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Shi JJ, Tian C, He Y, Liu SM, Zhu YH, Du J, Zhong HX, Wang X. A new perspective on ductile high- Tcsuperconductors under ambient pressure: few-hydrogen metal-bonded hydrides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:441501. [PMID: 39074511 DOI: 10.1088/1361-648x/ad68b3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Accepted: 07/29/2024] [Indexed: 07/31/2024]
Abstract
Superconducting materials have garnered widespread attention due to their zero-resistance characteristic and complete diamagnetism. After more than 100 years of exploration, various high-temperature superconducting materials including cuprates, nickelates, iron-based compounds, and ultra-high pressure multi-hydrides have been discovered. However, the practical application of these materials is severely hindered by their poor ductility and/or the need for high-pressure conditions to maintain structural stability. To address these challenges, we first provide a new thought to build high-temperature superconducting materials based on few-hydrogen metal-bonded hydrides under ambient pressure. We then review the related research efforts in this article. Moreover, based on the bonding type of atoms, we classify the existing important superconducting materials and propose the new concepts of pseudo-metal and quasi-metal superconductivity, which are expected to be helpful for the design of new high-temperature superconducting materials in the future.
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Affiliation(s)
- 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, People's Republic of China
| | - 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, People's Republic of China
| | - Yong He
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University Yangtze Delta Institute of Optoelectronics, Peking University, Beijing 100871, People's Republic of China
| | - Shi-Ming Liu
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University Yangtze Delta Institute of Optoelectronics, Peking University, Beijing 100871, People's Republic of China
| | - Yao-Hui Zhu
- Physics Department, Beijing Technology and Business University, Beijing 100048, People's Republic of China
| | - Juan Du
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, People's Republic of China
| | - Hong-Xia Zhong
- School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, People's Republic of 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, People's Republic of China
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2
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Wang Z, Zou C, Lin C, Luo X, Yan H, Yin C, Xu Y, Zhou X, Wang Y, Zhu J. Correlating the charge-transfer gap to the maximum transition temperature in Bi 2Sr 2Ca n-1Cu nO 2n+4+δ. Science 2023; 381:227-231. [PMID: 37440647 DOI: 10.1126/science.add3672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 06/06/2023] [Indexed: 07/15/2023]
Abstract
As the number of CuO2 layers, n, in each unit cell of a cuprate family increases, the maximum transition temperature (Tc,max) exhibits a universal bell-shaped curve with a peak at n = 3. The microscopic mechanism of this trend remains elusive. In this study, we used advanced electron microscopy to image the atomic structure of cuprates in the Bi2Sr2Can-1CunO2n+4+δ family with 1 ≤ n ≤ 9; the evolution of the charge-transfer gap size (Δ) with n can be measured simultaneously. We determined that the n dependence of Δ follows an inverted bell-shaped curve with the minimum Δ value at n = 3. The correlation between Δ, n, and Tc,max may clarify the origin of superconductivity in cuprates.
