1
|
Bravo M, McCandless GT, Baumbach RE, Wang Y, Ali MN, Chan JY. Crystal Growth and Physical Properties of Hybrid CoSn-YCo 6Ge 6 Structure Type Ln xCo 3(Ge 1-ySn y) 3 (Ln = Y, Gd). Inorg Chem 2023; 62:18049-18055. [PMID: 37870243 DOI: 10.1021/acs.inorgchem.3c02172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2023]
Abstract
There is an ongoing interest in kagome materials because they offer tunable platforms at the intersection of magnetism and electron correlation. Herein, we examine single crystals of new kagome materials, LnxCo3(Ge1-ySny)3 (Ln = Y, Gd; y = 0.11, 0.133), which were produced using the Sn flux-growth method. Unlike many of the related chemical analogues with the LnM6X6 formula (M = transition metal and X = Ge, Sn), the Y and Gd analogues crystallize in a hybrid YCo6Ge6/CoSn structure, with Sn substitution. While the Y analogue displays temperature-independent paramagnetism, magnetic measurements of the Gd analogue reveal a magnetic moment of 8.48 μB, indicating a contribution from both Gd and Co. Through anisotropic magnetic measurements, the direction of Co-magnetism can be inferred to be in plane with the kagome net, as the Co contribution is only along H//a. Crystal growth and structure determination of YxCo3(Ge,Sn)3 and GdxCo3(Ge,Sn)3, two new hybrid kagome materials of the CoSn and YCo6Ge6 structure types. Magnetic properties, heat capacity, and resistivity on single crystals are reported.
Collapse
Affiliation(s)
- Moisés Bravo
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
| | - Gregory T McCandless
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
| | - Ryan E Baumbach
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Yaojia Wang
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
- Kavli Institute of Nanoscience, Delft University of Technology, Delft 2628 CJ, The Netherlands
| | - Mazhar N Ali
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
- Kavli Institute of Nanoscience, Delft University of Technology, Delft 2628 CJ, The Netherlands
| | - Julia Y Chan
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
| |
Collapse
|
2
|
Smith HJ, Nusinovich Y, Osborne IS, Vignieri S, Jiang D, Shilatifard A, Olingy C, Simonti C, Lavine MS, Yeston JS, Stajic J, Wong W, Ali MN. In Science Journals. Science 2023; 381:642-644. [PMID: 37561853 DOI: 10.1126/science.adk1876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
Highlights from the Science family of journals.
Collapse
|
3
|
Wang Y, Yang SY, Sivakumar PK, Ortiz BR, Teicher SML, Wu H, Srivastava AK, Garg C, Liu D, Parkin SSP, Toberer ES, McQueen T, Wilson SD, Ali MN. Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K 1-xV 3Sb 5. Sci Adv 2023; 9:eadg7269. [PMID: 37436976 DOI: 10.1126/sciadv.adg7269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 06/12/2023] [Indexed: 07/14/2023]
Abstract
Materials with Kagome nets are of particular importance for their potential combination of strong correlation, exotic magnetism, and electronic topology. KV3Sb5 was discovered to be a layered topological metal with a Kagome net of vanadium. Here, we fabricated Josephson Junctions of K1-xV3Sb5 and induced superconductivity over long junction lengths. Through magnetoresistance and current versus phase measurements, we observed a magnetic field sweeping direction-dependent magnetoresistance and an anisotropic interference pattern with a Fraunhofer pattern for in-plane magnetic field but a suppression of critical current for out-of-plane magnetic field. These results indicate an anisotropic internal magnetic field in K1-xV3Sb5 that influences the superconducting coupling in the junction, possibly giving rise to spin-triplet superconductivity. In addition, the observation of long-lived fast oscillations shows evidence of spatially localized conducting channels arising from edge states. These observations pave the way for studying unconventional superconductivity and Josephson device based on Kagome metals with electron correlation and topology.
Collapse
Affiliation(s)
- Yaojia Wang
- Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany
- Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
| | - Shuo-Ying Yang
- Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany
| | - Pranava K Sivakumar
- Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany
| | - Brenden R Ortiz
- Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA
| | - Samuel M L Teicher
- Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA
| | - Heng Wu
- Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany
- Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
| | - Abhay K Srivastava
- Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany
| | - Chirag Garg
- Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany
- IBM Almaden Research Center, San Jose, CA 95120, USA
| | - Defa Liu
- Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany
- Department of Physics, Beijing Normal University, Beijing 100875, China
| | - Stuart S P Parkin
- Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany
| | | | | | - Stephen D Wilson
- Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA
| | - Mazhar N Ali
- Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany
- Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
| |
Collapse
|
4
|
Malo CS, Osborne IS, Lavine MS, Hurtley SM, Ali MN, Funk MA, Kelly PN, Stern P, Scanlon ST, Vinson V, Yeston J, Smith KT, Ash C, Wong W, Olingy C, Szuromi P, Zahn LM. In Science Journals. Science 2022; 375:832-834. [PMID: 35201868 DOI: 10.1126/science.ada1393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Highlights from the Science family of journals.
Collapse
|
5
|
Shin I, Cho WJ, An ES, Park S, Jeong HW, Jang S, Baek WJ, Park SY, Yang DH, Seo JH, Kim GY, Ali MN, Choi SY, Lee HW, Kim JS, Kim SD, Lee GH. Spin-Orbit Torque Switching in an All-Van der Waals Heterostructure. Adv Mater 2022; 34:e2101730. [PMID: 34908193 DOI: 10.1002/adma.202101730] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 12/09/2021] [Indexed: 06/14/2023]
Abstract
Current-induced control of magnetization in ferromagnets using spin-orbit torque (SOT) has drawn attention as a new mechanism for fast and energy efficient magnetic memory devices. Energy-efficient spintronic devices require a spin-current source with a large SOT efficiency (ξ) and electrical conductivity (σ), and an efficient spin injection across a transparent interface. Herein, single crystals of the van der Waals (vdW) topological semimetal WTe2 and vdW ferromagnet Fe3 GeTe2 are used to satisfy the requirements in their all-vdW-heterostructure with an atomically sharp interface. The results exhibit values of ξ ≈ 4.6 and σ ≈ 2.25 × 105 Ω-1 m-1 for WTe2 . Moreover, the significantly reduced switching current density of 3.90 × 106 A cm-2 at 150 K is obtained, which is an order of magnitude smaller than those of conventional heavy-metal/ferromagnet thin films. These findings highlight that engineering vdW-type topological materials and magnets offers a promising route to energy-efficient magnetization control in SOT-based spintronics.
Collapse
Affiliation(s)
- Inseob Shin
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
| | - Won Joon Cho
- Material Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16678, Republic of Korea
| | - Eun-Su An
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, 37673, Republic of Korea
| | - Sungyu Park
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, 37673, Republic of Korea
| | - Hyeon-Woo Jeong
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
| | - Seong Jang
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
| | - Woon Joong Baek
- Material Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16678, Republic of Korea
| | - Seong Yong Park
- Material Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16678, Republic of Korea
| | - Dong-Hwan Yang
- Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Pohang, 37673, Republic of Korea
| | - Jun Ho Seo
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
| | - Gi-Yeop Kim
- Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Pohang, 37673, Republic of Korea
| | - Mazhar N Ali
- Max Plank Institute for Microstructure Physics, Weinberg 2, 06120, Halle (Saale), Germany
| | - Si-Young Choi
- Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Pohang, 37673, Republic of Korea
| | - Hyun-Woo Lee
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
- Asia Pacific Center for Theoretical Physics, 77 Cheongam-Ro, Pohang, 37673, Republic of Korea
| | - Jun Sung Kim
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, 37673, Republic of Korea
| | - Sung Dug Kim
- Material Research Center, Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16678, Republic of Korea
| | - Gil-Ho Lee
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
- Asia Pacific Center for Theoretical Physics, 77 Cheongam-Ro, Pohang, 37673, Republic of Korea
| |
Collapse
|
6
|
Choi YB, Xie Y, Chen CZ, Park J, Song SB, Yoon J, Kim BJ, Taniguchi T, Watanabe K, Kim J, Fong KC, Ali MN, Law KT, Lee GH. Author Correction: Evidence of higher-order topology in multilayer WTe 2 from Josephson coupling through anisotropic hinge states. Nat Mater 2020; 19:1036. [PMID: 32681037 DOI: 10.1038/s41563-020-0762-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Collapse
Affiliation(s)
- Yong-Bin Choi
- Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Yingming Xie
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Chui-Zhen Chen
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
- Institute for Advanced Study and School of Physical Science and Technology, Soochow University, Suzhou, China
| | - Jinho Park
- Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Su-Beom Song
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Jiho Yoon
- Max Plank Institute for Microstructure Physics, Halle (Saale), Germany
| | - B J Kim
- Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, Republic of Korea
| | - Takashi Taniguchi
- Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
| | - Kenji Watanabe
- Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
| | - Jonghwan Kim
- Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Kin Chung Fong
- Raytheon BBN Technologies, Quantum Information Processing Group, Cambridge, MA, USA.
| | - Mazhar N Ali
- Max Plank Institute for Microstructure Physics, Halle (Saale), Germany.
| | - Kam Tuen Law
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
| | - Gil-Ho Lee
- Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea.
- Asia Pacific Center for Theoretical Physics, Pohang, Republic of Korea.
| |
Collapse
|
7
|
Choi YB, Xie Y, Chen CZ, Park J, Song SB, Yoon J, Kim BJ, Taniguchi T, Watanabe K, Kim J, Fong KC, Ali MN, Law KT, Lee GH. Evidence of higher-order topology in multilayer WTe 2 from Josephson coupling through anisotropic hinge states. Nat Mater 2020; 19:974-979. [PMID: 32632280 DOI: 10.1038/s41563-020-0721-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 06/01/2020] [Indexed: 06/11/2023]
Abstract
Td-WTe2 (non-centrosymmetric and orthorhombic), a type-II Weyl semimetal, is expected to have higher-order topological phases with topologically protected, helical one-dimensional hinge states when its Weyl points are annihilated. However, the detection of these hinge states is difficult due to the semimetallic behaviour of the bulk. In this study, we have spatially resolved the hinge states by analysing the magnetic field interference of the supercurrent in Nb-WTe2-Nb proximity Josephson junctions. The Josephson current along the a axis of the WTe2 crystal, but not along the b axis, showed a sharp enhancement at the edges of the junction, and the amount of enhanced Josephson current was comparable to the upper limits of a single one-dimensional helical channel. Our experimental observations suggest a higher-order topological phase in WTe2 and its corresponding anisotropic topological hinge states, in agreement with theoretical calculations. Our work paves the way for the study of hinge states in topological transition-metal dichalcogenides and analogous phases.
