1
|
Brigiano FS, Thévenet T, Markovits A, Contreras-García J, Miguel AS, Pietrucci F. Structural transitions at the bilayer graphene-methanol interface from ab initio molecular dynamics. Phys Chem Chem Phys 2025; 27:10153-10165. [PMID: 40304049 DOI: 10.1039/d5cp00605h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2025]
Abstract
The precise tailoring of the atomic architecture of 2D carbon-based materials, which results in the modulation of their physical properties, promises to open new pathways for the design of technological devices in electronics, spintronics and energy storage. High-pressure conditions can lead to the synthesis of complex materials starting from multi-layer graphene, often relying on chemical transformations at the interface between carbon and pressure-transmitting media like water or alcohol. Unfortunately, the experimental characterization of molecular-scale mechanisms at interfaces is very challenging. On the other side, the sheer cost of ab initio simulations strongly limited, so far, the computational works in literature to simplified models that, often, do not capture the complexity of the materials and finite-temperature effects. In this work, we provide for the first time an extensive computational study of complex, realistic models of bilayer graphene-methanol interfaces at high pressure and finite temperature. Our simulations allow fundamental insight to be gained on several questions raised from previous experimental works about structural, electronic and reactivity properties of this challenging material. The exploitation of state-of-the-art enhanced sampling techniques combined with topological electronic descriptors allowed characterization of barrier-activated functionalization processes, unveiling a major catalytic effect of carbon defects and pressure towards sp3 formation.
Collapse
Affiliation(s)
- Flavio Siro Brigiano
- Sorbonne Universite, Laboratoire de Chimie Theorique, CNRS UMR 7616, Paris, 75005, France.
| | - Thomas Thévenet
- Sorbonne Universite, Laboratoire de Chimie Theorique, CNRS UMR 7616, Paris, 75005, France.
| | - Alexis Markovits
- Sorbonne Universite, Laboratoire de Chimie Theorique, CNRS UMR 7616, Paris, 75005, France.
| | - Julia Contreras-García
- Sorbonne Universite, Laboratoire de Chimie Theorique, CNRS UMR 7616, Paris, 75005, France.
| | - Alfonso San Miguel
- Sorbonne Universite, Museum National d'Histoire Naturelle, UMR CNRS 7590, IRD, Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie, IMPMC, F-75005 Paris, France
| | - Fabio Pietrucci
- Institut Lumiere Matiere, UMR5306 Universite Lyon 1-CNRS, Universite de Lyon, Villeurbanne, F-69622, cedex, France
| |
Collapse
|
2
|
Landeros-Rivera B, Contreras-García J, Martín Pendás Á. Code dependence of calculated crystalline electron densities. Possible lessons for quantum crystallography. IUCRJ 2025; 12:295-306. [PMID: 40152808 PMCID: PMC12044850 DOI: 10.1107/s2052252525001721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2024] [Accepted: 02/24/2025] [Indexed: 03/29/2025]
Abstract
The use of electronic structure methods in crystallographic data analysis, the now well known field of quantum crystallography, aids in the solution of several problems in X-ray diffraction refinement, as well as opening new avenues to access a whole new set of experimentally available observables. A key ingredient in quantum crystallography is the theoretically derived electron density, ρ, obtained from standard electronic structure codes. Here, we introduce a factor that has not been carefully considered until now. As we demonstrate, theoretically derived ρ values depend not only on the set of computational conditions used to obtain them but also on the particular computational code selected for this task. We recommend that all quantum crystallographers carefully check the convergence of ρ before undertaking any serious study.
Collapse
Affiliation(s)
- Bruno Landeros-Rivera
- Departmento de Química Inorgánica y Nuclear, Universidad Nacional Autónoma De México, 04510Ciudad de México, México
| | - Julia Contreras-García
- Laboratoire de Chimie Théorique, Sorbonne Universite and CNRS, 4 Pl. Jussieu, F. 75005Paris, France
| | - Ángel Martín Pendás
- Departmento Química Física y Analítica, Universidad de Oviedo, 33006Oviedo, Spain
| |
Collapse
|
3
|
Tian C, Zhu YH, Du J, Zhong HX, Lu J, Wang X, Shi JJ. Ductile copper hydride Eliashberg superconductors with Tc in the liquid-nitrogen temperature range and band topology at ambient pressure. MATERIALS HORIZONS 2025. [PMID: 40242935 DOI: 10.1039/d5mh00177c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/18/2025]
Abstract
The engineering demands for superconductors require not only a high transition temperature (Tc) but also eco-friendliness, mechanical workability, and abundance. Currently, superconductors exhibiting both mechanical ductility and Tc above the liquid-nitrogen temperature are still lacking. Considering that copper is one of the most important conductive materials for power transmission, we investigate the synthetic routes, band topology, electron-phonon coupling (EPC) and anharmonic superconductivity of copper hydrides using first-principles calculations. Cubic-Cu4H3 remains stable at ambient pressure after kinetic simulations from its experimentally synthesized pressure state. The incorporation of hydrogen impacts the ductility of Cu4H3 negligibly compared to copper, while enabling high-Tc superconductivity up to 77 K and non-trivial band topology at ambient pressure. The novel properties arise from the strong EPC, Fermi surface nesting and hydrogen-induced band inversion. This discovery may fill the gap in the lack of ductile superconductors in the liquid-nitrogen temperature range and pave a new way for realizing high-temperature topological superconductivity at atmospheric pressure.