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Affiliation(s)
- Zechao Wang
- National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, P.R. China
- Ji Hua Laboratory, Foshan, Guangdong, P.R. China
| | - Changwei Zou
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, P.R. China
| | - Chengtian Lin
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Xiangyu Luo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, P.R. China
| | - Hongtao Yan
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, P.R. China
| | - Chaohui Yin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, P.R. China
| | - Yong Xu
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, P.R. China
- New Cornerstone Science Laboratory, Frontier Science Center for Quantum Information, Beijing, P.R. China
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan
| | - Xingjiang Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, P.R. China
| | - Yayu Wang
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, P.R. China
- New Cornerstone Science Laboratory, Frontier Science Center for Quantum Information, Beijing, P.R. China
| | - Jing Zhu
- National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Key Laboratory of Advanced Materials (MOE), The State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, P.R. China
- Ji Hua Laboratory, Foshan, Guangdong, P.R. China
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3
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Wang Y, Su T, Cui Y, Ma X, Zhou X, Wang Y, Hu S, Ren W. Cuprate superconducting materials above liquid nitrogen temperature from machine learning. RSC Adv 2023; 13:19836-19845. [PMID: 37404317 PMCID: PMC10315706 DOI: 10.1039/d3ra02848h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 06/08/2023] [Indexed: 07/06/2023] Open
Abstract
The superconductivity of cuprates remains a challenging topic in condensed matter physics, and the search for materials that superconduct electricity above liquid nitrogen temperature and even at room temperature is of great significance for future applications. Nowadays, with the advent of artificial intelligence, research approaches based on data science have achieved excellent results in material exploration. We investigated machine learning (ML) models by employing separately the element symbolic descriptor atomic feature set 1 (AFS-1) and a prior physics knowledge descriptor atomic feature set 2 (AFS-2). An analysis of the manifold in the hidden layer of the deep neural network (DNN) showed that cuprates still offer the greatest potential as superconducting candidates. By calculating the SHapley Additive exPlanations (SHAP) value, it is evident that the covalent bond length and hole doping concentration emerge as the crucial factors influencing the superconducting critical temperature (Tc). These findings align with our current understanding of the subject, emphasizing the significance of these specific physical quantities. In order to improve the robustness and practicability of our model, two types of descriptors were used to train the DNN. We also proposed the idea of cost-sensitive learning, predicted the sample in another dataset, and designed a virtual high-throughput search workflow.
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Affiliation(s)
- Yuxue Wang
- Department of Physics, Material Genome Institute, Institute for the Conservation of Cultural Heritage, Shanghai University Shanghai 200444 China
- Shanghai Key Laboratory of High Temperature Superconductors, International Center for Quantum and Molecular Structures, Shanghai University Shanghai 200444 China
- Zhejiang Lab Hangzhou 311100 China
| | - Tianhao Su
- Department of Physics, Material Genome Institute, Institute for the Conservation of Cultural Heritage, Shanghai University Shanghai 200444 China
- Shanghai Key Laboratory of High Temperature Superconductors, International Center for Quantum and Molecular Structures, Shanghai University Shanghai 200444 China
- Zhejiang Lab Hangzhou 311100 China
| | - Yaning Cui
- Department of Physics, Material Genome Institute, Institute for the Conservation of Cultural Heritage, Shanghai University Shanghai 200444 China
- Shanghai Key Laboratory of High Temperature Superconductors, International Center for Quantum and Molecular Structures, Shanghai University Shanghai 200444 China
- Zhejiang Lab Hangzhou 311100 China
| | - Xianzhe Ma
- Department of Physics, Material Genome Institute, Institute for the Conservation of Cultural Heritage, Shanghai University Shanghai 200444 China
- Shanghai Key Laboratory of High Temperature Superconductors, International Center for Quantum and Molecular Structures, Shanghai University Shanghai 200444 China
- Zhejiang Lab Hangzhou 311100 China
| | - Xue Zhou
- Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University Xi'an Shaanxi 710049 China
| | - Yin Wang
- Department of Physics, Material Genome Institute, Institute for the Conservation of Cultural Heritage, Shanghai University Shanghai 200444 China
- Shanghai Key Laboratory of High Temperature Superconductors, International Center for Quantum and Molecular Structures, Shanghai University Shanghai 200444 China
- Zhejiang Lab Hangzhou 311100 China
| | - Shunbo Hu
- Department of Physics, Material Genome Institute, Institute for the Conservation of Cultural Heritage, Shanghai University Shanghai 200444 China
- Shanghai Key Laboratory of High Temperature Superconductors, International Center for Quantum and Molecular Structures, Shanghai University Shanghai 200444 China
- Zhejiang Lab Hangzhou 311100 China
| | - Wei Ren
- Department of Physics, Material Genome Institute, Institute for the Conservation of Cultural Heritage, Shanghai University Shanghai 200444 China