Collapse
Affiliation(s)
- Yong-Bin Choi
- Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Yingming Xie
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Chui-Zhen Chen
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
- Institute for Advanced Study and School of Physical Science and Technology, Soochow University, Suzhou, China
| | - Jinho Park
- Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Su-Beom Song
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Jiho Yoon
- Max Plank Institute for Microstructure Physics, Halle (Saale), Germany
| | - B J Kim
- Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, Republic of Korea
| | - Takashi Taniguchi
- Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
| | - Kenji Watanabe
- Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
| | - Jonghwan Kim
- Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Kin Chung Fong
- Raytheon BBN Technologies, Quantum Information Processing Group, Cambridge, MA, USA.
| | - Mazhar N Ali
- Max Plank Institute for Microstructure Physics, Halle (Saale), Germany.
| | - Kam Tuen Law
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
| | - Gil-Ho Lee
- Department of Physics, Pohang University of Science and Technology, Pohang, Republic of Korea.
- Asia Pacific Center for Theoretical Physics, Pohang, Republic of Korea.
| |
Collapse
|
8
|
Yoon J, Lesne E, Sklarek K, Sheckelton J, Pasco C, Parkin SSP, McQueen TM, Ali MN. Anomalous thickness-dependent electrical conductivity in van der Waals layered transition metal halide, Nb 3Cl 8. J Phys Condens Matter 2020; 32:304004. [PMID: 32213671 DOI: 10.1088/1361-648x/ab832b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Understanding the electronic transport properties of layered, van der Waals transition metal halides (TMHs) and chalcogenides is a highly active research topic today. Of particular interest is the evolution of those properties with changing thickness as the 2D limit is approached. Here, we present the electrical conductivity of exfoliated single crystals of the TMH, cluster magnet, Nb3Cl8, over a wide range of thicknesses both with and without hexagonal boron nitride (hBN) encapsulation. The conductivity is found to increase by more than three orders of magnitude when the thickness is decreased from 280 µm to 5 nm, at 300 K. At low temperatures and below ∼50 nm, the conductance becomes thickness independent, implying surface conduction is dominating. Temperature dependent conductivity measurements indicate Nb3Cl8 is an insulator, however, the effective activation energy decreases from a bulk value of 310 meV to 140 meV by 5 nm. X-ray photoelectron spectroscopy (XPS) shows mild surface oxidation in devices without hBN capping, however, no significant difference in transport is observed when compared to the capped devices, implying the thickness dependent transport behavior is intrinsic to the material. A conduction mechanism comprised of a higher conductivity surface channel in parallel with a lower conductivity interlayer channel is discussed.
Collapse
Affiliation(s)
- Jiho Yoon
- Max Planck Institute of Microstructure Physics, Weinberg 2, Halle 06120, Germany
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Yang SY, Wang Y, Ortiz BR, Liu D, Gayles J, Derunova E, Gonzalez-Hernandez R, Šmejkal L, Chen Y, Parkin SSP, Wilson SD, Toberer ES, McQueen T, Ali MN. Giant, unconventional anomalous Hall effect in the metallic frustrated magnet candidate, KV 3Sb 5. Sci Adv 2020; 6:eabb6003. [PMID: 32789181 PMCID: PMC7399694 DOI: 10.1126/sciadv.abb6003] [Citation(s) in RCA: 76] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 06/16/2020] [Indexed: 05/26/2023]
Abstract
The anomalous Hall effect (AHE) is one of the most fundamental phenomena in physics. In the highly conductive regime, ferromagnetic metals have been the focus of past research. Here, we report a giant extrinsic AHE in KV3Sb5, an exfoliable, highly conductive semimetal with Dirac quasiparticles and a vanadium Kagome net. Even without report of long range magnetic order, the anomalous Hall conductivity reaches 15,507 Ω-1 cm-1 with an anomalous Hall ratio of ≈ 1.8%; an order of magnitude larger than Fe. Defying theoretical expectations, KV3Sb5 shows enhanced skew scattering that scales quadratically, not linearly, with the longitudinal conductivity, possibly arising from the combination of highly conductive Dirac quasiparticles with a frustrated magnetic sublattice. This allows the possibility of reaching an anomalous Hall angle of 90° in metals. This observation raises fundamental questions about AHEs and opens new frontiers for AHE and spin Hall effect exploration, particularly in metallic frustrated magnets.
Collapse
Affiliation(s)
- Shuo-Ying Yang
- Max Planck Institute of Microstructure Physics, Halle, Germany
| | - Yaojia Wang
- Max Planck Institute of Microstructure Physics, Halle, Germany
| | - Brenden R. Ortiz
- University of California at Santa Barbara, Santa Barbara, California 93106, USA
| | - Defa Liu
- Max Planck Institute of Microstructure Physics, Halle, Germany
| | - Jacob Gayles
- Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
- Department of Physics, University of South Florida, Tampa, Florida 33620, USA
| | - Elena Derunova
- Max Planck Institute of Microstructure Physics, Halle, Germany
| | | | - Libor Šmejkal
- Johannes Gutenberg University of Mainz, Mainz, Germany
- Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 162 00 Praha 6, Czech Republic
- Charles University, Prague, Czech Republic
| | - Yulin Chen
- Oxford Department of Physics, Oxford, England
| | | | - Stephen D. Wilson
- University of California at Santa Barbara, Santa Barbara, California 93106, USA
| | | | - Tyrel McQueen
- Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Mazhar N. Ali
- Max Planck Institute of Microstructure Physics, Halle, Germany
| |
Collapse
|
10
|
Marsh DJE, Fong KC, Lentz EW, Šmejkal L, Ali MN. Proposal to Detect Dark Matter using Axionic Topological Antiferromagnets. Phys Rev Lett 2019; 123:121601. [PMID: 31633991 DOI: 10.1103/physrevlett.123.121601] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Indexed: 06/10/2023]
Abstract
Antiferromagnetically doped topological insulators (ATI) are among the candidates to host dynamical axion fields and axion polaritons, weakly interacting quasiparticles that are analogous to the dark axion, a long sought after candidate dark matter particle. Here we demonstrate that using the axion quasiparticle antiferromagnetic resonance in ATIs in conjunction with low-noise methods of detecting THz photons presents a viable route to detect axion dark matter with a mass of 0.7 to 3.5 meV, a range currently inaccessible to other dark matter detection experiments and proposals. The benefits of this method at high frequency are the tunability of the resonance with applied magnetic field, and the use of ATI samples with volumes much larger than 1 mm^{3}.
Collapse
Affiliation(s)
- David J E Marsh
- Institut für Astrophysik, Georg-August Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
| | - Kin Chung Fong
- Raytheon BBN Technologies, Quantum Engineering and Computing, Cambridge, Massachusetts 02138, USA
| | - Erik W Lentz
- Institut für Astrophysik, Georg-August Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
| | - Libor Šmejkal
- Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany
- Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 53 Praha 6 Czech Republic
- Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague 2, Czech Republic
| | - Mazhar N Ali
- Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle (Saale), Germany
| |
Collapse
|
11
|
Di Sante D, Das PK, Bigi C, Ergönenc Z, Gürtler N, Krieger JA, Schmitt T, Ali MN, Rossi G, Thomale R, Franchini C, Picozzi S, Fujii J, Strocov VN, Sangiovanni G, Vobornik I, Cava RJ, Panaccione G. Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe_{2}. Phys Rev Lett 2017; 119:026403. [PMID: 28753342 DOI: 10.1103/physrevlett.119.026403] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Indexed: 06/07/2023]
Abstract
By combining bulk sensitive soft-x-ray angular-resolved photoemission spectroscopy and first-principles calculations we explored the bulk electron states of WTe_{2}, a candidate type-II Weyl semimetal featuring a large nonsaturating magnetoresistance. Despite the layered geometry suggesting a two-dimensional electronic structure, we directly observe a three-dimensional electronic dispersion. We report a band dispersion in the reciprocal direction perpendicular to the layers, implying that electrons can also travel coherently when crossing from one layer to the other. The measured Fermi surface is characterized by two well-separated electron and hole pockets at either side of the Γ point, differently from previous more surface sensitive angle-resolved photoemission spectroscopy experiments that additionally found a pronounced quasiparticle weight at the zone center. Moreover, we observe a significant sensitivity of the bulk electronic structure of WTe_{2} around the Fermi level to electronic correlations and renormalizations due to self-energy effects, previously neglected in first-principles descriptions.
Collapse
Affiliation(s)
- Domenico Di Sante
- Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland Campus Süd, Würzburg 97074, Germany
| | - Pranab Kumar Das
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy
- International Centre for Theoretical Physics (ICTP), Strada Costiera 11, I-34100 Trieste, Italy
| | - C Bigi
- Dipartimento di Fisica, Universitá di Milano, Via Celoria 16, I-20133 Milano, Italy
| | - Z Ergönenc
- Computational Materials Physics, University of Vienna, Sensengasse 8/8, A-1090 Vienna, Austria
| | - N Gürtler
- Computational Materials Physics, University of Vienna, Sensengasse 8/8, A-1090 Vienna, Austria
| | - J A Krieger
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
- Laboratorium für Festkörperphysik, ETH-Hönggerberg, CH-8093 Zürich, Switzerland
| | - T Schmitt
- Paul Scherrer Institute, Swiss Light Source, CH-5232 Villigen, Switzerland
| | - M N Ali
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - G Rossi
- Dipartimento di Fisica, Universitá di Milano, Via Celoria 16, I-20133 Milano, Italy
| | - R Thomale
- Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland Campus Süd, Würzburg 97074, Germany
| | - C Franchini
- Computational Materials Physics, University of Vienna, Sensengasse 8/8, A-1090 Vienna, Austria
| | - S Picozzi
- Consiglio Nazionale delle Ricerche (CNR-SPIN), Via Vetoio, L'Aquila 67100, Italy
| | - J Fujii
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy
| | - V N Strocov
- Paul Scherrer Institute, Swiss Light Source, CH-5232 Villigen, Switzerland
| | - G Sangiovanni
- Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland Campus Süd, Würzburg 97074, Germany
| | - I Vobornik
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy
| | - R J Cava
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - G Panaccione
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy
| |
Collapse
|
12
|
Ali MN, Schoop LM, Garg C, Lippmann JM, Lara E, Lotsch B, Parkin SSP. Butterfly magnetoresistance, quasi-2D Dirac Fermi surface and topological phase transition in ZrSiS. Sci Adv 2016; 2:e1601742. [PMID: 28028541 PMCID: PMC5161428 DOI: 10.1126/sciadv.1601742] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 11/15/2016] [Indexed: 05/14/2023]
Abstract
Magnetoresistance (MR), the change of a material's electrical resistance in response to an applied magnetic field, is a technologically important property that has been the topic of intense study for more than a quarter century. We report the observation of an unusual "butterfly"-shaped titanic angular magnetoresistance (AMR) in the nonmagnetic Dirac material, ZrSiS, which we find to be the most conducting sulfide known, with a 2-K resistivity as low as 48(4) nΩ⋅cm. The MR in ZrSiS is large and positive, reaching nearly 1.8 × 105 percent at 9 T and 2 K at a 45° angle between the applied current (I || a) and the applied field (90° is H || c). Approaching 90°, a "dip" is seen in the AMR, which, by analyzing Shubnikov de Haas oscillations at different angles, we find to coincide with a very sharp topological phase transition unlike any seen in other known Dirac/Weyl materials. We find that ZrSiS has a combination of two-dimensional (2D) and 3D Dirac pockets comprising its Fermi surface and that the combination of high-mobility carriers and multiple pockets in ZrSiS allows for large property changes to occur as a function of angle between applied fields. This makes it a promising platform to study the physics stemming from the coexistence of 2D and 3D Dirac electrons as well as opens the door to creating devices focused on switching between different parts of the Fermi surface and different topological states.