Collapse
Affiliation(s)
- Chong Tian
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University Yangtze Delta Institute of Optoelectronics, Peking University, Beijing 100871, China.
| | - Yao-Hui Zhu
- Physics Department, Beijing Technology and Business University, Beijing 100048, China.
| | - Juan Du
- Department of Physics and Optoelectronic Engineering Faculty of Science, Beijing University of Technology, Beijing 100124, China
| | - Hong-Xia Zhong
- School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China
| | - Jing Lu
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University Yangtze Delta Institute of Optoelectronics, Peking University, Beijing 100871, China.
| | - Xinqiang Wang
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University Yangtze Delta Institute of Optoelectronics, Peking University, Beijing 100871, China.
| | - Jun-Jie Shi
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University Yangtze Delta Institute of Optoelectronics, Peking University, Beijing 100871, China.
| |
Collapse
|
4
|
Shan P, Ma L, Yang X, Li M, Liu Z, Hou J, Jiang S, Zhang L, Shi L, Yang P, Lin C, Wang B, Sun J, Guo H, Ding Y, Gou H, Zhao Z, Cheng J. Molecular Hydride Superconductor BiH 4 with Tc up to 91 K at 170 GPa. J Am Chem Soc 2025; 147:4375-4381. [PMID: 39711192 DOI: 10.1021/jacs.4c15137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2024]
Abstract
In pursuit of high-Tc hydride superconductors, the molecular hydrides have attracted less attention because the hydrogen quasimolecules are usually inactive for superconductivity. Here, we report on the successful synthesis of a novel bismuth hydride superconductor C2/c-BiH4 at pressures around 170-180 GPa. Its structure comprises bismuth atoms and elongated hydrogen molecules with a H-H bond length of 0.81 Å at 170 GPa, characterizing it as a typical molecular hydride. Transport measurements revealed the occurrence of superconductivity with Tc up to 91 K at 170 GPa, as evidenced by a sharp drop of resistivity to zero and a characteristic downward shift of Tc under magnetic fields. Calculations by density functional theory elucidate that both midfrequency H-derived phonons and low-frequency vibrations from Bi atoms are important for the strong electron-phonon coupling in BiH4, differentiating it from most high-Tc superconducting hydrides. Our work not only places C2/c-BiH4 among the molecular hydride superconductors with the highest Tc but also offers new directions for designing and synthesizing more high-Tc hydride superconductors.
Collapse
Affiliation(s)
- Pengfei Shan
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Liang Ma
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Key Laboratory of Materials Physics, Ministry of Education, School of Physics, Zhengzhou University, Zhengzhou 450001, China
- Institute of Quantum Materials and Physics, Henan Academy of Sciences, Zhengzhou 450046, China
| | - Xin Yang
- Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
| | - Mei Li
- Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
| | - Ziyi Liu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Jun Hou
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Sheng Jiang
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai 201204, China
| | - LiLi Zhang
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai 201204, China
| | - Lifen Shi
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Pengtao Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Chuanlong Lin
- Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
| | - Bosen Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Jianping Sun
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Haizhong Guo
- Key Laboratory of Materials Physics, Ministry of Education, School of Physics, Zhengzhou University, Zhengzhou 450001, China
- Institute of Quantum Materials and Physics, Henan Academy of Sciences, Zhengzhou 450046, China
| | - Yang Ding
- Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
| | - Huiyang Gou
- Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
| | - Zhongxian Zhao
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Jinguang Cheng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
| |
Collapse
|
5
|
Novoa T, di Mauro ME, Inostroza D, El Haloui K, Sisourat N, Maday Y, Contreras-García J. TcESTIME: predicting high-temperature hydrogen-based superconductors. Chem Sci 2024; 16:57-68. [PMID: 39600496 PMCID: PMC11587144 DOI: 10.1039/d4sc04465g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2024] [Accepted: 11/06/2024] [Indexed: 11/29/2024] Open
Abstract
Superconductivity can be considered among the most exciting discoveries in material science of the 20th century. However, the hard conditions for the synthesis and the difficult characterization, make the statement of new high critical temperature (T c) complex from the experimental viewpoint and have recently led to several hot controversies in the literature. In this panorama, theory has become a trustworthy diagnosis. Nevertheless, this comes at an extremely high computational cost. A faster alternative would be to find cheap footprints of superconductivity from the electronic structure. Some of the authors have recently shown that a correlation exists between T c, the networking value [Nature Communications, 12, 5381 (2021)], and the molecularity index [arXiv:2403.07584v1 (2024)]. The networking value reflects the metallicity of the parent compound as a measure of its electron delocalization channels, by means of the Electron Localization Function topology (its bifurcation trees). Instead, the molecularity index quantifies the presence of H2 molecules within the system. All in all, these two quantities characterize bonding features that are related to high T c: high metallicity and low molecularity boost high T c states. However, the quantification or these bonding characteristics was initially made by a visual approach, which is not scalable for high throughput screening. We have developed a new code, TcESTIME, which allows to determine the networking value for a given hydrogen-based compound. In this contribution, we present such code and the underlying periodic algorithms we have developed. As a reference, the estimation of T c for LaH10 thanks to this new code amounts to 10 CPU minutes in a computer cluster equipped with Intel Xeon 2.4 GHz processor. Given the new potential for screening, we have applied it to a larger set including ternary hydrogen based superconductors, and have proposed new fits to estimate T c, leading to errors of ca. 33 K. We believe that this contribution settles the bases for an automatic high-throughput screening of hydrogen-based superconductors.