- Shanghai Key Laboratory of High Temperature Superconductors, International Center for Quantum and Molecular Structures, Shanghai University Shanghai 200444 China
- Zhejiang Lab Hangzhou 311100 China
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4
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On the electron pairing mechanism of copper-oxide high temperature superconductivity. Proc Natl Acad Sci U S A 2022; 119:e2207449119. [PMID: 36067325 PMCID: PMC9477408 DOI: 10.1073/pnas.2207449119] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The elementary CuO2 plane sustaining cuprate high-temperature superconductivity occurs typically at the base of a periodic array of edge-sharing CuO5 pyramids. Virtual transitions of electrons between adjacent planar Cu and O atoms, occurring at a rate t/ℏ and across the charge-transfer energy gap [Formula: see text], generate "superexchange" spin-spin interactions of energy [Formula: see text] in an antiferromagnetic correlated-insulator state. However, hole doping this CuO2 plane converts this into a very-high-temperature superconducting state whose electron pairing is exceptional. A leading proposal for the mechanism of this intense electron pairing is that, while hole doping destroys magnetic order, it preserves pair-forming superexchange interactions governed by the charge-transfer energy scale [Formula: see text]. To explore this hypothesis directly at atomic scale, we combine single-electron and electron-pair (Josephson) scanning tunneling microscopy to visualize the interplay of [Formula: see text] and the electron-pair density nP in Bi2Sr2CaCu2O8+x. The responses of both [Formula: see text] and nP to alterations in the distance δ between planar Cu and apical O atoms are then determined. These data reveal the empirical crux of strongly correlated superconductivity in CuO2, the response of the electron-pair condensate to varying the charge-transfer energy. Concurrence of predictions from strong-correlation theory for hole-doped charge-transfer insulators with these observations indicates that charge-transfer superexchange is the electron-pairing mechanism of superconductive Bi2Sr2CaCu2O8+x.
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5
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Islam MS, Howlader AH, Zheng R, Stampfl C, Park J, Hashimoto A. Localization of the Optical Phonon Modes in Boron Nitride Nanotubes: Mixing Effect of 10B Isotopes and Vacancies. ACS OMEGA 2022; 7:26591-26600. [PMID: 35936430 PMCID: PMC9352326 DOI: 10.1021/acsomega.2c02792] [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: 05/05/2022] [Accepted: 07/07/2022] [Indexed: 06/15/2023]
Abstract
We explored the mixing effect of 10B isotopes and boron (B) or nitrogen (N) vacancies on the atomic vibrational properties of (10,0) single-wall boron nitride nanotubes (BNNTs). The forced oscillation technique was employed to evaluate the phonon modes for the entire range (0-100%) of 10B isotopes and atomic vacancy densities ranging from 0 to 30%. With increasing isotope densities, we noticed a blue shift of the Raman-active A1 phonon peak, whereas an increased density of mixed or independent B and N vacancies resulted in the emergence of a new low-frequency peak and the annihilation of the A1 peak in the phonon density of states. High-energy optical phonons were localized as a result of both 10B isotopes and the presence of mixing defects. We found an asymmetrical nature of the localization length with increasing 10B isotope content, which corresponds well to the isotope-inherited localization length of carbon nanotubes and monolayer graphene. The localization length falls abruptly with the increase in concentration of both atomic vacancies (B or N) and mixing defects (10B isotope and vacancies). These findings are critical for understanding heat conduction and nanoscopic vibrational investigations such as tip-enhanced Raman spectra in BNNTs, which can map local phonon energies.
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Affiliation(s)
- Md. Sherajul Islam
- Department
of Electrical and Electronic Engineering, Khulna University of Engineering and Technology, Khulna 9203, Bangladesh
- Department
of Electrical and Biomedical Engineering, University of Nevada, Reno, Nevada 89557, United States
| | | | - Rongkun Zheng
- School
of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Catherine Stampfl
- School
of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Jeongwon Park
- School
of Electrical Engineering and Computer Science, University of Ottawa, Ottawa ON K1N 6N5, Canada
- Department
of Electrical and Biomedical Engineering, University of Nevada, Reno, Nevada 89557, United States
| | - Akihiro Hashimoto
- Graduate
School of Engineering, University of Fukui, Fukui 910-8507, Japan
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6
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Superconductivity and the Jahn–Teller Polaron. CONDENSED MATTER 2022. [DOI: 10.3390/condmat7010010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In this article, we review the essential properties of high-temperature superconducting cuprates, which are unconventional isotope effects, heterogeneity, and lattice responses. Since their discovery was based on ideas stemming from Jahn–Teller polarons, their special role, together with the Jahn–Teller effect itself, is discussed in greater detail. We conclude that the underlying physics of cuprates cannot stem from purely electronic mechanisms, but that the intricate interaction between lattice and charge is at its origin.
