals previously unidentified transitions. Detailed analysis of the spectra from multiple experimental runs, together with comparison with previous infrared and Raman measurements, provides information on structural modifications of hydrogen as a function of density through the I-III-IV transition sequence, beginning near 200 GPa at 300 K. The data suggest that the transition sequence at these temperatures proceeds by formation of disordered stacking of molecular and distorted layers. Weaker spectral changes are observed at 250, 285, and 300 GPa, that are characterized by discontinuities in pressure shifts of Raman frequencies, and changes in intensities and linewidths. The results indicate changes in structure and bonding, molecular orientational order, and electronic structure of dense hydrogen at these conditions. The data suggest the existence of new phases, either variations of phase IV, or altogether new structures.
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8
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Borstad GM, Yoo CS. Hydrogen bonding induced proton exchange reactions in dense D2-NH3 and D2-CH4 mixtures. J Chem Phys 2014; 140:044510. [DOI: 10.1063/1.4862823] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Eremets MI, Troyan IA. Conductive dense hydrogen. NATURE MATERIALS 2011; 10:927-31. [PMID: 22081083 DOI: 10.1038/nmat3175] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2011] [Accepted: 10/18/2011] [Indexed: 05/10/2023]
Abstract
Molecular hydrogen is expected to exhibit metallic properties under megabar pressures. This metal is predicted to be superconducting with a very high critical temperature, T(c), of 200-400 K, and it may acquire a new quantum state as a metallic superfluid and a superconducting superfluid. It may potentially be recovered metastably at ambient pressures. However, experiments carried out at low temperatures, T<100 K, showed that at record pressures of 300 GPa, hydrogen remains in the molecular insulating state. Here we report on the transformation of normal molecular hydrogen at room temperature (295 K) to a conductive and metallic state. At 200 GPa the Raman frequency of the molecular vibron strongly decreased and the spectral width increased, evidencing a strong interaction between molecules. Deuterium behaved similarly. Above 220 GPa, hydrogen became opaque and electrically conductive. At 260-270 GPa, hydrogen transformed into a metal as the conductance of hydrogen sharply increased and changed little on further pressurizing up to 300 GPa or cooling to at least 30 K; and the sample reflected light well. The metallic phase transformed back at 295 K into molecular hydrogen at 200 GPa. This significant hysteresis indicates that the transformation of molecular hydrogen into a metal is accompanied by a first-order structural transition presumably into a monatomic liquid state. Our findings open an avenue for detailed and comprehensive studies of metallic hydrogen.
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Affiliation(s)
- M I Eremets
- Max Planck Institute for Chemistry, Biogeochemistry Department, PO Box 3060, 55020 Mainz, Germany.
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10
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Borstad GM, Yoo CS. H2O and D2 mixtures under pressure: Spectroscopy and proton exchange kinetics. J Chem Phys 2011; 135:174508. [DOI: 10.1063/1.3658485] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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11
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Feldman JL, Johnson JK, Hemley RJ. Vibron hopping and bond anharmonicity in hot dense hydrogen. J Chem Phys 2009; 130:054502. [DOI: 10.1063/1.3072713] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Chacham H, Reis SP, Koiller B. Band-gap closure of H2–He mixtures under pressure. J Chem Phys 1998. [DOI: 10.1063/1.477004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Chen NH, Sterer E, Silvera IF. Extended infrared studies of high pressure hydrogen. PHYSICAL REVIEW LETTERS 1996; 76:1663-1666. [PMID: 10060486 DOI: 10.1103/physrevlett.76.1663] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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14
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Goncharov AF, Mazin II, Eggert JH, Hemley RJ, Mao H. Invariant points and phase transitions in deuterium at megabar pressures. PHYSICAL REVIEW LETTERS 1995; 75:2514-2517. [PMID: 10059331 DOI: 10.1103/physrevlett.75.2514] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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15
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Natoli V, Martin RM, Ceperley D. Crystal structure of molecular hydrogen at high pressure. PHYSICAL REVIEW LETTERS 1995; 74:1601-1604. [PMID: 10059070 DOI: 10.1103/physrevlett.74.1601] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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16
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Chacham H, Falicov LM, Koiller B. Orientational disorder and the band gap of solid molecular hydrogen under pressure. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:7195-7198. [PMID: 9974687 DOI: 10.1103/physrevb.50.7195] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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18
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Cui L, Chen NH, Jeon SJ, Silvera IF. Megabar pressure triple point in solid deuterium. PHYSICAL REVIEW LETTERS 1994; 72:3048-3051. [PMID: 10056054 DOI: 10.1103/physrevlett.72.3048] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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19