Collapse
Affiliation(s)
- Mazhar N. Ali
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA
- Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany
- Corresponding author.
| | - Leslie M. Schoop
- Max Planck Institute for Solid State Research, Heisenbergstasse 1, 70569 Stuttgart, Germany
| | - Chirag Garg
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA
- Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany
| | - Judith M. Lippmann
- Max Planck Institute for Solid State Research, Heisenbergstasse 1, 70569 Stuttgart, Germany
| | - Erik Lara
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA
| | - Bettina Lotsch
- Max Planck Institute for Solid State Research, Heisenbergstasse 1, 70569 Stuttgart, Germany
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Stuart S. P. Parkin
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA
- Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany
| |
Collapse
|
13
|
Schoop LM, Ali MN, Straßer C, Topp A, Varykhalov A, Marchenko D, Duppel V, Parkin SSP, Lotsch BV, Ast CR. Dirac cone protected by non-symmorphic symmetry and three-dimensional Dirac line node in ZrSiS. Nat Commun 2016; 7:11696. [PMID: 27241624 PMCID: PMC4895020 DOI: 10.1038/ncomms11696] [Citation(s) in RCA: 155] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 04/20/2016] [Indexed: 11/18/2022] Open
Abstract
Materials harbouring exotic quasiparticles, such as massless Dirac and Weyl fermions, have garnered much attention from physics and material science communities due to their exceptional physical properties such as ultra-high mobility and extremely large magnetoresistances. Here, we show that the highly stable, non-toxic and earth-abundant material, ZrSiS, has an electronic band structure that hosts several Dirac cones that form a Fermi surface with a diamond-shaped line of Dirac nodes. We also show that the square Si lattice in ZrSiS is an excellent template for realizing new types of two-dimensional Dirac cones recently predicted by Young and Kane. Finally, we find that the energy range of the linearly dispersed bands is as high as 2 eV above and below the Fermi level; much larger than of other known Dirac materials. This makes ZrSiS a very promising candidate to study Dirac electrons, as well as the properties of lines of Dirac nodes.
Collapse
Affiliation(s)
- Leslie M. Schoop
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| | - Mazhar N. Ali
- Max Plank Institute for Microstructure Physics, Weinberg 2, 06120 Halle, Germany
- IBM-Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
| | - Carola Straßer
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| | - Andreas Topp
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| | - Andrei Varykhalov
- Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Dmitry Marchenko
- Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Viola Duppel
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| | - Stuart S. P. Parkin
- Max Plank Institute for Microstructure Physics, Weinberg 2, 06120 Halle, Germany
- IBM-Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
| | - Bettina V. Lotsch
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 München, Germany
- Nanosystems Initiative Munich (NIM) & Center for Nanoscience, Schellingstr. 4, 80799 München, Germany
| | - Christian R. Ast
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| |
Collapse
|
14
|
Qi Y, Naumov PG, Ali MN, Rajamathi CR, Schnelle W, Barkalov O, Hanfland M, Wu SC, Shekhar C, Sun Y, Süß V, Schmidt M, Schwarz U, Pippel E, Werner P, Hillebrand R, Förster T, Kampert E, Parkin S, Cava RJ, Felser C, Yan B, Medvedev SA. Superconductivity in Weyl semimetal candidate MoTe2. Nat Commun 2016; 7:11038. [PMID: 26972450 PMCID: PMC4793082 DOI: 10.1038/ncomms11038] [Citation(s) in RCA: 213] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 02/15/2016] [Indexed: 12/25/2022] Open
Abstract
Transition metal dichalcogenides have attracted research interest over the last few decades due to their interesting structural chemistry, unusual electronic properties, rich intercalation chemistry and wide spectrum of potential applications. Despite the fact that the majority of related research focuses on semiconducting transition-metal dichalcogenides (for example, MoS2), recently discovered unexpected properties of WTe2 are provoking strong interest in semimetallic transition metal dichalcogenides featuring large magnetoresistance, pressure-driven superconductivity and Weyl semimetal states. We investigate the sister compound of WTe2, MoTe2, predicted to be a Weyl semimetal and a quantum spin Hall insulator in bulk and monolayer form, respectively. We find that bulk MoTe2 exhibits superconductivity with a transition temperature of 0.10 K. Application of external pressure dramatically enhances the transition temperature up to maximum value of 8.2 K at 11.7 GPa. The observed dome-shaped superconductivity phase diagram provides insights into the interplay between superconductivity and topological physics.
Collapse
Affiliation(s)
- Yanpeng Qi
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Pavel G. Naumov
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Mazhar N. Ali
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - Catherine R. Rajamathi
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Walter Schnelle
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Oleg Barkalov
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Michael Hanfland
- European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France
| | - Shu-Chun Wu
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Chandra Shekhar
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Yan Sun
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Vicky Süß
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Marcus Schmidt
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Ulrich Schwarz
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Eckhard Pippel
- Max Planck Institute of Microstructure Physics, 06120 Halle, Germany
| | - Peter Werner
- Max Planck Institute of Microstructure Physics, 06120 Halle, Germany
| | | | - Tobias Förster
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Erik Kampert
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Stuart Parkin
- Max Planck Institute of Microstructure Physics, 06120 Halle, Germany
| | - R. J. Cava
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - Claudia Felser
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Binghai Yan
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
- Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany
| | - Sergey A. Medvedev
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| |
Collapse
|
15
|
Colunga Blanco S, Gonzalez Matos C, Angelis A, Dinis PG, Chinali M, Toth A, Andreassi MG, Rodriguez Munoz D, Reid AB, Park JH, Shetye A, Novo G, De Marchi SF, Cikes M, Smarz K, Illatopa V, Peluso D, Wellnhofer E, De La Rosa Riestra A, Sattarzadeh Badkoubeh R, Mandour Ali M, Azoz A, Pontone G, Krljanac G, Acar R, Nucifora G, Sirtautas A, Roos ST, Qasem MS, Marini C, Fabiani I, Gillis K, Bandera F, Borowiec A, Lim YJ, Chalbia TE, Santos M, Gao SA, Zilberszac R, Farrag AAM, Palmiero G, Aruta P, De Diego Soler O, Fasano D, Tamborini G, Ancona F, Raafat DM, Marchel M, De Gregorio C, Gommans DHF, Godinho AR, Mielczarek M, Bandera F, Kubik M, Cho JY, Tarando F, Lourenco Marmelo BF, Reis L, Domingues K, Krestjyaninov MV, Mesquita J, Ikonomidis I, Ferferieva V, Peluso D, Peluso D, King GJ, D'ascenzi F, Ferrera Duran C, Sormani P, Gonzalez Fernandez O, Tereshina O, Cambronero Cortinas E, Kupczynska K, Carvalho JF, Shivalkar B, Aghamohammadzadeh R, Cifra B, Cifra B, Bandera F, Kuznetsov VA, Van Zalen JJ, Kochanowski J, Goebel B, Ladeiras-Lopes R, Goebel B, Karvandi M, Karvandi M, Alonso Salinas G, Unkun T, Ranjbar S, Hubert A, Enescu OA, Liccardo M, Cameli M, Ako E, Lembo M, Goffredo C, Enache R, Novo G, Wdowiak-Okrojek K, Nemes A, Nemes A, Di Salvo G, Capotosto L, Caravaca P, Maceira Gonzalez AM, Iriart X, Jug B, Garcia Campos A, Capin Sampedro E, Corros Vicente C, Martin Fernandez M, Leon Arguero V, Fidalgo Arguelles A, Velasco Alonso E, Lopez Iglesias F, De La Hera Galarza JM, Chaparro-Munoz M, Recio-Mayoral A, Vlachopoulos C, Ioakeimidis N, Felekos I, Abdelrasoul M, Aznaouridis K, Chrysohoou C, Rousakis G, Aggeli K, Tousoulis D, Faustino AC, Paiva L, Fernandes A, Costa M, Cachulo MC, Goncalves L, Emma F, Rinelli G, Esposito C, Franceschini A, Doyon A, Raimondi F, Schaefer F, Pongiglione G, Mateucci MC, Vago H, Juhasz C, Janosa C, Oprea V, Balint OH, Temesvari A, Simor T, Kadar K, Merkely B, Bruno RM, Borghini A, Stea F, Gargani L, Mercuri A, Sicari R, Picano E, Lozano Granero C, Carbonell San Roman A, Moya Mur JL, Fernandez-Golfin C, Moreno Planas J, Fernandez Santos S, Casas Rojo E, Hernandez-Madrid A, Zamorano Gomez JL, Pearce K, Gamlin W, Miller C, Schmitt M, Seong IW, Kim KH, Kim MJ, Jung HO, Sohn IS, Park SM, Cho GY, Choi JO, Park SW, Nazir SA, Khan JN, Singh A, Kanagala P, Squire I, Mccann GP, Di Lisi D, Meschisi MC, Brunco V, Badalamenti G, Bronte E, Russo A, Novo S, Von Tscharner M, Urheim S, Aakhus S, Seiler C, Schmalholz S, Biering-Sorensen T, Cheng S, Oparil S, Izzo J, Pitt B, Solomon SD, Zaborska B, Jaxa-Chamiec T, Tysarowski M, Budaj A, Cordova F, Aguirre O, Sanabria S, Ortega J, Romeo G, Perazzolo Marra M, Tona F, Famoso G, Pigatto E, Cozzi F, Iliceto S, Badano LP, Kriatselis C, Gerds-Li JH, Kropf M, Pieske B, Graefe M, Martinez Santos P, Batlle Lopez E, Vilacosta I, Sanchez Sauce B, Espana Barrio E, Jimenez Valtierra J, Campuzano Ruiz R, Alonso Bello J, Martin Rios MD, Farrashi M, Abtahi H, Sadeghi H, Sadeghipour P, Tavoosi A, Abdel Rahman TA, Mohamed LA, Maghraby HM, Kora IM, Abdel Hameed FR, Ali MN, Al Shehri A, Youssef A, Gad A, Alsharqi M, Alsaikhan L, Andreini D, Rota C, Guglielmo M, Mushtaq S, Baggiano A, Beltrama V, Solbiati A, Guaricci AI, Pepi M, Trifunovic D, Sobic Saranovic D, Savic L, Grozdic Milojevic I, Asanin M, Srdic M, Petrovic M, Zlaic N, Mrdovic I, Dogan C, Izci S, Gecmen C, Unkun T, Cap M, Erdogan E, Onal C, Yilmaz F, Ozdemir N, Muser D, Tioni C, Zanuttini D, Morocutti G, Spedicato L, Bernardi G, Proclemer A, Pranevicius R, Zapustas N, Briedis K, Valuckiene Z, Jurkevicius R, Juffermans LJM, Enait V, Van Royen N, Van Rossum AC, Kamp O, Khalaf HASSEN, Hitham SAKER, Osama AS, Abazid RAMI, Guall RAHIM, Durdan SHAFAT, Mohammed ZYAD, Stella S, Rosa I, Ancona F, Spartera M, Italia L, Latib A, Colombo A, Margonato A, Agricola E, Scatena C, Mazzanti C, Conte L, Pugliese N, Barletta V, Bortolotti U, Naccarato AG, Di Bello V, Bala G, Roosens B, Hernot S, Remory I, Droogmans S, Cosyns B, Generati G, Labate V, Donghi V, Pellegrino M, Carbone F, Alfonzetti E, Guazzi M, Dabrowski