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7
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Bussmann-Holder A, Keller H. High-temperature superconductors: underlying physics and applications. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2019. [DOI: 10.1515/znb-2019-0103] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Superconductivity was discovered in 1911 by Kamerlingh Onnes and Holst in mercury at the temperature of liquid helium (4.2 K). It took almost 50 years until in 1957 a microscopic theory of superconductivity, the so-called BCS theory, was developed. Since the discovery a number of superconducting materials were found with transition temperatures up to 23 K. A breakthrough in the field happened in 1986 when Bednorz and Müller discovered a new class of superconductors, the so-called cuprate high-temperature superconductors with transition temperatures as high as 135 K. This surprising discovery initiated new efforts with respect to fundamental physics, material science, and technological applications. In this brief review the basic physics of the conventional low-temperature superconductors as well as of the high-temperature superconductors are presented with a brief introduction to applications exemplified from high-power to low-power electronic devices. Finally, a short outlook and future challenges are presented, finished with possible imaginations for applications of room-temperature superconductivity.
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Affiliation(s)
- Annette Bussmann-Holder
- Max-Planck Institute for Solid State Research , Heisenbergstrasse 1 , D-70569 Stuttgart , Germany
| | - Hugo Keller
- Physik-Institut der Universität Zürich , Winterthurerstrasse 190 , CH-8057 Zürich , Switzerland
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8
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Durajski AP, Szczȩśniak R. Structural, electronic, vibrational, and superconducting properties of hydrogenated chlorine. J Chem Phys 2018; 149:074101. [DOI: 10.1063/1.5031202] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Affiliation(s)
- Artur P. Durajski
- Institute of Physics, Czȩstochowa University of Technology, Ave. Armii Krajowej 19, 42-200 Czȩstochowa, Poland
| | - Radosław Szczȩśniak
- Institute of Physics, Czȩstochowa University of Technology, Ave. Armii Krajowej 19, 42-200 Czȩstochowa, Poland
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9
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Ruan W, Hu C, Zhao J, Cai P, Peng Y, Ye C, Yu R, Li X, Hao Z, Jin C, Zhou X, Weng ZY, Wang Y. Relationship between the parent charge transfer gap and maximum transition temperature in cuprates. Sci Bull (Beijing) 2016. [DOI: 10.1007/s11434-016-1204-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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10
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Pines D. Emergent behavior in strongly correlated electron systems. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2016; 79:092501. [PMID: 27484183 DOI: 10.1088/0034-4885/79/9/092501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
I describe early work on strongly correlated electron systems (SCES) from the perspective of a theoretical physicist who, while a participant in their reductionist top-down beginnings, is now part of the paradigm change to a bottom-up 'emergent' approach with its focus on using phenomenology to find the organizing principles responsible for their emergent behavior disclosed by experiment-and only then constructing microscopic models that incorporate these. After considering the organizing principles responsible for the emergence of plasmons, quasiparticles, and conventional superconductivity in SCES, I consider their application to three of SCES's sister systems, the helium liquids, nuclei, and the nuclear matter found in neutron stars. I note some recent applications of the random phase approximation and examine briefly the role that paradigm change is playing in two central problems in our field: understanding the emergence and subsequent behavior of heavy electrons in Kondo lattice materials; and finding the mechanism for the unconventional superconductivity found in heavy electron, organic, cuprate, and iron-based materials.