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Kaxiras E, Guo Z. Orientational order in dense molecular hydrogen: A first-principles path-integral Monte Carlo calculation. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:11822-11832. [PMID: 10010051 DOI: 10.1103/physrevb.49.11822] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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20
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Zha C, Duffy TS, Mao H, Hemley RJ. Elasticity of hydrogen to 24 GPa from single-crystal Brillouin scattering and synchrotron x-ray diffraction. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:9246-9255. [PMID: 10007158 DOI: 10.1103/physrevb.48.9246] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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21
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Hemley RJ, Eggert JH, Mao H. Low-frequency Raman spectroscopy of deuterium to megabar pressures at 77-295 K. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:5779-5788. [PMID: 10009110 DOI: 10.1103/physrevb.48.5779] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Surh MP, Barbee TW, Mailhiot C. Zero-point motion and the insulator-metal transition in solid molecular hydrogen. PHYSICAL REVIEW LETTERS 1993; 70:4090-4093. [PMID: 10054044 DOI: 10.1103/physrevlett.70.4090] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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23
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Hanfland M, Hemley RJ, Mao H. Novel infrared vibron absorption in solid hydrogen at megabar pressures. PHYSICAL REVIEW LETTERS 1993; 70:3760-3763. [PMID: 10053955 DOI: 10.1103/physrevlett.70.3760] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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24
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Chacham H, Zhu X, Louie SG. Pressure-induced insulator-metal transitions in solid xenon and hydrogen: A first-principles quasiparticle study. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:6688-6699. [PMID: 10002369 DOI: 10.1103/physrevb.46.6688] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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25
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Hanfland M, Hemley RJ, Mao HK, Williams GP. Synchrotron infrared spectroscopy at megabar pressures: Vibrational dynamics of hydrogen to 180 GPa. PHYSICAL REVIEW LETTERS 1992; 69:1129-1132. [PMID: 10047130 DOI: 10.1103/physrevlett.69.1129] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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26
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Saumon D, Chabrier G. Fluid hydrogen at high density: Pressure ionization. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 46:2084-2100. [PMID: 9908345 DOI: 10.1103/physreva.46.2084] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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27
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Nellis WJ, Mitchell AC, McCandless PC, Erskine DJ, Weir ST. Electronic energy gap of molecular hydrogen from electrical conductivity measurements at high shock pressures. PHYSICAL REVIEW LETTERS 1992; 68:2937-2940. [PMID: 10045533 DOI: 10.1103/physrevlett.68.2937] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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28
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Nagara H, Nakamura T. Stable phases of solid hydrogen at megabar pressures and at zero temperature. PHYSICAL REVIEW LETTERS 1992; 68:2468-2471. [PMID: 10045405 DOI: 10.1103/physrevlett.68.2468] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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29
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Mao HK, Hemley RJ, Hanfland M. Stability of ruby in solid hydrogen at megabar pressures. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:8108-8111. [PMID: 10000624 DOI: 10.1103/physrevb.45.8108] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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30
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Saumon D, Chabrier G. Fluid hydrogen at high density: Pressure dissociation. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:5122-5141. [PMID: 9906567 DOI: 10.1103/physreva.44.5122] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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31
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Lorenzana HE, Jeanloz R. Thermodynamic properties of solid hydrogen at 150 GPa. J Chem Phys 1991. [DOI: 10.1063/1.460784] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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32
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Kaxiras E, Broughton J, Hemley RJ. Onset of metallization and related transitions in solid hydrogen. PHYSICAL REVIEW LETTERS 1991; 67:1138-1141. [PMID: 10045085 DOI: 10.1103/physrevlett.67.1138] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Loubeyre P, Jean-Louis M, Silvera IF. Density dependence of the intramolecular distance in solid H2: A. Spectroscopic determination. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:10191-10196. [PMID: 9996736 DOI: 10.1103/physrevb.43.10191] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Hanfland M, Hemley RJ, Mao HK. Optical absorption measurements of hydrogen at megabar pressures. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:8767-8770. [PMID: 9996542 DOI: 10.1103/physrevb.43.8767] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Chacham H, Louie SG. Metallization of solid hydrogen at megabar pressures: A first-principles quasiparticle study. PHYSICAL REVIEW LETTERS 1991; 66:64-67. [PMID: 10043143 DOI: 10.1103/physrevlett.66.64] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Solid Hydrogen at Ultra High Pressure. ACTA ACUST UNITED AC 1991. [DOI: 10.1007/978-1-4899-2480-3_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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