R, Kowalik I, Firek B, Chwyczko T, Szwed H, Kawamura A, Kawano S, Zaroui A, Ben Said R, Ben Halima M, Kheder N, Farhati A, Mourali S, Mechmech R, Leite L, Martins R, Baptista R, Barbosa A, Ribeiro N, Oliveira A, Castro G, Pego M, Polte CL, Lagerstrand K, Johnsson ÅA, Janulewicz M, Bech-Hanssen O, Gabriel H, Wisser W, Maurer G, Rosenhek R, El Aroussy W, Abdel Ghany M, Al Adeeb K, Ascione L, Carlomagno G, Sordelli C, Ferro A, Ascione R, Severino S, Caso P, Muraru D, Janei C, Haertel Miglioranza M, Cavalli G, Romeo G, Peluso D, Cucchini U, Iliceto S, Badano L, Armario Bel X, Garcia-Garcia C, Ferrer Sistach E, Rueda Sobella F, Oliveras Vila T, Labata Salvador C, Serra Flores J, Lopez-Ayerbe J, Bayes-Genis A, Conte E, Gonella A, Morena L, Civelli D, Losardo L, Margaria F, Riva L, Tanga M, Carminati C, Muratori M, Gripari P, Ghulam Ali S, Fusini L, Vignati C, Bartorelli AL, Alamanni F, Pepi M, Rosa I, Stella S, Marini C, Spartera M, Latib A, Montorfano M, Colombo A, Margonato A, Agricola E, Ismaiel A, Ali N, Amry S, Serafin A, Kochanowski J, Filipiak KJ, Opolski G, Speranza G, Ando' G, Magaudda L, Cramer GE, Bakker J, Michels M, Dieker HJ, Fouraux MA, Marcelis CLM, Timmermans J, Brouwer MA, Kofflard MJM, Vasconcelos M, Araujo V, Almeida P, Sousa C, Macedo F, Cardoso JS, Maciel MJ, Voilliot D, Huttin O, Venner C, Olivier A, Villemin T, Deballon R, Manenti V, Juilliere Y, Selton-Suty C, Generati G, Pellegrino M, Labate V, Carbone F, Alfonzetti E, Guazzi M, Dabrowska-Kugacka A, Dorniak K, Lewicka E, Szalewska D, Kutniewska-Kubik M, Raczak G, Kim KH, Yoon HJ, Park HJ, Ahn Y, Jeong MH, Cho JG, Park JC, Kim JH, Galli E, Habib G, Schnell F, Lederlin M, Daubert JC, Mabo P, Donal E, Faria R, Magalhaes P, Marques N, Domingues K, Lourenco C, Almeida AR, Teles L, Picarra B, Azevedo O, Lourenco C, Oliveira M, Magalhaes P, Domingues K, Marmelo B, Almeida A, Picarra B, Faria R, Marques N, Bento D, Lourenco C, Magalhaes P, Cruz I, Marmelo B, Reis L, Picarra B, Faria R, Azevedo O, Gimaev RH, Melnikova MA, Olezov NV, Ruzov VI, Goncalves P, Almeida MS, Branco P, Carvalho MS, Dores H, Gaspar MA, Sousa H, Andrade MJ, Mendes M, Makavos G, Varoudi M, Papadavid E, Andreadou I, Gravanis K, Liarakos N, Pavlidis G, Rigopoulos D, Lekakis J, Deluyker D, Bito V, Pigatto E, Romeo G, Muraru D, Cozzi F, Punzi L, Iliceto S, Badano LP, Pigatto E, Romeo G, Muraru D, Cozzi F, Iliceto S, Badano LP, Neilan T, Coen K, Gannon S, Bennet K, Clarke JG, Solari M, Cameli M, Focardi M, Corrado D, Bonifazi M, Henein M, Mondillo S, Gomez-Escalonilla C, De Agustin A, Egido J, Islas F, Simal P, Gomez De Diego JJ, Luaces M, Macaya C, Perez De Isla L, Zancanella M, Rusconi C, Musca F, Santambrogio G, De Chiara B, Vallerio P, Cairoli R, Giannattasio G, Moreo A, Alvarez Ortega C, Mori Junco R, Caro Codon J, Meras Colunga P, Ponz De Antonio I, Lopez Fernandez T, Valbuena Lopez S, Moreno Yanguela M, Lopez-Sendon JL, Surkova E, Bonanad-Lozano C, Lopez-Lereu MP, Monmeneu-Menadas JV, Gavara J, De Dios E, Paya-Chaume A, Escribano-Alarcon D, Chorro-Gasco FJ, Bodi-Peris V, Michalski BW, Miskowiec D, Kasprzak JD, Lipiec P, Morgado G, Caldeira D, Cruz I, Joao I, Almeida AR, Lopes L, Fazendas P, Cotrim C, Pereira H, De Block C, Buys D, Salgado R, Vrints C, Van Gaal L, Mctear C, Irwin RB, Dragulescu A, Friedberg M, Mertens L, Dragulescu A, Friedberg M, Mertens L, Carbone F, Generati G, Pellegrino M, Labate V, Alfonzetti E, Guazzi M, Krinochkin DV, Yaroslavskaya EI, Zaharova EH, Pushkarev GS, Sugihara C, Patel NR, Sulke AN, Lloyd GW, Piatkowski R, Scislo P, Grabowski M, Marchel M, Opolski G, Roland H, Hamadanchi A, Otto S, Jung C, Lauten A, Figulla HC, Poerner TC, Sampaio F, Fonseca P, Fontes-Carvalho R, Pinho M, Campos AS, Castro P, Fonseca C, Ribeiro J, Gama V, Heck R, Hamdanchi A, Otto S, Jung C, Lauten A, Figulla HR, Poerner TC, Ranjbar S, Ghaffaripour Jahromi M, Ranjbar S, Hinojar R, Fernandez Golfin C, Esteban A, Pascual-Izco M, Garcia-Martin A, Casas Rojo E, Jimenez-Nacher JJ, Zamorano JL, Gecmen C, Cap M, Izci S, Erdogan E, Onal C, Acar R, Bakal RB, Kaymaz C, Ozdemir N, Karvandi M, Ghaffaripour Jahromi M, Galand V, Schnell F, Matelot D, Martins R, Leclercq C, Carre F, Suran BC, Margulescu AD, Rimbas RC, Siliste C, Vinereanu D, Nocerino P, Urso AC, Borrino A, Carbone C, Follero P, Ciardiello C, Prato L, Salzano G, Marino F, Ruspetti A, Sparla S, Di Tommaso C, Loiacono F, Focardi M, D'ascenzi F, Henein M, Mondillo S, Porter J, Walker M, Lo Iudice F, Esposito R, Santoro C, Cocozza S, Izzo R, De Luca N, De Simone G, Trimarco B, Galderisi M, Gervasi F, Patti G, Mega S, Bono M, Di Sciascio G, Buture A, Badea R, Platon P, Ghiorghiu I, Jurcut R, Coman IM, Popescu BA, Ginghina C, Lunetta M, Spoto MS, Lo Vi AM, Pensabene G, Meschisi MC, Carita P, Coppola G, Novo S, Assennato P, Shim A, Wejner-Mik P, Kasprzak JD, Lipiec P, Havasi K, Domsik P, Kalapos A, Forster T, Piros GA, Domsik P, Kalapos A, Lengyel C, Orosz A, Forster T, Bulbul Z, Issa Z, Al Sehly A, Pergola V, Oufi S, Conde Y, Cimino E, Rinaldi E, Ashurov R, Ricci S, Pergolini M, Vitarelli A, Lujan Valencia JE, Chaparro M, Garcia-Guerrero A, Cristo Ropero MJ, Izquierdo Bajo A, Madrona L, Recio-Mayoral A, Monmeneu JV, Igual B, Lopez Lereu P, Garcia MP, Selmi W, Jalal Z, Thambo JB, Kosuta D, Fras Z. Poster session 5The imaging examinationP1097Correlation between visual and quantitative assessment of left ventricle: intra- and inter-observer agreementP1099Incremental prognostic value of late gadolinium-enhanced by cardiac magnetic resonance in patients with heart failureAnatomy and physiology of the heart and great vesselsP1100Left ventricular geometry and diastolic performance in erectile dysfunction patients; a topic of differential arterial stiffness influenceAssessment of diameters, volumes and massP1101Impact of the percutaneous closure of atrial septal defect on the right heart "remodeling"P1102Left Ventricular Mass Indexation in Infants, Children and Adolescents: a Simplified Approach for the Identification of Left Ventricular Hypertrophy in Clinical PracticeP1103Impact of trabecules while quantifying cardiac magnetic resonance exams in patients with systemic right ventricleP1104Detection of subclinical atherosclerosis by carotid intima-media thickness: correlation with leukocytes telomere shorteningAssessments of haemodynamicsP1105Flow redirection towards the left ventricular outflow tract: vortex formation is not affected by variations in atrio-ventricular delayAssessment of systolic functionP1106Reproducibility and feasibility of cardiac MRI feature tracking in Fabry diseaseP1107Normal left ventricular strain values by two-dimensional strain echocardiography; result of normal (normal echocardiographic dimensions and functions in korean people) studyP1108Test-retest repeatability of global strain following st-elevation myocardial infarction - a comparison of tagging and feature trackingP1109Cardiotoxicity induced by tyrosine kinase inhibitors in patients with gastrointestinal stromal tumors (GIST)P1110Finite strain ellipses for the analysis of left ventricular principal strain directions using 3d speckle tracking echocardiographyP1111Antihypertensive therapy reduces time to peak longitudinal strainP1112Right ventricular systolic function as a marker of prognosis after inferior myocardial infarction - 5-year follow-upP1113Is artery pulmonary dilatation related with right but also early left ventricle dysfunction in pulmonary artery hypertension?P1114Right ventricular mechanics changes according to pressure overload increasing, a 2D-speckle tracking echocardiographic evaluationAssessment of diastolic functionP1115Paired comparison of left atrial strain from P-wave to P-wave and R-wave to R-waveP1116Diagnostic role of Tissue Doppler Imaging echocardiographic criteria in obese heart failure with preserved ejection fraction patientsP1117Evaluation of diastolic function of right ventricle in idiopathic pulmonary arterial hypertensionP1118Severity and predictors of diastolic dysfunction in a non-hypertensive non-ischemic cohort of Egyptian patients with documented systemic autoimmune disease; pilot reportP1119correlation between ST segment shift and cardiac diastolic function in patients with acute myocardial infarctionIschemic heart diseaseP1120Computed tomography coronary angiography verSus sTRess cArdiac magneTic rEsonance for the manaGement of sYmptomatic revascularized patients: a cost effectiveness study (STRATEGY study)P1121Utility of transmural myocardial mechanic for early infarct size prediction after primary percutaneous coronary intervention in STEMI patientsP1122Progressive Improvements of the echocardiographic deformation parameters in ST Elevation Myocardial Infarction after five years follow-upP1123Long-term prognostic value of left ventricular dyssynchrony as assessed by cardiac magnetic resonance feature-tracking imaging after a first st-segment elevation myocardial infarctionP1124Differences in mitral annulus remodeling in acute anterior ST elevation and acute inferior ST elevation myocardial infarctionP1125Reduction of microvascular injury using a novel theragnostic ultrasound strategy: a first in men feasibility and safety studyP1126Impact of focused echocardiography in clinical decision of patient presented with st elevation myocardial infarction underwent primary angioplastyHeart valve DiseasesP1127Aortic valve area calculation in aortic stenosis: a comparison among conventional and 3D-transesophageal echocardiography and computed tomographyP1128Myocardial fibrosis and microRNA-21 expression in patients with severe aortic valve stenosis and preserved ejection fraction: a 2D speckle tracking echocardiography, tissutal and plasmatic studyP1129Quantification of calcium amount in a new experimental model: a comparison between calibrated integrated backscatter of ultrasound and computed tomographyP1130Altered diffusion capacity in aortic stenosis: role of the right heartP1131Osteoprotegerin predicts all-cause mortality in calcific aortic stenosis patients with preserved left ventricle ejection fraction in long term observationP1132Mitral regurgitation as a risk factor for pulmonary hypertension in patients with aortic stenosisP1133The relationship between the level of plasma B-type natriuretic peptide and mitral stenosisP1134Aortic regurgitation, left ventricle mechanics and vascular load: a single centre 2d derived-speckle tracking studyP1135Feasibility and reproducibility issues limit the usefulness of quantitative colour Doppler parameters in the assessment of chronic aortic and mitral regurgitation severityP1136Predictors of postoperative outcome in degenerative mitral regurgitationP1137Left ventricular mechanical dyssynchrony in patients with severe mitral regurgitation of rheumatic etiology; three dimensional echocardiography studyP1138Functional mitral regurgitation and left atrial dysfunction concur in determining pulmonary hypertension and functional status in subjects with left ventricular systolic dysfunctionP11393D echocardiography allows more effective quantitative assessment of the severity of functional tricuspid regurgitation than conventional 2D/Doppler echocardiographyP1140Prosthetic valve thrombosis: still a severe disease? 