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Affiliation(s)
- David Pines
- Santa Fe Institute and Physics Department, U C Davis and UIUC
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11
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Guguchia Z, Khasanov R, Bendele M, Pomjakushina E, Conder K, Shengelaya A, Keller H. Negative oxygen isotope effect on the static spin stripe order in superconducting La(2-x)Ba(x)CuO(4) (x=1/8) observed by muon-spin rotation. PHYSICAL REVIEW LETTERS 2014; 113:057002. [PMID: 25126931 DOI: 10.1103/physrevlett.113.057002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Indexed: 06/03/2023]
Abstract
Large negative oxygen-isotope (^{16}O and ^{18}O) effects (OIEs) on the static spin-stripe-ordering temperature T_{so} and the magnetic volume fraction V_{m} were observed in La_{2-x}Ba_{x}CuO_{4}(x=1/8) by means of muon-spin-rotation experiments. The corresponding OIE exponents were found to be α_{T_{so}}=-0.57(6) and α_{V_{m}}=-0.71(9), which are sign reversed to α_{T_{c}}=0.46(6) measured for the superconducting transition temperature T_{c}. This indicates that the electron-lattice interaction is involved in the stripe formation and plays an important role in the competition between bulk superconductivity and static stripe order in the cuprates.
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Affiliation(s)
- Z Guguchia
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - R Khasanov
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - M Bendele
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - E Pomjakushina
- Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - K Conder
- Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - A Shengelaya
- Department of Physics, Tbilisi State University, Chavchavadze 3, GE-0128 Tbilisi, Georgia
| | - H Keller
- Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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12
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Mansart B, Lorenzana J, Mann A, Odeh A, Scarongella M, Chergui M, Carbone F. Coupling of a high-energy excitation to superconducting quasiparticles in a cuprate from coherent charge fluctuation spectroscopy. Proc Natl Acad Sci U S A 2013; 110:4539-4544. [PMCID: PMC3606993 DOI: 10.1073/pnas.1218742110] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2024] Open
Abstract
Dynamical information on spin degrees of freedom of proteins or solids can be obtained by NMR and electron spin resonance. A technique with similar versatility for charge degrees of freedom and their ultrafast correlations could move the understanding of systems like unconventional superconductors forward. By perturbing the superconducting state in a high-T c cuprate, using a femtosecond laser pulse, we generate coherent oscillations of the Cooper pair condensate that can be described by an NMR/electron spin resonance formalism. The oscillations are detected by transient broad-band reflectivity and are found to resonate at the typical scale of Mott physics (2.6 eV), suggesting the existence of a nonretarded contribution to the pairing interaction, as in unconventional (non-Migdal–Eliashberg) theories.
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Affiliation(s)
- Barbara Mansart
- Laboratory for Ultrafast Microscopy and Electron Scattering, Institute of Condensed Matter Physics, and
- Laboratory of Ultrafast Spectroscopy, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland; and
| | - José Lorenzana
- Institute for Complex Systems–Consiglio Nazionale delle Ricerche, and Physics Department, University of Rome “La Sapienza,” I-00185 Rome, Italy
| | - Andreas Mann
- Laboratory for Ultrafast Microscopy and Electron Scattering, Institute of Condensed Matter Physics, and
| | - Ahmad Odeh
- Laboratory of Ultrafast Spectroscopy, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland; and
| | - Mariateresa Scarongella
- Laboratory of Ultrafast Spectroscopy, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland; and
| | - Majed Chergui
- Laboratory of Ultrafast Spectroscopy, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland; and
| | - Fabrizio Carbone
- Laboratory of Ultrafast Spectroscopy, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland; and
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13
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Yuan GJ, Zhao SP, Wang C, Liu JL, Ren XM. Influence of isotope substitution on lattice and spin-Peierls-type transition features in one-dimensional nickel bis-dithiolene spin systems. Chem Asian J 2013; 8:611-22. [PMID: 23303568 DOI: 10.1002/asia.201200956] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Indexed: 11/07/2022]
Abstract
Four new 1D spin-Peierls-type compounds, [D(5)]1-(4'-R-benzyl)pyridinium bis(maleonitriledithiolato)nickelate ([D(5)]R-Py; R=F, I, CH(3), and NO(2)), were synthesized and characterized structurally and magnetically. These 1D compounds are isostructural with the corresponding non-deuterated compounds, 1-(4'-R-benzyl)pyridinium bis(maleonitriledithiolato)nickelate (R-Py; R=F, I, CH(3), and NO(2)). Compounds [D(5)]R-Py and R-Py (R=F, I, CH(3), and NO(2)) crystallize in the monoclinic space group P2(1)/c with uniform stacks of anions and cations in the high-temperature phase and triclinic space group P1 with dimerized stacks of anions and cations in the low-temperature phase. Similar to the non-deuterated R-Py compounds, a spin-Peierls-type transition occurs at a critical temperature for each [D(5)]R-Py compound; the magnetic character of the 1D S=1/2 ferromagnetic chain for [D(5)]F-Py and the 1D S=1/2 Heisenberg antiferromagnetic chain for others appear above the transition temperature. Spin-gap magnetic behavior was observed for all of these compounds below the transition temperature. In comparison to the corresponding R-Py compound, the cell volume is almost unchanged for [D(5)]F-Py and shows slight expansion for [D(5)]R-Py (R=I, CH(3), and NO(2)) as well as an increase in the spin-Peierls-type transition temperature for all of these 1D compounds in the order of F>I≈CH(3)≈NO(2). The large isotopic effect of nonmagnetic countercations on the spin-Peierls-type transition critical temperature, T(C), can be attributed to the change in ω(0) with isotope substitution.