Collapse
Affiliation(s)
- Trinidad Novoa
- Laboratoire de Chimie Théorique (LCT), Sorbonne Université, CNRS 4 Pl. Jussieu Paris 75005 France
- Sorbonne Université, Université Paris Cité, CNRS, Inria, Laboratoire Jacques-Louis Lions (LJLL) Paris 75005 France
| | - Matías E di Mauro
- Laboratoire de Chimie Théorique (LCT), Sorbonne Université, CNRS 4 Pl. Jussieu Paris 75005 France
| | - Diego Inostroza
- Laboratoire de Chimie Théorique (LCT), Sorbonne Université, CNRS 4 Pl. Jussieu Paris 75005 France
| | - Kaoutar El Haloui
- Laboratoire de Chimie Physique-Matière et Rayonnement (LCPMR), Sorbonne Université, CNRS 4 Pl. Jussieu Paris 75005 France
| | - Nicolas Sisourat
- Laboratoire de Chimie Physique-Matière et Rayonnement (LCPMR), Sorbonne Université, CNRS 4 Pl. Jussieu Paris 75005 France
| | - Yvon Maday
- Sorbonne Université, Université Paris Cité, CNRS, Inria, Laboratoire Jacques-Louis Lions (LJLL) Paris 75005 France
| | - Julia Contreras-García
- Laboratoire de Chimie Théorique (LCT), Sorbonne Université, CNRS 4 Pl. Jussieu Paris 75005 France
| |
Collapse
|
6
|
Muriel WA, Novoa T, Cárdenas C, Contreras-García J. Introducing electron correlation in solid-state calculations for superconducting states. Faraday Discuss 2024; 254:598-611. [PMID: 39212071 DOI: 10.1039/d4fd00073k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
Analyzing the electronic localization of superconductors has been recently shown to be relevant for understanding their critical temperature [Nature Communications, 12, 5381, (2021)]. However, these relationships have only been shown at the Kohn-Sham density functional theory (DFT) level, where the onset of strong correlation linked to the superconducting state is missing. In this contribution, we approximate the superconducting gap in order to reconstruct the superconducting the one-reduced density matrix (1RDM) from a DFT calculation. This allows us to analyse the electron density and localization in the strong correlation regime. The method is applied to two well-known superconductors. Electron localization features along the electron-phonon coupling directions and hydrogen cluster formations are observed for different solids. However, in both cases we see that the overall localization channels are not affected by the onset of superconductivity, explaining the ability of DFT localization channels to characterize the superconducting ones.
Collapse
Affiliation(s)
- Wilver A Muriel
- Departamento de Física, Facultad de Ciencias, Universidad de Chile, Chile
- Centro para el Desarrollo de la Nanociencia y la Nanotecnología (CEDENNA), RM 9170124, Santiago, Chile
| | - Trinidad Novoa
- Laboratoire de Chimie Théorique, Sorbonne Université, CNRS, 4 Pl. Jussieu, 75005, Paris, France.
| | - Carlos Cárdenas
- Departamento de Física, Facultad de Ciencias, Universidad de Chile, Chile
| | - Julia Contreras-García
- Laboratoire de Chimie Théorique, Sorbonne Université, CNRS, 4 Pl. Jussieu, 75005, Paris, France.
| |
Collapse
|
7
|
Denchfield A, Park H, Hemley RJ. Designing multicomponent hydrides with potential high T c superconductivity. Proc Natl Acad Sci U S A 2024; 121:e2413096121. [PMID: 39485794 PMCID: PMC11551333 DOI: 10.1073/pnas.2413096121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2024] [Accepted: 09/30/2024] [Indexed: 11/03/2024] Open
Abstract
While hydrogen-rich materials have been demonstrated to exhibit high Tc superconductivity at high pressures, there is an ongoing search for ternary, quaternary, and more chemically complex hydrides that achieve such high critical temperatures at much lower pressures. First-principles searches are impeded by the computational complexity of solving the Eliashberg equations for large, complex crystal structures. Here, we adopt a simplified approach using electronic indicators previously established to be correlated with superconductivity in hydrides. This is used to study complex hydride structures, which are predicted to exhibit promisingly high critical temperatures for superconductivity. In particular, we propose three classes of hydrides inspired by the Fm[Formula: see text]m RH[Formula: see text] structures that exhibit strong hydrogen network connectivity, as defined through the electron localization function. The first class [RH[Formula: see text]X[Formula: see text]Y] is based on a Pm[Formula: see text]m structure showing moderately high Tc, where the Tc estimate from electronic properties is compared with direct Eliashberg calculations and found to be surprisingly accurate. The second class of structures [(RH[Formula: see text])[Formula: see text]X[Formula: see text]YZ] improves on this with promisingly high density of states with dominant hydrogen character at the Fermi energy, typically enhancing Tc. The third class [(R[Formula: see text]H[Formula: see text])(R[Formula: see text]H[Formula: see text])X[Formula: see text]YZ] improves the strong hydrogen network connectivity by introducing anisotropy in the hydrogen network through a specific doping pattern. These design principles and associated model structures provide flexibility to optimize both Tc and the structural stability of complex hydrides.