10-years experience in a university hospitalP1141Validity of echocardiography in the hospital course of patients with feverP1142Do baseline 3DTEE characteristics of mitral valve apparatus predict long term result in patients undergoing percutaneous valve repair for degenerative regurgitation?P1143Influence of baseline aortic regurgitation on mitral regurgitation change after transcatheter aortic valve replacement for aortic stenosisP1144Prevalence of echocardiography detected significant valvular regurge in subclinical rheumatic carditis in assiut childrenCardiomyopathiesP1145Can we early detect left ventricular systolic dysfunction in patients with Duchenne muscular dystrophy using global longitudinal strain assessment?P1146Prevalence of isolated papillary muscle hypertrophy in young competitive athletesP1147Troponin release after exercise in patients with hypertrophic cardiomyopathy: associations with clinical and mr imaging characteristicsP1148Atrial fibrillation in hypertrophic cardiomyopathy: can we score the risk?P1149Impact of hypertrophy on multiple layer longitudinal deformation in hypertrophy cardiomyopathy and cardiac amyloidosis compared to controlsP1150Functional evaluation in hypertrophic cardiomyopathy combining cardiopulmonary exercise testing combined with exercise-echocardiographyP1151Refinement of the old diagnostic criteria of left ventricular noncompaction cardiomyopathy (LVNC) based on cardiac magnetic resonance (CMR)P1152Differences of clinical characteristics and outcomes between acute myocarditis with preserved and reduced left ventricular systolic functionP1153Value of longitudinal strain for distinguishing left ventricular non-compaction from idiopathic dilated cardiomyopathyP1154Speed of recovery of left ventricular function is not related to the prognosis of Takotsubo cardiomyopathy. A Portuguese multicentre studyP1155Predictors of in-hospital left ventricular systolic function recovery after admission with takotsubo cardiomyopathy. Portuguese multicentre studyP1156Mid-ventricular takotsubo detected by initial echocardiogram associates with recurrence of takotsubo cardiomyopathy - a portuguese multicentre studySystemic diseases and other conditionsP1157Relations between left ventricle remodelling and expression of angiotensin 2 AT2R1 geneP1158Impact of renal denervation on long-term blood pressure variability and surrogate markers of target organ damage in individuals with drug-resistant arterial hypertensionP1159Greater improvement of coronary artery function, left ventricular deformation and twisting by IL12/23 compared to TNF-a inhibition in psoriasisP1160Advanced glycation end products play a role in adverse LV remodeling following MIP1161Incidence of subclinical myocardial dysfunction in patients with systemic sclerosis and normal left ventricular systolic and diastolic functionP1162Left atrial remodeling and dysfunction occur early in patients with systemic sclerosis and normal left ventricular functionP1163Intrinsic vortex formation : a unique performance indicatorP1164P-wave morphology is unaffected by training-induced biatrial dilatation: a prospective, longitudinal study in healthy athletesP1165Usefulness of transthoracic echocardiography in diagnosis of young patients with ischemic strokeP1166Primary cardiac lymphoma: role of echocardiography in the clinical managementP1167Abnormal echocardiographic findings in cancer patients before chemotherapyMasses, tumors and sources of embolismP1168Three-dimensional transesophageal echocardiography of the left atrial appendage reduces rate of postpone electrical cardioversionP1169Detection of ventricular thrombus by cmr after reperfused st-segment elevation myocardial infarction correlated with echocardiographyP1170Clinical and transthoracic echocardiographic predictors of left atrial appendage thrombus in patients with atrial fibrillationStress echocardiographyP1171Pharmacological stress echocardiography complications: a 4-year single center experienceP1172Myocardial functional and perfusion reserve in type I diabetesP1173Feasibility of incorporating 3D Dobutamine stress echocardiography into routine clinical practiceP1174Right ventricular isovolumic acceleration at rest and during exercise in children after heart transplantP1175Right ventricular systolic and diastolic response to exercise in children after heart transplant -a bicycle exercise studyP1176Determinants of functional capacity in heart failure patients with reduced ejection fractionP1177Handgrip stress echocardiography with emotional component compared to conventional isometric exercise in coronary artery disease diagnosisP1178The relationship between resting transthoracic echocardiography and exercise capacity in patients with paroxysmal atrial fibrillationP1179Correlation between NT-proBNP and selected echocardiography parameters at rest and after exercise in patients with functional ischemic mitral regurgitation qualified for cardiosurgical treatmentReal-time three-dimensional TEEP1180Vena contracta area for severity grading in functional and degenerative mitral regurgitation: A study based on transesophageal 3D colour Doppler in 419 patientsP1181Proximal flow convergence by 3D echocardiography in the evaluation of mitral valve area in rheumatic mitral stenosisP1182Quantification of valve dimensions by transesophageal 3D echocardiography in patients with functional and degenerative mitral regurgitationTissue Doppler and speckle trackingP1183Automatic calculation of left ventricular volume changes over a cardiac cycle from echocardiography images by nonlinear dimensionality reductionP1184Effect of the mitral valve repairs on the left ventricular blood flow formationP1185Quantification of left atrial strain using cardiovascular magnetic resonance. a comparison between hypertrophic cardiomyopathy and healthy controlsP1186The role of early systolic lengthening in patients with non-ST elevation acute coronary syndrome and its relation to syntax scoreP1187Different standard two dimensional strain methods to quantity left ventricular mechanicsP1188Atrial function and electrocardiography caracteristics in sportsmen with or without paroxysmal atrial fibrillationP1189Right ventricular outflow premature contractions induce regional left ventricular dysfunctionP1190Ultrasound guided venous access for pacemaker and defibrillators. Randomized TrialP1191Atrial function analysis correlates with symptoms and quality of life of heart failure patientsP1192The use of tissue doppler echocardiography in myocardial iron overload in patients with thalassaemia majorP1193Independent association between pulse pressure and left ventricular global longitudinal strainP1194Global and regional longitudinal strain identifies the presence of coronary artery disease in patients with suspected reduction of coronary flow reserve and absence of wall motion abnormalitiesP1195Prognostic value of invasive and noninvasive parameters of right ventricular function in patients with pulmonary arterial hypertension receiving specific vasodilator therapyP1196Myocardial deformation analysis to improve arrhythmic risk stratificationP1197Quantitative assessment of regional systolic and diastolic function parameters for detecting prior transient ischemia in normokinetic segmentsP1198Left atrial function in patients with corrected tetralogy of Fallot - a three-dimensional speckle-tracking echocardiographic studyP1199Left atrial ejection force correlates with left atrial strain and volume-based functional properties as assessed by three-dimensional speckle tracking echocardiographyP1200Acute angulation of the aortic arch late after the arterial switch operation for transposition of the great arteries: impact on cardiac mechanicsP1201Circumferential deformation of the ascending thoracic aorta in hypertensive patients by three-dimensional speckle tracking echocardiographyCardiac Magnetic ResonanceP1202The incremental value of cardiac magnetic resonance on diagnosis myocardial infarction and non-obstructed coronary arteriesP1204Reference ranges of global and regional myocardial T1 values derived from MOLLI and shMOLLI at 3TComputed Tomography & Nuclear CardiologyP1205Deformation of the left atrial appendage after percutaneous closure with the Amplatzer cardiac plugP1206Prognostic impact of non-obstructive coronary artery disease on coronary computed tomographic angiography: A single-center study. Eur Heart J Cardiovasc Imaging 2015. [DOI: 10.1093/ehjci/jev275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
16
|
Rowley SE, Hadjimichael M, Ali MN, Durmaz YC, Lashley JC, Cava RJ, Scott JF. Quantum criticality in a uniaxial organic ferroelectric. J Phys Condens Matter 2015; 27:395901. [PMID: 26360383 DOI: 10.1088/0953-8984/27/39/395901] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Tris-sarcosine calcium chloride (TSCC) is a highly uniaxial ferroelectric with a Curie temperature of approximately 130 K. By suppressing ferroelectricity with bromine substitution on the chlorine sites, pure single crystals were tuned through a ferroelectric quantum phase transition. The resulting quantum critical regime was investigated in detail and was found to persist up to temperatures of at least 30-40 K. The nature of long-range dipole interactions in uniaxial materials, which lead to non-analytical terms in the free-energy expansion in the polarization, predict a dielectric susceptibility varying as 1/T(3)close to the quantum critical point. Rather than this, we find that the dielectric susceptibility varies as 1/T(2) as expected and observed in better known multi-axial systems. We explain this result by identifying the ultra-weak nature of the dipole moments in the TSCC family of crystals. Interestingly, we observe a shallow minimum in the inverse dielectric function at low temperatures close to the quantum critical point in paraelectric samples that may be attributed to the coupling of quantum polarization and strain fields. Finally, we present results of the heat capacity and electro-caloric effect and explain how the time dependence of the polarization in ferroelectrics and paraelectrics should be considered when making quantitative estimates of temperature changes induced by applied electric fields.