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Affiliation(s)
- Guo-Jun Yuan
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Science, Nanjing University of Technology, Nanjing 210009, P. R. China
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14
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Pei WB, Wu JS, Ren XM, Tian ZF, Xie J. Observation of divergent isotope effects as well as metal ion-modulated T(C) and spin-canting nature in isostructural supramolecular magnets. Dalton Trans 2012; 41:7609-19. [PMID: 22595883 DOI: 10.1039/c2dt30215b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The ion-pair complexes of [4-NH(2)-PyH][M(mnt)(2)] (M = Pt for 1 and Ni for 3) and their deuterated analogues [4-NH(2)-PyD][M(mnt)(2)] (M = Pt for 2 and Ni for 4) are isostructural with each other. Four complexes crystalline in monoclinic space group C2/c, whose asymmetric unit consists of two halves of [M(mnt)(2)](-) anions and one cation, show quite similar cell parameters and almost identical packing structures as well. In the crystals of 1-4, two types of crystallographically inequivalent [M(mnt)(2)](-) anions construct individual layers, which are separated by the cation layer; the supramolecular networks are formed via the H-bonding interactions between the [M(mnt)(2)](-) and 4-NH(2)-PyH(+) (or 4-NH(2)-PyD(+)) ions as well as the weakly ππ stacking interactions between the [M(mnt)(2)](-) anions. The four isostructural complexes exhibit canted antiferromagnetism, arising from the non-collinearity of the magnetic moments between the crystallographically inequivalent anion layers, with T(C) ≈ 14.8 K for 1, 13.6 K for 2, 7.7 K for 3 and 8.8 K for 4, respectively. Ac magnetic susceptibility measurements revealed that 1 and 2 show spin canting, while 3 and 4 show hidden-spin canting characteristics. The isostructural 1 and 3 were deuterated to give the divergent isotope effects on the cell volume and T(C).
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Affiliation(s)
- Wen-Bo Pei
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Science, Nanjing University of Technology, Nanjing 210009, PR China
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15
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16
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Affiliation(s)
- Guo-meng Zhao
- a Physik-Institut der Universität Zürich , CH-8057 Zürich, Switzerland
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Mareš J, Hubík P, Krištofik J, Nesládek M. Selected topics related to the transport and superconductivity in boron-doped diamond. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2008; 9:044101. [PMID: 27878014 PMCID: PMC5099628 DOI: 10.1088/1468-6996/9/4/044101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2008] [Revised: 01/28/2009] [Accepted: 11/11/2008] [Indexed: 06/06/2023]
Abstract
This contribution deals with a few topics closely related to the superconductivity in the heavily boron-doped diamond which are, in our opinion, not properly treated in the current literature. Attention is paid especially to the classification of metallic and insulating state, selection of pairing mechanism, limits of weak coupling approximation and to the influence of granularity on the superconducting transition.