Collapse
Affiliation(s)
- Adam Denchfield
- Department of Physics, University of Illinois Chicago, Chicago, IL60607
| | - Hyowon Park
- Department of Physics, University of Illinois Chicago, Chicago, IL60607
- Materials Science Division, Argonne National Laboratory, Lemont, IL60439
| | - Russell J. Hemley
- Department of Physics, University of Illinois Chicago, Chicago, IL60607
- Department of Chemistry, University of Illinois Chicago, Chicago, IL60607
- Department of Earth and Environmental Sciences, University of Illinois Chicago, Chicago, IL60607
| |
Collapse
|
8
|
Akinpelu A, Bhullar M, Yao Y. Discovery of novel materials through machine learning. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:453001. [PMID: 39106893 DOI: 10.1088/1361-648x/ad6bdb] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Accepted: 08/06/2024] [Indexed: 08/09/2024]
Abstract
Experimental exploration of new materials relies heavily on a laborious trial-and-error approach. In addition to substantial time and resource requirements, traditional experiments and computational modelling are typically limited in finding target materials within the enormous chemical space. Therefore, creating innovative techniques to expedite material discovery becomes essential. Recently, machine learning (ML) has emerged as a valuable tool for material discovery, garnering significant attention due to its remarkable advancements in prediction accuracy and time efficiency. This rapidly developing computational technique accelerates the search and optimization process and enables the prediction of material properties at a minimal computational cost, thereby facilitating the discovery of novel materials. We provide a comprehensive overview of recent studies on discovering new materials by predicting materials and their properties using ML techniques. Beginning with an introduction of the fundamental principles of ML methods, we subsequently examine the current research landscape on the applications of ML in predicting material properties that lead to the discovery of novel materials. Finally, we discuss challenges in employing ML within materials science, propose potential solutions, and outline future research directions.
Collapse
Affiliation(s)
- Akinwumi Akinpelu
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Mangladeep Bhullar
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Yansun Yao
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| |
Collapse
|
9
|
Zhao W, Huang X, Zhang Z, Chen S, Du M, Duan D, Cui T. Superconducting ternary hydrides: progress and challenges. Natl Sci Rev 2024; 11:nwad307. [PMID: 38883295 PMCID: PMC11173187 DOI: 10.1093/nsr/nwad307] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 10/29/2023] [Accepted: 10/29/2023] [Indexed: 06/18/2024] Open
Abstract
Since the discovery of the high-temperature superconductors H3S and LaH10 under high pressure, compressed hydrides have received extensive attention as promising candidates for room-temperature superconductors. As a result of current high-pressure theoretical and experimental studies, it is now known that almost all the binary hydrides with a high superconducting transition temperature (T c) require extremely high pressure to remain stable, hindering any practical application. In order to further lower the stable pressure and improve superconductivity, researchers have started exploring ternary hydrides and had many achievements in recent years. Here, we discuss recent progress in ternary hydrides, aiming to deepen the understanding of the key factors regulating the structural stability and superconductivity of ternary hydrides, such as structural motifs, bonding features, electronic structures, electron-phonon coupling, etc. Furthermore, the current issues and challenges of superconducting ternary hydrides are presented, together with the prospects and opportunities for future research.
Collapse
Affiliation(s)
- Wendi Zhao
- Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Xiaoli Huang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Zihan Zhang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Su Chen
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Mingyang Du
- Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Defang Duan
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Tian Cui
- Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| |
Collapse
|
10
|
Li X, Guo Z, Zhang X, Yang G. Layered Hydride LiH 4 with a Pressure-Insensitive Superconductivity. Inorg Chem 2024; 63:8257-8263. [PMID: 38662198 DOI: 10.1021/acs.inorgchem.4c00520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
For hydride superconductors, each significant advance is built upon the discovery of novel H-based structural units, which in turn push the understanding of the superconducting mechanism to new heights. Based on first-principles calculations, we propose a metastable LiH4 with a wavy H layer composed of the edge-sharing pea-like H18 rings at high pressures. Unexpectedly, it exhibits pressure-insensitive superconductivity manifested by an extremely small pressure coefficient (dTc/dP) of 0.04 K/GPa. This feature is attributed to the slightly weakened electron-phonon coupling with pressure, caused by the reduced charge transfer from Li atoms to wavy H layers, significantly suppressing the substantial increase in the contribution of phonons to Tc. Its superconductivity originates from the strong coupling between the H 1s electrons and the high-frequency phonons associated with the H layer. Our study extends the list of H-based structural units and enhances the in-depth understanding of pressure-related superconductivity.