Collapse
Affiliation(s)
- S E Rowley
- Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge, CB3 0HE, UK. CBPF, Rua Dr Xavier Sigaud 150, Urca, Rio de Janeiro, 22290-180, Brazil
| | | | | | | | | | | | | |
Collapse
|
17
|
Yankowitz M, Larentis S, Kim K, Xue J, McKenzie D, Huang S, Paggen M, Ali MN, Cava RJ, Tutuc E, LeRoy BJ. Intrinsic disorder in graphene on transition metal dichalcogenide heterostructures. Nano Lett 2015; 15:1925-1929. [PMID: 25665012 DOI: 10.1021/nl5047736] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Semiconducting transition metal dichalchogenides (TMDs) are a family of van der Waals bonded materials that have recently received interest as alternative substrates to hexagonal boron nitride (hBN) for graphene, as well as for components in novel graphene-based device heterostructures. We elucidate the local structural and electronic properties of graphene on TMD heterostructures through scanning tunneling microscopy and spectroscopy measurements. We find that crystalline defects intrinsic to TMDs induce substantial electronic scattering and charge carrier density fluctuations in the graphene. These signatures of local disorder explain the significant degradation of graphene device mobilities using TMD substrates, particularly compared to similar graphene on hBN devices.
Collapse
Affiliation(s)
- Matthew Yankowitz
- Physics Department, University of Arizona , Tucson, Arizona 85721, United States
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Liang T, Gibson Q, Ali MN, Liu M, Cava RJ, Ong NP. Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd3As2. Nat Mater 2015; 14:280-284. [PMID: 25419815 DOI: 10.1038/nmat4143] [Citation(s) in RCA: 317] [Impact Index Per Article: 35.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Accepted: 10/20/2014] [Indexed: 05/28/2023]
Abstract
Dirac and Weyl semimetals are 3D analogues of graphene in which crystalline symmetry protects the nodes against gap formation. Na3Bi and Cd3As2 were predicted to be Dirac semimetals, and recently confirmed to be so by photoemission experiments. Several novel transport properties in a magnetic field have been proposed for Dirac semimetals. Here, we report a property of Cd3As2 that was unpredicted, namely a remarkable protection mechanism that strongly suppresses backscattering in zero magnetic field. In single crystals, the protection results in ultrahigh mobility, 9 × 10(6) cm(2) V(-1) s(-1) at 5 K. Suppression of backscattering results in a transport lifetime 10(4) times longer than the quantum lifetime. The lifting of this protection by the applied magnetic field leads to a very large magnetoresistance. We discuss how this may relate to changes to the Fermi surface induced by the applied magnetic field.
Collapse
Affiliation(s)
- Tian Liang
- Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
| | - Quinn Gibson
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - Mazhar N Ali
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - Minhao Liu
- Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
| | - R J Cava
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - N P Ong
- Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
| |
Collapse
|
19
|
Pletikosić I, Ali MN, Fedorov AV, Cava RJ, Valla T. Electronic structure basis for the extraordinary magnetoresistance in WTe2. Phys Rev Lett 2014; 113:216601. [PMID: 25479512 DOI: 10.1103/physrevlett.113.216601] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Indexed: 05/13/2023]
Abstract
The electronic structure basis of the extremely large magnetoresistance in layered nonmagnetic tungsten ditelluride has been investigated by angle-resolved photoelectron spectroscopy. Hole and electron pockets of approximately the same size were found at low temperatures, suggesting that carrier compensation should be considered the primary source of the effect. The material exhibits a highly anisotropic Fermi surface from which the pronounced anisotropy of the magnetoresistance follows. A change in the Fermi surface with temperature was found and a high-density-of-states band that may take over conduction at higher temperatures and cause the observed turn-on behavior of the magnetoresistance in WTe2 was identified.
Collapse
Affiliation(s)
- I Pletikosić
- Department of Physics, Princeton University, Princeton, New Jersey 08544, USA and Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Mazhar N Ali
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - A V Fedorov
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - R J Cava
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - T Valla
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| |
Collapse
|
20
|
Seibel EM, Roudebush JH, Ali MN, Ross KA, Cava RJ. Structure and Magnetic Properties of the Spin-1/2-Based Honeycomb NaNi2BiO6-δ and Its Hydrate NaNi2BiO6-δ·1.7H2O. Inorg Chem 2014; 53:10989-95. [DOI: 10.1021/ic501390r] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Elizabeth M. Seibel
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - John H. Roudebush
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Mazhar N. Ali
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - K. A. Ross
- Institute for Quantum Matter and Department
of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, United States
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - R. J. Cava
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| |
Collapse
|
21
|
Ali MN, Xiong J, Flynn S, Tao J, Gibson QD, Schoop LM, Liang T, Haldolaarachchige N, Hirschberger M, Ong NP, Cava RJ. Large, non-saturating magnetoresistance in WTe2. Nature 2014; 514:205-8. [DOI: 10.1038/nature13763] [Citation(s) in RCA: 1137] [Impact Index Per Article: 113.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Accepted: 07/28/2014] [Indexed: 11/09/2022]
|
22
|
Lashley JC, Munns JHD, Echizen M, Ali MN, Rowley SE, Scott JF. Phase transitions in the brominated ferroelectric tris-sarcosine calcium chloride. Adv Mater 2014; 26:3860-3866. [PMID: 24789107 DOI: 10.1002/adma.201305065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 02/24/2014] [Indexed: 06/03/2023]
Affiliation(s)
- J C Lashley
- Los Alamos National Laboratory, Los Alamos, New Mexico 1663, 87545, USA; Cavendish Laboratory, Cambridge University, J. J. Thomson Avenue, Cambridge, CB3 0HE, England
| | | | | | | | | | | |
Collapse
|
23
|
Ali MN, Ali MNA, Syed A, Syed AB, Bhandari S, Bhandari SC. Case series: hemolytic uremic syndrome--another cause of transplant dysfunction. Transplant Proc 2014; 45:3284-8. [PMID: 24182801 DOI: 10.1016/j.transproceed.2013.07.060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2013] [Revised: 07/14/2013] [Accepted: 07/17/2013] [Indexed: 11/30/2022]
Abstract
BACKGROUND Renal transplantation is the optimal treatment for suitable patients with end-stage renal disease (ESRD). However, acute graft dysfunction occurs in 5%-35% of patients. This is commonly due to acute rejection, drug toxicity, ureteric obstruction, or infection. Atypical hemolytic uremic syndrome (aHUS), either recurrent or de novo, is uncommon after transplantation. CASES We highlight three cases of acute transplant dysfunction in which transplant biopsy revealed HUS without associated clinical or hematologic clues to the etiology. Two cases had recurrent HUS and 1 had de novo HUS secondary to tacrolimus therapy. Screenings for ADAMTS-13 and gene mutations of complement regulatory proteins were negative. Thrombocytopenia and red blood cell fragments on blood film appeared some days later. TREATMENT Treatment comprised a combination of plasma exchange with fresh-frozen plasma and switching immunosuppressive therapy, which led to the recovery of the above hematologic features but salvaged graft function in only 1 case. CONCLUSIONS Classical hematologic findings of HUS appeared late in these cases. HUS should be considered in cases of allograft dysfunction where there is no obvious cause, and biopsy should be performed. This enables early initiation of therapy to gain rapid recovery of hematologic parameters and potentially of transplant function.
Collapse
Affiliation(s)
| | - M N A Ali
- Department of Renal Medicine, Hull and East Yorkshire Hospitals, NHS Trust, and Hull and York Medical School, Hull, East Yorkshire, United Kingdom
| | | | | | | | | |
Collapse
|
24
|
Gibson QD, Evtushinsky D, Yaresko AN, Zabolotnyy VB, Ali MN, Fuccillo MK, Van den Brink J, Büchner B, Cava RJ, Borisenko SV. Quasi one dimensional Dirac electrons on the surface of Ru₂Sn₃. Sci Rep 2014; 4:5168. [PMID: 24893841 PMCID: PMC4044652 DOI: 10.1038/srep05168] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 05/14/2014] [Indexed: 11/09/2022] Open
Abstract
We present an ARPES study of the surface states of Ru2Sn3, a new type of a strong 3D topological insulator (TI). In contrast to currently known 3D TIs, which display two-dimensional Dirac cones with linear isotropic dispersions crossing through one point in the surface Brillouin Zone (SBZ), the surface states on Ru2Sn3 are highly anisotropic, displaying an almost flat dispersion along certain high-symmetry directions. This results in quasi-one dimensional (1D) Dirac electronic states throughout the SBZ that we argue are inherited from features in the bulk electronic structure of Ru2Sn3 where the bulk conduction bands are highly anisotropic. Unlike previous experimentally characterized TIs, the topological surface states of Ru2Sn3 are the result of a d-p band inversion rather than an s-p band inversion. The observed surface states are the topological equivalent to a single 2D Dirac cone at the surface Brillouin zone.