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Affiliation(s)
- JiříJ Mareš
- Institute of Physics of the ASCR, v. v. i., Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - Pavel Hubík
- Institute of Physics of the ASCR, v. v. i., Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - Jozef Krištofik
- Institute of Physics of the ASCR, v. v. i., Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - Miloš Nesládek
- Institute of Physics of the ASCR, v. v. i., Na Slovance 2, 182 21 Prague 8, Czech Republic
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Shigeta Y, Miyachi H, Matsui T, Hirao K. Dynamic Quantum Isotope Effects on Multiple Proton-Transfer Reactions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2008. [DOI: 10.1246/bcsj.81.1230] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Chang CW, Fennimore AM, Afanasiev A, Okawa D, Ikuno T, Garcia H, Li D, Majumdar A, Zettl A. Isotope effect on the thermal conductivity of boron nitride nanotubes. PHYSICAL REVIEW LETTERS 2006; 97:085901. [PMID: 17026316 DOI: 10.1103/physrevlett.97.085901] [Citation(s) in RCA: 129] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2006] [Indexed: 05/12/2023]
Abstract
We have measured the temperature-dependent thermal conductivity kappa(T) of individual multiwall boron nitride nanotubes using a microfabricated test fixture that allows direct transmission electron microscopy characterization of the tube being measured. kappa(T) is exceptionally sensitive to isotopic substitution, with a 50% enhancement in kappa(T) resulting for boron nitride nanotubes with 99.5% 11B. For isotopically pure boron nitride nanotubes, kappa rivals that of carbon nanotubes of similar diameter.
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Affiliation(s)
- C W Chang
- Department of Physics, University of California, Berkeley, California 94720, USA
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Masumi T. Quantum condensation in superconductivity perceived in its space–time aspects. Proc Math Phys Eng Sci 2003. [DOI: 10.1098/rspa.2002.1108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Taizo Masumi
- National Institute for Materials Science, Nano-Materials Laboratory, 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan and Department of Pure and Applied Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
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Frohlich H. Theory of the Superconducting State: II Magnetic Properties at the Absolute Zero of Temperature. ACTA ACUST UNITED AC 2002. [DOI: 10.1088/0370-1298/64/2/304] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Abstract
The one-dimensional case of free electrons interacting with lattice displacements is solved by a self-consistent method. It is found that for a certain range of the interaction parametera single sinusoidal lattice displacement is strongly excited in the lowest level of the system. Its wave-length is such as to create an energy gap in the single-electron energy spectrum with all states below it filled, and all above it empty. This periodic lattice displacement plays the role of an ‘inner field’ and leads to periodic fluctuation in the electronic density in such a way that the two stabilize each other. In an infinite medium described by a periodic boundary condition they are not fixed absolutely in space, but only relative to each other. Excitation of electrons across the gap leads to a decrease in both the electronic density fluctuations and the width of the gap. The whole system, electrons plus lattice displacements, can move through the lattice without being disturbed provided the velocity
v
is sufficiently small. The inertia of this system is equal to that of all electrons augmented by a term due to the lattice displacements. Elastic scattering of individual electrons which normally leads to the residual resistance is impossible if
v
is sufficiently small. The linear specific heat of normal electrons is eliminated and replaced by an exponential term.
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Hakioglu T, Ivanov VA, Shumovsky AS, Tanatar B. Phonon squeezing via correlations in the superconducting electron-phonon interaction. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:15363-15368. [PMID: 9978494 DOI: 10.1103/physrevb.51.15363] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Deaven DM, Rokhsar DS. Isotopic disorder in superconducting fullerenes. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:4114-4118. [PMID: 10008863 DOI: 10.1103/physrevb.48.4114] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bornemann HJ, Morris DE. Isotope effect in YBa2-xLaxCu3Oz: Evidence for phonon-mediated high-temperature superconductivity. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:5322-5325. [PMID: 9998349 DOI: 10.1103/physrevb.44.5322] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Crawford MK, Farneth WE, McCarronn EM, Harlow RL, Moudden AH. Oxygen Isotope Effect and Structural Phase Transitions in La
2
CuO
4
-Based Superconductors. Science 1990; 250:1390-4. [PMID: 17754985 DOI: 10.1126/science.250.4986.1390] [Citation(s) in RCA: 145] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The oxygen isotope effect on the superconducting transition temperature (alpha(o)) varies as a function of x in La2-xSrxCuO(4) and La2-xBaxCuO(4), with the maximum alpha(o) values (alpha(o) >/= 0.5) found for x near 0.12. This unusual x dependence implies that the isotope effect is influenced by proximity to the Abma --> P4(2)/ncm structural phase transition in these systems. Synchrotron x-ray difaction measurements reveal little change in lattice parameters or orthorhombicity due to isotope exchange in strontium-doped materials where alpha(o) > 0.5, eliminating static structural distortion as a cause of the large isotope effects. The anomalous behavior of alpha(o) in both strontium- and barium-doped materials, in combination with the previously discovered Abma --> P4(2)/ncm structural phase-transition in La(1.88)B(0.12)CuO(4), suggests that an electronic contribution to the lattice instability is present and maximizes at approximately 1/8 hole per copper atom. These observations indicate a dose connection between hole doping of the Cu-O sheets, tilting instabilities of the CuO(6) octahedra, and superconductivity in La(2)CuO(4)-based superconductors.