Collapse
Affiliation(s)
- Xing Li
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Zixuan Guo
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Xiaohua Zhang
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Guochun Yang
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| |
Collapse
|
11
|
Wines D, Choudhary K. Data-driven Design of High Pressure Hydride Superconductors using DFT and Deep Learning. MATERIALS FUTURES 2024; 3:10.1088/2752-5724/ad4a94. [PMID: 38841205 PMCID: PMC11151870 DOI: 10.1088/2752-5724/ad4a94] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
The observation of superconductivity in hydride-based materials under ultrahigh pressures (for example, H3S and LaH10) has fueled the interest in a more data-driven approach to discovering new high-pressure hydride superconductors. In this work, we performed density functional theory (DFT) calculations to predict the critical temperature (Tc) of over 900 hydride materials under a pressure range of (0 to 500) GPa, where we found 122 dynamically stable structures with a Tc above MgB2 (39 K). To accelerate screening, we trained a graph neural network (GNN) model to predict Tc and demonstrated that a universal machine learned force-field can be used to relax hydride structures under arbitrary pressures, with significantly reduced cost. By combining DFT and GNNs, we can establish a more complete map of hydrides under pressure.
Collapse
Affiliation(s)
- Daniel Wines
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Kamal Choudhary
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| |
Collapse
|
12
|
Dogan M, Chelikowsky JR, Cohen ML. Anisotropy and isotope effect in superconducting solid hydrogen. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 36:01LT01. [PMID: 37751761 DOI: 10.1088/1361-648x/acfd79] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 09/26/2023] [Indexed: 09/28/2023]
Abstract
Elucidating the phase diagram of solid hydrogen is a key objective in condensed matter physics. Several decades ago, it was proposed that at low temperatures and high pressures, solid hydrogen would be a metal with a high superconducting transition temperature. This transition to a metallic state can happen through the closing of the energy gap in the molecular solid or through a transition to an atomic solid. Recent experiments have managed to reach pressures in the range of 400-500 GPa, providing valuable insights. There is strong evidence suggesting that metallization via either of these mechanisms occurs within this pressure range. Computational and experimental studies have identified multiple promising crystal phases, but the limited accuracy of calculations and the limited capabilities of experiments prevent us from determining unequivocally the observed phase or phases. Therefore, it is crucial to investigate the superconducting properties of all the candidate phases. Recently, we reported the superconducting properties of theC2/c-24,Cmca-12,Cmca-4 andI41/amd-2 phases, including anharmonic effects. Here, we report the effects of anisotropy on superconducting properties using Eliashberg theory. Then, we investigate the superconducting properties of deuterium and estimate the size of the isotope effect for each phase. We find that the isotope effect on superconductivity is diminished by anharmonicity in theC2/c-24 andCmca-12 phases and enlarged in theCmca-4 andI41/amd-2 phases. Our anharmonic calculations of theC2/c-24 phase of deuterium agree closely with the most recent experiment by Loubeyreet al(2022Phys. Rev. Lett.29035501), indicating that theC2/c-24 phase remains the leading candidate in this pressure range, and has a strong anharmonic character. These characteristics can serve to distinguish among crystal phases in experiment. Furthermore, expanding our understanding of superconductivity in pure hydrogen holds significance in the study of high-Tchydrides.
Collapse
Affiliation(s)
- Mehmet Dogan
- Center for Computational Materials, Oden Institute for Computational Engineering and Sciences, University of Texas at Austin, Austin, TX 78712, United States of America
- Department of Physics, University of California, Berkeley, CA 94720, United States of America
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
| | - James R Chelikowsky
- Center for Computational Materials, Oden Institute for Computational Engineering and Sciences, University of Texas at Austin, Austin, TX 78712, United States of America
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, TX 78712, United States of America
- Department of Physics, University of Texas at Austin, Austin, TX 78712, United States of America
| | - Marvin L Cohen
- Department of Physics, University of California, Berkeley, CA 94720, United States of America
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
| |
Collapse
|
13
|
Tao YL, Zeng W, Gao J, Liu ZT, Jiao Z, Liu QJ. Composition and structural characteristics of compressed alkaline earth metal hydrides. Phys Chem Chem Phys 2023; 25:26225-26235. [PMID: 37740369 DOI: 10.1039/d3cp03134a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/24/2023]
Abstract
The metallization of alkaline earth metal hydrides offers a way to achieve near-room temperature superconductivity. In order to explore the metallization mechanism of these hydrides under pressure, a detailed understanding of the property changes of alkaline earth metal hydrides is required. Based on first-principles calculations, we have systematically investigated the dihydrides (XH2, X = Be, Mg, Ca, Sr, Ba) and tetrahydrides (XH4, X = Mg, Ca, Sr, Ba) of alkaline earth metals, respectively. By applying external pressure, we show that the structures of these alkaline earth metal hydrides undergo a series of phase transitions. Moreover, we investigate how the size of the bandgap decreases and eventually closes and reveal the role of electronegativity of metal elements in the critical pressure of hydride metallization. Remarkably, the hydrogen units (H6 or H8) formed in XH4 can accelerate the metallization process. The increase of the energy level difference in hydrogen units promotes the electroacoustic coupling effect, which is conducive to realization of high superconducting transition temperature (Tc). Our theoretical findings identify MgH4-I4/mmm as having potential to be a high-temperature superconductor and provide unusual ideas for the search of unknown high-temperature superconducting materials.