Collapse
Affiliation(s)
- Q. D. Gibson
- Department of Chemistry, Princeton University, Princeton, New Jersey, 08544, USA
| | - D. Evtushinsky
- Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01069 Dresden, Germany
| | - A. N. Yaresko
- Max-Planck-Institut für Festkörperforschung Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - V. B. Zabolotnyy
- Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01069 Dresden, Germany
| | - Mazhar N. Ali
- Department of Chemistry, Princeton University, Princeton, New Jersey, 08544, USA
| | - M. K. Fuccillo
- Department of Chemistry, Princeton University, Princeton, New Jersey, 08544, USA
| | - J. Van den Brink
- Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01069 Dresden, Germany
| | - B. Büchner
- Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01069 Dresden, Germany
- Institute for Solid State Physics, Technical University Dresden, D-01171 Dresden, Germany
| | - R. J. Cava
- Department of Chemistry, Princeton University, Princeton, New Jersey, 08544, USA
| | - S. V. Borisenko
- Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01069 Dresden, Germany
| |
Collapse
|
25
|
Ali MN, Gibson Q, Jeon S, Zhou BB, Yazdani A, Cava RJ. The Crystal and Electronic Structures of Cd3As2, the Three-Dimensional Electronic Analogue of Graphene. Inorg Chem 2014; 53:4062-7. [DOI: 10.1021/ic403163d] [Citation(s) in RCA: 161] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Mazhar N. Ali
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Quinn Gibson
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Sangjun Jeon
- Joseph
Henry Laboratories and Department of Physics, Princeton University, Princeton, New Jersey 08544, United States
| | - Brian B. Zhou
- Joseph
Henry Laboratories and Department of Physics, Princeton University, Princeton, New Jersey 08544, United States
| | - Ali Yazdani
- Joseph
Henry Laboratories and Department of Physics, Princeton University, Princeton, New Jersey 08544, United States
| | - R. J. Cava
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| |
Collapse
|
26
|
Seibel EM, Roudebush JH, Wu H, Huang Q, Ali MN, Ji H, Cava RJ. Structure and Magnetic Properties of the α-NaFeO2-Type Honeycomb Compound Na3Ni2BiO6. Inorg Chem 2013; 52:13605-11. [DOI: 10.1021/ic402131e] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elizabeth M. Seibel
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - J. H. Roudebush
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Hui Wu
- NIST Center for Neutron Research, Gaithersburg, Maryland 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College
Park, Maryland 20742-2115, United States
| | - Qingzhen Huang
- NIST Center for Neutron Research, Gaithersburg, Maryland 20899-6102, United States
| | - Mazhar N. Ali
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Huiwen Ji
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - R. J. Cava
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| |
Collapse
|
27
|
|
28
|
Ali MN, Onyeanusi BI, Ojo SA, Ayo JO, Maidawa SM, Imam J. Biometric and morphologic studies of the female reproductive organs of the African giant rat (Cricetomys gambianus: Waterhouse). Folia Morphol (Warsz) 2010; 69:213-215. [PMID: 21120807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Different segments of the reproductive tract of 100 adult, non-pregnant, female African giant rats (AGR) were carefully examined, weighed, and measured. The ovaries were observed to be small, pinkish, and kidney-shaped. The uterus of the AGR was found to be uterus duplex. The live weight of the AGR was 999.7 ± 16.86 g. The weight, length, and width of the ovary were 0.095 ± 0.003 g, 0.750 ± 0.01 cm, and 0.01± 0.02 cm, respectively. The length of the oviduct, uterus, and vagina/vestibule were 4.44 ± 0.06 cm, 4.877 ± 0.11 cm, and 4.345 ± 0.07 cm, respectively. The weight and length of the entire tubular organs were 3.171 ± 0.01 g and 13.559 ± 0.18 cm with corresponding range values of 1.61-7.10 g and 7.80-17.40 cm, respectively.
Collapse
Affiliation(s)
- M N Ali
- Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria.
| | | | | | | | | | | |
Collapse
|
29
|
Ali MN, Garcia MA, Parsons-Moss T, Nitsche H. Polymer-assisted deposition of homogeneous metal oxide films to produce nuclear targets. Nat Protoc 2010; 5:1440-6. [DOI: 10.1038/nprot.2010.105] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
30
|
Ali MN. The influence of disease prevalence on screening for AMD. Eye (Lond) 2007; 21:253; author reply 253-4. [PMID: 16763649 DOI: 10.1038/sj.eye.6702484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
31
|
|
32
|
Begum R, Begum A, Johanson R, Ali MN, Akhter S. A low dose ("Dhaka") magnesium sulphate regime for eclampsia. Acta Obstet Gynecol Scand 2001; 80:998-1002. [PMID: 11703195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
BACKGROUND Eclampsia remains a common cause of maternal death in Bangladesh. Early experience of magnesium sulphate use for eclampsia in Bangladesh was based on a lower dose regime, tailored for use in the smaller woman. OBJECTIVES a) To determine the recurrent convulsion rate with the low dose "Dhaka" magnesium sulphate regime (recognizing the limitations of sample size). b) To identify whether toxicity occurs with this regime. c) To measure serum level of magnesium with this regime. METHODS This prospective study included 65 eclamptic patients receiving lower dose magnesium sulphate therapy at Dhaka Medical College Hospital from 25 March 1998-15 June 1998. The loading dose of magnesium sulphate was 10 gm. Following this 2.5 gm was given intramuscularly 4 hourly, for 24 hours after administration of the first dose. Four blood samples were collected for serum magnesium levels. Patients were monitored hourly by observing their respiratory rate, knee jerks and urinary output. Findings were matched with serum magnesium levels. RESULTS The range of serum magnesium levels was 1.74 to 6 mg/dl with mean (s.d.) values of 3.87 (0.78). Only five (9%) patients had diminished knee jerks 6, 10, 12, 12 and 15 hours after administration of the loading dose. But at those times the serum magnesium levels were 3.2 mg/dl, 3.8/dl, 3.4 mg/dl and 3.3 mg/dl respectively. Of the 65 patients, only one developed recurrent convulsions. This was 3 hours after the loading dose and was controlled by diazepam treatment and maintenance magnesium sulphate. CONCLUSION Half of the standard dose of magnesium sulphate appeared to be sufficient to control convulsions effectively and serum levels of magnesium remained lower than levels which produce toxicity.
Collapse
Affiliation(s)
- R Begum
- Department of Obstetrics and Gynaecology, Dhaka Medical College and Hospital, Dhaka, Bangladesh
| | | | | | | | | |
Collapse
|
33
|
Abstract
The potential armamentarium of agents used in the treatment of acute coronary syndromes continues to expand, including such well-tested agents as aspirin, unfractionated heparin, and earlier-generation fibrinolytic agents, and newer agents such as low-molecular-weight heparins, direct thrombin inhibitors, thienopyridines, platelet glycoprotein IIb/IIIa receptor inhibitors, and bolus-administration fibrinolytic agents. Older and newer antithrombotic agents have undergone and continue to undergo intensive clinical investigation in patients with the clinical spectrum of acute coronary syndromes, which includes unstable angina, non-Q-wave (non-ST-segment elevation) myocardial infarction, and ST-segment elevation myocardial infarction. These studies, often conducted on an international scope and involving thousands of patients, provide data allowing practitioners to optimize the care of patients with acute coronary syndromes. In this article, studies of these established and newer agents in the treatment of patients with acute coronary syndromes are reviewed critically and summarized. Recommendations regarding use of antithrombotic agents in patients with acute coronary syndromes are then given.
Collapse
Affiliation(s)
- G N Levine
- Section of Cardiology 3C-330, Houston VA Medical Center (111b), 2002 Holcombe Blvd, Houston, TX 77030, USA.
| | | | | |
Collapse
|
34
|
Mickelson JK, Ali MN, Kleiman NS, Lakkis NM, Chow TW, Hughes BJ, Smith CW. Chimeric 7E3 Fab (ReoPro) decreases detectable CD11b on neutrophils from patients undergoing coronary angioplasty. J Am Coll Cardiol 1999; 33:97-106. [PMID: 9935015 DOI: 10.1016/s0735-1097(98)00532-4] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVES The purpose of this study was to monitor the effects of chimeric 7E3 Fab (ReoPro) on leukocyte and platelet activation and interaction during coronary angioplasty. BACKGROUND Increased expression of CD11b on monocytes and neutrophils promotes their adhesion to endothelial cells, extracellular matrix and smooth muscle cells. Thrombin-activated platelets adhere via P-selectin to monocytes and neutrophils. These cell interactions may affect the outcome of coronary angioplasty. METHODS During coronary angioplasty, venous blood was obtained for flow cytometric detection of leukocyte CD11b; platelet CD41a, CD61a and CD62P; the percentage of leukocytes with adherent platelets and the intensity of bound platelet fluorescence. RESULTS Leukocyte CD11b expression increased after angioplasty in control patients (neutrophils 171+/-25 to 255+/-31 mean fluorescence intensity [MFI, mean+/-SEM], n=25, p < 0.0001; monocytes 200+/-40 to 248+/-36 MFI, n=17, p < 0.05) and decreased in the patients selected to receive chimeric 7E3 Fab (neutrophils 146+/-30 to 82+/-22 MFI, n=25, p < 0.0001; monocytes 256+/- 53 to 160+/-38 MFI, n= 17, p < 0.05). Neutrophil CD11b decreased after in vitro incubation of whole blood with chimeric 7E3 Fab (n=5, p=0.01), but fMLP-induced increases in CD11b were not prevented. The CD11b expression was unchanged and increased with fMLP stimulation after in vitro incubation of isolated neutrophils with chimeric 7E3 Fab. Direct-labeled chimeric 7E3 Fab was not detected bound to neutrophils in whole blood or isolated cells using flow cytometric techniques. Adhesion of isolated neutrophils to protein-coated glass was not prevented by in vitro incubation with chimeric 7E3 Fab. Platelet activation increased after angioplasty in control patients (CD62P 8.9+/-0.8 to 12.3+/-1.2 MFI, n=25, p < 0.05; CD41a 382+/-25 to 454+/-26 MFI, n=25, p < 0.05, CD61a 436+/-52 to 529+/-58 MFI, n=11, p < 0.05); it did not increase in the patients selected to receive chimeric 7E3 Fab (CD62P 13.2+/-1.0 to 9.0+/-0.9 MFI, n=25, p < 0.05; CD61a 398+/-32 to 410+/-38 MFI, n=7, p=NS). Leukocytes with adherent platelets tended to increase in the control group of patients and decrease after the procedure in patients selected to receive chimeric 7E3 Fab; individual and procedure-related variability were marked. CONCLUSIONS Despite standard aspirin and heparin therapy, leukocyte and platelet activation with platelet adherence to leukocytes occurs after coronary angioplasty. Although chimeric 7E3 Fab does not bind to leukocytes directly, it influences CD11b expression in whole blood. Modulation of platelet and leukocyte activation and interaction by chimeric 7E3 Fab may contribute to an improved outcome after coronary angioplasty.
