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Yang Z, Zhang L, Chisholm MF, Zhou X, Ye H, Pennycook SJ. Precipitation of binary quasicrystals along dislocations. Nat Commun 2018; 9:809. [PMID: 29476133 PMCID: PMC5824953 DOI: 10.1038/s41467-018-03250-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 01/31/2018] [Indexed: 11/08/2022] Open
Abstract
Dislocations in crystals naturally break the symmetry of the bulk, introducing local atomic configurations with symmetries such as fivefold rings. But dislocations do not usually nucleate aperiodic structure along their length. Here we demonstrate the formation of extended binary quasicrystalline precipitates with Penrose-like random-tiling structures, beginning with chemical ordering within the pentagonal structure at cores of prismatic dislocations in Mg-Zn alloys. Atomic resolution observations indicate that icosahedral chains centered along [0001] pillars of Zn interstitial atoms are formed templated by the fivefold rings at dislocation cores. They subsequently form columns of rhombic and elongated hexagonal tiles parallel to the dislocation lines. Quasicrystalline precipitates are formed by random tiling of these rhombic and hexagonal tiles. Such precipitation may impact dislocation glide and alloy strength.
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Affiliation(s)
- Zhiqing Yang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China.
- Division of Materials Science and Technology, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
| | - Lifeng Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China
| | - Matthew F Chisholm
- Division of Materials Science and Technology, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
| | - Xinzhe Zhou
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China
| | - Hengqiang Ye
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China
| | - Stephen J Pennycook
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117576, Singapore.
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Shin D, Lee Y, Sasaki M, Jeong YH, Weickert F, Betts JB, Kim HJ, Kim KS, Kim J. Violation of Ohm's law in a Weyl metal. NATURE MATERIALS 2017; 16:1096-1099. [PMID: 28805826 DOI: 10.1038/nmat4965] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Accepted: 07/07/2017] [Indexed: 06/07/2023]
Abstract
Ohm's law is a fundamental paradigm in the electrical transport of metals. Any transport signatures violating Ohm's law would give an indisputable fingerprint for a novel metallic state. Here, we uncover the breakdown of Ohm's law owing to a topological structure of the chiral anomaly in the Weyl metal phase. We observe nonlinear I-V characteristics in Bi0.96Sb0.04 single crystals in the diffusive limit, which occurs only for a magnetic-field-aligned electric field (E∥B). The Boltzmann transport theory with the charge pumping effect reveals the topological-in-origin nonlinear conductivity, and it leads to a universal scaling function of the longitudinal magnetoconductivity, which completely describes our experimental results. As a hallmark of Weyl metals, the nonlinear conductivity provides a venue for nonlinear electronics, optical applications, and the development of a topological Fermi-liquid theory beyond the Landau Fermi-liquid theory.
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Affiliation(s)
- Dongwoo Shin
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Republic of Korea
| | - Yongwoo Lee
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - M Sasaki
- Department of Physics, Faculty of Science, Yamagata University, Kojirakawa, Yamagata 990-8560, Japan
| | - Yoon Hee Jeong
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Franziska Weickert
- Florida State University, NHMFL, Tallahassee, Florida 32310, USA
- Los Alamos National Laboratory, MPA-MAG, Los Alamos, New Mexico 87545, USA
| | - Jon B Betts
- Los Alamos National Laboratory, MPA-MAG, Los Alamos, New Mexico 87545, USA
| | - Heon-Jung Kim
- Department of Physics, College of Natural Science, Daegu University, Gyeongbuk 38453, Korea
| | - Ki-Seok Kim
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Jeehoon Kim
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Republic of Korea
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