Collapse
Affiliation(s)
- Ya-Le Tao
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
| | - Wei Zeng
- Teaching and Research Group of Chemistry, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 610075, People's Republic of China
| | - Juan Gao
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
| | - Zheng-Tang Liu
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
| | - Zhen Jiao
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
| | - Qi-Jun Liu
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.
| |
Collapse
|
14
|
Troyan IA, Semenok DV, Ivanova AG, Sadakov AV, Zhou D, Kvashnin AG, Kruglov IA, Sobolevskiy OA, Lyubutina MV, Perekalin DS, Helm T, Tozer SW, Bykov M, Goncharov AF, Pudalov VM, Lyubutin IS. Non-Fermi-Liquid Behavior of Superconducting SnH 4. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303622. [PMID: 37626451 PMCID: PMC10602579 DOI: 10.1002/advs.202303622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 07/18/2023] [Indexed: 08/27/2023]
Abstract
The chemical interaction of Sn with H2 by X-ray diffraction methods at pressures of 180-210 GPa is studied. A previously unknown tetrahydride SnH4 with a cubic structure (fcc) exhibiting superconducting properties below TC = 72 K is obtained; the formation of a high molecular C2/m-SnH14 superhydride and several lower hydrides, fcc SnH2 , and C2-Sn12 H18 , is also detected. The temperature dependence of critical current density JC (T) in SnH4 yields the superconducting gap 2Δ(0) = 21.6 meV at 180 GPa. SnH4 has unusual behavior in strong magnetic fields: B,T-linear dependences of magnetoresistance and the upper critical magnetic field BC2 (T) ∝ (TC - T). The latter contradicts the Wertheimer-Helfand-Hohenberg model developed for conventional superconductors. Along with this, the temperature dependence of electrical resistance of fcc SnH4 in non-superconducting state exhibits a deviation from what is expected for phonon-mediated scattering described by the Bloch-Grüneisen model and is beyond the framework of the Fermi liquid theory. Such anomalies occur for many superhydrides, making them much closer to cuprates than previously believed.
Collapse
Affiliation(s)
- Ivan A. Troyan
- Shubnikov Institute of CrystallographyFederal Scientific Research Center Crystallography and PhotonicsRussian Academy of Sciences59 Leninsky ProspektMoscow119333Russia
| | - Dmitrii V. Semenok
- Center for High Pressure Science and Technology Advanced Research (HPSTAR)Beijing100193China
| | - Anna G. Ivanova
- Shubnikov Institute of CrystallographyFederal Scientific Research Center Crystallography and PhotonicsRussian Academy of Sciences59 Leninsky ProspektMoscow119333Russia
| | - Andrey V. Sadakov
- V. L. Ginzburg Center for High‐Temperature Superconductivity and Quantum Materials P. N. Lebedev Physical InstituteRussian Academy of SciencesMoscow119991Russia
| | - Di Zhou
- Center for High Pressure Science and Technology Advanced Research (HPSTAR)Beijing100193China
| | - Alexander G. Kvashnin
- Skolkovo Institute of Science and TechnologyBolshoy Boulevard, 30/1Moscow121205Russia
| | - Ivan A. Kruglov
- Center for Fundamental and Applied ResearchDukhov Research Institute of Automatics (VNIIA)st. Sushchevskaya, 22Moscow127055Russia
- Laboratory of Computational Materials DiscoveryMoscow Institute of Physics and Technology9 Institutsky LaneDolgoprudny141700Russia
| | - Oleg A. Sobolevskiy
- V. L. Ginzburg Center for High‐Temperature Superconductivity and Quantum Materials P. N. Lebedev Physical InstituteRussian Academy of SciencesMoscow119991Russia
| | - Marianna V. Lyubutina
- Shubnikov Institute of CrystallographyFederal Scientific Research Center Crystallography and PhotonicsRussian Academy of Sciences59 Leninsky ProspektMoscow119333Russia
| | - Dmitry S. Perekalin
- A.N. Nesmeyanov Institute of Organoelement CompoundsRussian Academy of Sciences28 Vavilova str.Moscow119334Russia
| | - Toni Helm
- Hochfeld‐Magnetlabor Dresden (HLD‐EMFL) and Würzburg‐Dresden Cluster of ExcellenceHelmholtz‐Zentrum Dresden‐Rossendorf (HZDR)01328DresdenGermany
| | - Stanley W. Tozer
- National High Magnetic Field LaboratoryFlorida State UniversityTallahasseeFlorida32310USA
| | - Maxim Bykov
- Institute of Inorganic ChemistryUniversity of Cologne50939CologneGermany
| | - Alexander F. Goncharov
- Earth and Planets LaboratoryCarnegie Institution for Science5241 Broad Branch Road NWWashingtonDC20015USA
| | - Vladimir M. Pudalov
- V. L. Ginzburg Center for High‐Temperature Superconductivity and Quantum Materials P. N. Lebedev Physical InstituteRussian Academy of SciencesMoscow119991Russia
- HSE Tikhonov Moscow Institute of Electronics and Mathematics National Research University Higher School of Economics20 Myasnitskaya ulitsaMoscow101000Russia
| | - Igor S. Lyubutin
- Shubnikov Institute of CrystallographyFederal Scientific Research Center Crystallography and PhotonicsRussian Academy of Sciences59 Leninsky ProspektMoscow119333Russia
| |
Collapse
|
15
|
Marqués M, Peña-Alvarez M, Martínez-Canales M, Ackland GJ. H 2 Chemical Bond in a High-Pressure Crystalline Environment. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:15523-15532. [PMID: 37583438 PMCID: PMC10424234 DOI: 10.1021/acs.jpcc.3c02366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Revised: 07/13/2023] [Indexed: 08/17/2023]
Abstract
We show that the hydrogen in metal superhydride compounds can adopt two distinct states-atomic and molecular. At low pressures, the maximum number of atomic hydrogens is typically equal to the valency of the cation; additional hydrogens pair to form molecules with electronic states far below the Fermi energy causing low-symmetry structures with large unit cells. At high pressures, molecules become unstable, and all hydrogens become atomic. This study uses density functional theory, adopting BaH4 as a reference compound, which is compared with other stoichiometries and other cations. Increased temperature and zero-point motion also favor high-symmetry atomic states, and picosecond-timescale breaking and remaking of the bond permutations via intermediate H3- units.