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Crawford MK, Kunchur MN, Farneth WE, McCarron III, Poon SJ. Anomalous oxygen isotope effect in La2-xSrxCuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:282-287. [PMID: 9992766 DOI: 10.1103/physrevb.41.282] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Hoen S, Creager WN, Bourne LC, Crommie MF, Barbee TW, Cohen ML, Zettl A, Bernardez L, Kinney J. Oxygen isotope study of YBa2Cu3O7. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:2269-2278. [PMID: 9948464 DOI: 10.1103/physrevb.39.2269] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Faltens TA, Ham WK, Keller SW, Leary KJ, Michaels JN, Stacy AM, Morris DE, Barbee III, Bourne LC, Cohen ML, Hoen S, Zettl A. Observation of an oxygen isotope shift in the superconducting transition temperature of La1.85Sr. PHYSICAL REVIEW LETTERS 1987; 59:915-918. [PMID: 10035905 DOI: 10.1103/physrevlett.59.915] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Bourne LC, Crommie MF, Zettl A, Keller SW, Leary KL, Stacy AM, Chang KJ, Cohen ML, Morris DE. Search for isotope effect in superconducting Y-Ba-Cu-O. PHYSICAL REVIEW LETTERS 1987; 58:2337-2339. [PMID: 10034719 DOI: 10.1103/physrevlett.58.2337] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Hidaka T, Oka K. Isotope effect on BaTiO3 ferroelectric phase transitions. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 35:8502-8508. [PMID: 9941201 DOI: 10.1103/physrevb.35.8502] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Batlogg B, Cava RJ, Jayaraman A, Kourouklis GA, Sunshine S, Murphy DW, Rupp LW, Chen HS, White A, Short KT, Mujsce AM, Rietman EA. Isotope effect in the high-Tc superconductors Ba2YCu3O7 and Ba2EuCu3O7. PHYSICAL REVIEW LETTERS 1987; 58:2333-2336. [PMID: 10034718 DOI: 10.1103/physrevlett.58.2333] [Citation(s) in RCA: 144] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Statistical treatment of open systems by generalized master equations. SPRINGER TRACTS IN MODERN PHYSICS 1973. [DOI: 10.1007/bfb0044957] [Citation(s) in RCA: 138] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Rowell JM, Kopf L. Tunneling Measurements of Phonon Spectra and Density of States in Superconductors. ACTA ACUST UNITED AC 1965. [DOI: 10.1103/physrev.137.a907] [Citation(s) in RCA: 78] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Giaever I, Hart HR, Megerle K. Tunneling into Superconductors at Temperatures below 1°K. ACTA ACUST UNITED AC 1962. [DOI: 10.1103/physrev.126.941] [Citation(s) in RCA: 184] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Hake RR, Mapother DE, Decker DL. Isotope Effect on the Superconducting Transition in Lead. ACTA ACUST UNITED AC 1958. [DOI: 10.1103/physrev.112.1522] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Hatton J. Effect of Pressure on Superconducting Transitions and on Electrical Resistance at Low Temperatures. ACTA ACUST UNITED AC 1956. [DOI: 10.1103/physrev.103.1167] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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