Collapse
Affiliation(s)
- J K Mickelson
- Department of Medicine, Baylor College of Medicine, Veterans Administration Medical Center, Houston, Texas 77030, USA
| | | | | | | | | | | | | |
Collapse
|
35
|
Levine GN, Ali MN. The role of percutaneous revascularization in the treatment of ischemic heart disease: insights from published reports and randomized clinical trials. Chest 1997; 112:805-21. [PMID: 9315818 DOI: 10.1378/chest.112.3.805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Affiliation(s)
- G N Levine
- Section of Cardiology, Houston Veterans Affairs Medical Center and the Baylor College of Medicine, 77030, USA
| | | |
Collapse
|
36
|
Levine G, Khan MM, Kleiman NS, Raizner AE, Jeroudi MO, Mickelson J, Ali MN. Use of bare-mounted Palmaz-Schatz stents employing the stent saddle technique on the delivery balloon: a single center experience. Cathet Cardiovasc Diagn 1997; 41:361-8. [PMID: 9258473 DOI: 10.1002/(sici)1097-0304(199708)41:4<361::aid-ccd1>3.0.co;2-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The major limitations of the Palmaz-Schatz stent stem from the design of its stent delivery system (SDS). The SDS is bulky and has poor trackability in lesions with proximal tortuosity and/or vessel calcification. The use of bare-mounted Palmaz-Schatz stents on low profile balloons represents an alternate approach for lesions that are not accessible for stenting with the SDS. Thus we evaluated the indications, procedural success rate, and in-hospital complications of patients undergoing bare stenting at a single center between 1 October 1995 through 30 September 1996. A total of 363 coronary interventions were performed during this period, including coronary stenting in 194 vessels. In 18 of these 194 vessels, bare-mounted Palmaz-Schatz stents were used. The indications for bare stenting were: inability to deliver the Palmaz-Schatz stent on SDS for suboptimal angioplasty results or acute/threatened abrupt closure; use of half stents; stenting in vessels < 3.0 mm; intermediate disease in the proximal segment that would have precluded optimal visualization of stent placement; and use of guides 7 French or smaller. Bare stenting was successful in 15 of the 18 patients (vessels) in whom it was attempted. There were no deaths, myocardial infarctions, stent thrombosis, repeat interventions, or significant bleeding in patients with successful bare stent delivery. The stents were successfully retrieved in the three patients in whom the stent could not be advanced into the target coronary segment. One of these patients had a propagated spiral dissection prior to attempts at bare stenting and required emergent bypass surgery. The remaining two patients with failed deployment had suboptimal angioplasty results but had an uncomplicated hospital course. Thus bare stenting represents an alternate percutaneous approach to tackle suboptimal procedural results and/or complications in patients who have failed stent deployment with the standard sheathed stent delivery system currently available in the United States.
Collapse
Affiliation(s)
- G Levine
- Department of Medicine, Baylor College of Medicine, Houston, Texas, USA
| | | | | | | | | | | | | |
Collapse
|
37
|
Mazur W, Ali MN, Khan MM, Dabaghi SF, DeFelice CA, Paradis P, Butler EB, Wright AE, Fajardo LF, French BA, Raizner AE. High dose rate intracoronary radiation for inhibition of neointimal formation in the stented and balloon-injured porcine models of restenosis: angiographic, morphometric, and histopathologic analyses. Int J Radiat Oncol Biol Phys 1996; 36:777-88. [PMID: 8960503 DOI: 10.1016/s0360-3016(96)00298-2] [Citation(s) in RCA: 110] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE We examined the effects of intracoronary irradiation delivered at a high dose rate on neointimal hyperplasia after injury induced by two methods: balloon overstretch injury, and stent implantation in a porcine model of coronary restenosis. METHODS AND MATERIALS In 34 Hanford miniature swine, a segment of each coronary artery was targeted for injury and treatment. The artery segments were treated with 192Ir at doses of 10 Gy over 4 min (eight animals), 15 Gy over 6 min (nine animals), 25 Gy over 10 min (nine animals) or control (simulation wire only; eight animals). The treated segments were subjected to stent implantation (left anterior descending and right coronary artery) or balloon overstretch (circumflex) injury. Twenty-eight days later, repeat coronary angiography and sacrifice were done. Quantitative coronary angiography, morphometry, and extensive histopathologic analyses were carried out in a blinded fashion. RESULTS The change in minimal lumen diameter from postinjury to presacrifice in the stent-injured left anterior descending was -0.79 +/- 0.34 (mean: +/- SD) mm in the control group, compared to -0.43 +/- 0.35 mm in the 15 Gy (p = 0.04) and -0.21 +/- 0.50 mm in the 25 Gy (p = 0.01) groups; and in the balloon-injured circumflex was -0.31 +/- 0.22 mm in the control group compared to -0.03 +/- 0.18 mm in the 10 Gy (p = 0.05) and 0.00 +/- 0.33 in the 15 Gy (p = 0.01) groups. Percent area stenosis in the left anterior descending was 36 +/- 9% in the control group compared to 18 +/- 12% in the 15 Gy (p = 0.003) and 11 +/- 11% in the 25 Gy (p < 0.001) groups; and in the circumflex was 16 +/- 10% in the control groups, compared to 5 +/- 5% in the 15 Gy (p = 0.02) and 2 +/- 2% in the 25 Gy (p = 0.009) groups. Histopathology showed a striking reduction in the amount of neointima in the irradiated arteries compared with control vessels. Other radiation effects were stromal fibrin exudate, thinning of the media, and adventitial fibrosis and leukocyte infiltration in the radiated arterial segments. CONCLUSIONS High dose rate intracoronary irradiation with 192Ir effectively inhibits intimal proliferation after stent-induced as well as balloon-overstretch injury. This shorter treatment time (4 to 10 min) may provide a clinically practical approach to the prevention of restenosis after angioplasty.
Collapse
Affiliation(s)
- W Mazur
- Department of Medicine, Baylor College of Medicine and The Methodist Hospital, Houston, TX 77030, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Abstract
BACKGROUND Thrombin-mediated vascular smooth muscle cell proliferation has been implicated in coronary restenosis. Attempts to inhibit this mitogenic activity have recently focused on non-physiologic direct thrombin inhibitors, whereas endogenous thrombin inhibitors such as antithrombin III (ATIII) have received little attention. ATIII is the main physiologic inhibitor of thrombin and may thus be a potential therapeutic agent for prevention of restenosis. METHODS Human ATIII (125 U/kg) and heparin (200 U/kg) were administered to 12 atherosclerotic swine 30 min prior to inducing restenosis by oversized stent (left anterior descending and right coronary arteries; stent-to-artery ratio approximately 1.2) and balloon injury (circumflex; balloon artery ratio approximately 1.2). Eleven control swine received only heparin every 6 h for 24 h and were subjected to similar stent and balloon injury. Quantitative coronary angiography [change in minimal lumen diameter (delta MLD)] and morphometric analysis [percentage area stenosis (PAS)] were performed 4 weeks later. RESULTS ATIII activity (mean +/- SD) of treated swine increased from a baseline of 103 +/- 10% to a peak of 266 +/- 48%, whereas trough levels were maintained at 259 +/- 55% for 72 h by drug infusions every 6 h. The delta MLD, the primary angiographic endpoint in the balloon injured vessel was -0.57 +/- 0.33 mm in heparin group versus -0.26 +/- 0.27 mm in the ATIII group (P < or = 0.03). For stented vessels the delta MLD was -0.61 +/- 0.33 mm in the heparin group versus -0.41 +/- 0.37 mm in the ATIII group (P < or = 0.06). The PAS for the balloon injured vessels was 30 +/- 12% in the heparin group versus 19 +/- 14 in the ATIII group (P < or = 0.06). In stented vessels the PAS was 45 +/- 16% in the heparin group versus 38 +/- 16% in the ATIII group (P < or = 0.1). CONCLUSION Supraphysiologic ATIII levels in combination with heparin inhibits the reduction in MLD in coronary arteries subjected to oversized balloon injury and demonstrates a beneficial trend in arteries subjected to oversized stent injury. These data provide cautious optimism for further investigation with ATIII to prevent coronary restenosis.
Collapse
Affiliation(s)
- M N Ali
- Department of Medicine, Baylor College of Medicine, Houston, Texas, USA
| | | | | | | | | | | | | |
Collapse
|
39
|
Affiliation(s)
- M N Ali
- Department of Medicine, VA Medical Center, Houston, TX 77030, USA
| | | | | |
Collapse
|
40
|
Ali MN, Jalil MA. Further study on the effect of norethisterone enanthate, an injectable contraceptive on body functions. Bangladesh Med Res Counc Bull 1978; 4:63-70. [PMID: 575036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
One hundred and fortythree healthy Bengali women have received norethisterone enanthate, as injectable contraceptive in doses of 200 mg. intramuscularly at intervals of 10 to 12 weeks. The drug have been found to be almost 100 percent effective in the control of fertility. Menstrual disturbance, e.g. amenorrhoea, irregular bleeding and spotting, appeared to be the main complaints of the clients during the initial period of the therapy; but these did not persist long. There was no ill effect of the drug on lactation. No significant change in body weight, blood pressure, platelet count, fasting blood sugar, serum cholesterol and total plasma protein level was observed following administration of norethisterone enanthate over one year.
Collapse
|
41
|
Ali MN, Kabiraj MU, Fariduddin KM. Effects of norethisterone enanthate on certain body functions. Bangladesh Med Res Counc Bull 1976; 2:139-43. [PMID: 1037372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Effects of Norethisterone Enanthate (an injectable contraceptive) on body weight, blood pressure, blood cell count, level of haemoglobin, fasting blood sugar and serum cholesterol were studied in 31 women. It was observed that in the successful acceptors the pregnancy rate was nil. No appreciable change could be found in the body functions studied.
Collapse
|