Collapse
Affiliation(s)
- Miriam Marqués
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, U.K
| | - Miriam Peña-Alvarez
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, U.K
| | - Miguel Martínez-Canales
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, U.K
| | - Graeme J Ackland
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, U.K
| |
Collapse
|
16
|
Wang X, Wang Y, Wang J, Pan S, Lu Q, Wang HT, Xing D, Sun J. Pressure Stabilized Lithium-Aluminum Compounds with Both Superconducting and Superionic Behaviors. PHYSICAL REVIEW LETTERS 2022; 129:246403. [PMID: 36563263 DOI: 10.1103/physrevlett.129.246403] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 10/08/2022] [Accepted: 11/08/2022] [Indexed: 06/17/2023]
Abstract
Superconducting and superionic behaviors have physically intriguing dynamic properties of electrons and ions, respectively, both of which are conceptually important and have great potential for practical applications. Whether these two phenomena can appear in the same system is an interesting and important question. Here, using crystal structure predictions and first-principle calculations combined with machine learning, we identify several stable Li-Al compounds with electride behavior under high pressure, and we find that the electronic density of states of some of the compounds has characteristics of the two-dimensional electron gas. Among them, we estimate that Li_{6}Al at 150 GPa has a superconducting transition temperature of around 29 K and enters a superionic state at a high temperature and wide pressure range. The diffusion in Li_{6}Al is found to be affected by an electride and attributed to the atomic collective motion. Our results indicate that alkali metal alloys can be effective platforms to study the abundant physical properties and their manipulation with pressure and temperature.
Collapse
Affiliation(s)
- Xiaomeng Wang
- National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China
- School of Physics and Electronic-Electrical Engineering, Ningxia University, Yinchuan, 750021, People's Republic of China
| | - Yong Wang
- National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Junjie Wang
- National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Shuning Pan
- National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Qing Lu
- National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Hui-Tian Wang
- National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Dingyu Xing
- National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Jian Sun
- National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China
| |
Collapse
|
17
|
Bokhimi X. Effect of Pressure on the Distribution of Electrons in a Cluster of H 2S. ACS OMEGA 2022; 7:42499-42504. [PMID: 36440145 PMCID: PMC9685773 DOI: 10.1021/acsomega.2c05726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Accepted: 11/01/2022] [Indexed: 06/16/2023]
Abstract
We carry out a theoretical study of the effect of pressure on the atomic and electronic distribution of a cluster made of 155 H2S molecules. The pressure was modeled by bringing the cluster into a spherical container made of 500 helium atoms and reducing the diameter of the container. We did ab initio molecular calculations using DFT. At the lowest pressure, the S-H-S angle between two neighboring H2S molecules has a distribution with a mean value of 167.1°. This angle will be shorter as pressure increases, reaching a distribution with a mean value of 125.5° at the highest pressure. Changes in this angle result from a strong S-S interaction, displacing the H atoms from the line joining the sulfur atoms. This rearrangement of the atomic distribution generates hydrogen-rich spatial regions. We analyzed the evolution of Mulliken charges on S and H atoms in the cluster with pressure, finding that electrons move from S to H atoms, suggesting that these hydrogen-rich regions should be responsible for the electrical conductivity and, consequently, also for the superconductivity in solid H2S under pressure.
Collapse
|
18
|
Sun Y, Miao M. Chemical templates that assemble the metal superhydrides. Chem 2022. [DOI: 10.1016/j.chempr.2022.10.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
19
|
Smith GA, Collings IE, Snider E, Smith D, Petitgirard S, Smith JS, White M, Jones E, Ellison P, Lawler KV, Dias RP, Salamat A. Carbon content drives high temperature superconductivity in a carbonaceous sulfur hydride below 100 GPa. Chem Commun (Camb) 2022; 58:9064-9067. [PMID: 35837875 DOI: 10.1039/d2cc03170a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a previously unobserved superconducting state of the photosynthesized carbonaceous sulfur hydride (C-S-H) system with a maximum TC of 191(1) K below 100 GPa. The properties of C-S-H are dependent on carbon content, and X-ray diffraction and simulations reveal the system remains molecular-like up to 100 GPa.
Collapse
Affiliation(s)
- G Alexander Smith
- Nevada Extreme Conditions Laboratory, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA.
- Department of Chemistry & Biochemistry, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA
| | - Ines E Collings
- Centre for X-ray Analytics, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstraße 129, 8600 Dübendorf, Switzerland
| | - Elliot Snider
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627, USA
| | - Dean Smith
- Nevada Extreme Conditions Laboratory, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA.
| | | | - Jesse S Smith
- HPCAT, X-ray Science Division, Argonne National Laboratory, Illinois 60439, USA
| | - Melanie White
- Nevada Extreme Conditions Laboratory, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA.
- Department of Physics & Astronomy, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA
| | - Elyse Jones
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627, USA
| | - Paul Ellison
- Department of Physics & Astronomy, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA
| | - Keith V Lawler
- Nevada Extreme Conditions Laboratory, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA.
| | - Ranga P Dias
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627, USA
- Department of Physics & Astronomy, University of Rochester, Rochester, New York 14627, USA
| | - Ashkan Salamat
- Nevada Extreme Conditions Laboratory, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA.
- Department of Physics & Astronomy, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA
| |
Collapse
|
20
|
Errea I. Superconducting hydrides on a quantum landscape. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:231501. [PMID: 35255480 DOI: 10.1088/1361-648x/ac5b46] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 03/07/2022] [Indexed: 06/14/2023]
Abstract
Reaching superconductivity at ambient conditions is one of the biggest scientific dreams. The discoveries in the last few years at high pressures place hydrogen-based compounds as the best candidates for making it true. As the recent history shows, first-principles calculations are expected to continue guiding the experimental quest in the right track in the coming years. Considering that ionic quantum fluctuations largely affect the crystal structure and the vibrational properties of superconducting hydrides, in many cases making them thermodynamically stable at much lower pressures than expected, it will be crucial to include such effects on the futureab initiopredictions. The prospects for low-pressure high critical-temperature compounds are wide open, even at ambient pressure.
Collapse
Affiliation(s)
- Ion Errea
- Fisika Aplikatua Saila, Gipuzkoako Ingeniaritza Eskola, University of the Basque Country (UPV/EHU), Europa Plaza 1, 20018 Donostia/San Sebastián, Spain
- Centro de Física de Materiales (CSIC-UPV/EHU), Manuel de Lardizabal pasealekua 5, 20018 Donostia/San Sebastián, Spain
- Donostia International Physics Center (DIPC), Manuel de Lardizabal pasealekua 4, 20018 Donostia/San Sebastián, Spain
| |
Collapse
|
21
|
Dogan M, Oh S, Cohen ML. High temperature superconductivity in the candidate phases of solid hydrogen. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:15LT01. [PMID: 35042192 DOI: 10.1088/1361-648x/ac4c62] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 01/18/2022] [Indexed: 06/14/2023]
Abstract
As the simplest element in nature, unraveling the phase diagram of hydrogen is a primary task for condensed matter physics. As conjectured many decades ago, in the low-temperature and high-pressure part of the phase diagram, solid hydrogen is expected to become metallic with a high superconducting transition temperature. The metallization may occur via band gap closure in the molecular solid or via a transition to the atomic solid. Recently, a few experimental studies pushed the achievable pressures into the 400-500 GPa range. There are strong indications that at some pressure in this range metallization via either of these mechanisms occurs, although there are disagreements between experimental reports. Furthermore, there are multiple good candidate crystal phases that have emerged from recent computational and experimental studies which may be realized in upcoming experiments. Therefore, it is crucial to determine the superconducting properties of these candidate phases. In a recent study, we reported the superconducting properties of theC2/c-24 phase, which we believe to be a strong candidate for metallization via band gap closure (Doganet al2022Phys. Rev. B105L020509). Here, we report the superconducting properties of theCmca-12,Cmca-4 andI41/amd-2 phases including the anharmonic effects using a Wannier function-based densek-point andq-point sampling. We find that theCmca-12 phase has a superconducting transition temperature that rises from 86 K at 400 GPa to 212 K at 500 GPa, whereas theCmca-4 andI41/amd-2 phases show a less pressure-dependent behavior with theirTcin the 74-94 K and 307-343 K ranges, respectively. These properties can be used to distinguish between crystal phases in future experiments. Understanding superconductivity in pure hydrogen is also important in the study of high-Tchydrides.
Collapse
Affiliation(s)
- Mehmet Dogan
- Department of Physics, University of California, Berkeley, CA 94720, United States of America
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
| | - Sehoon Oh
- Department of Physics, University of California, Berkeley, CA 94720, United States of America
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
| | - Marvin L Cohen
- Department of Physics, University of California, Berkeley, CA 94720, United States of America
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
| |
Collapse
|