scholarly journals Strain-tunable triple point Fermions in diamagnetic rare-earth half-Heusler alloys

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anupam Bhattacharya ◽  
Vishal Bhardwaj ◽  
Brajesh K Mani ◽  
Jayanta K Dutt ◽  
Ratnamala Chatterjee
Keyword(s):  
Rare Earth ◽  
Triple Point ◽  
Tensile Strain ◽  
Compressive Strain ◽  
Heusler Alloys ◽  
Spin Orbit Coupling ◽  
Fermi Arcs ◽  
Band Inversion ◽  
Multiple Band ◽  
Triple Points

AbstractTopologically non-trivial electronic structure is a feature of many rare-earth half-Heusler alloys, which host atoms with high spin-orbit coupling bringing in the non-triviality. In this article, using the first-principles simulations, rare-earth half-Heusler YPdBi, ScPdBi, LaPdBi, LuPdBi, YPtBi and LuPtBi alloys are studied under strain to reveal multiple band inversions associated with topological phase transitions. From our simulations we find that, as a result of first band-inversion, the Brillouin zone of the diamagnetic half-Heusler alloys hosts eight triple points whereas, the second band inversion causes the emergence of sixteen more triple points. These band-inversions are observed to be independent of the spin-orbit coupling and are the reason behind increasing occupation of bismuth 7s orbitals as volume of the unit cell increases. The surface electronic transport in different triple point semi-metallic phases is found to evolve under strain, as the number of Fermi arcs change due to multiple band inversions. Once the second band inversion occurs, further application of tensile strain does not increase the number of triple points and Fermi arcs. However, increasing tensile strain (or decreasing compressive strain) pushes the triple point crossing to higher momenta, making them more effective as source of highly mobile electrons. These observations make a pathway to tune the bulk as well as surface transport through these semi-metals by application of tensile or compressive strain depending on the unstrained relative band-inversion strength of the material.

scholarly journals Author Correction: Strain-tunable triple point Fermions in diamagnetic rare-earth half-Heusler alloys

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anupam Bhattacharya ◽  
Vishal Bhardwaj ◽  
Brajesh K. Mani ◽  
Jayanta K. Dutt ◽  
Ratnamala Chatterjee
Keyword(s):  
Rare Earth ◽  
Triple Point ◽  
Heusler Alloys

Required Linepipe Properties for High Strain Applications and Possible Resolution by Pipe Manufacturing Technology

2008 ◽  
Author(s):  
Hitoshi Asahi ◽  
Eiji Tsuru
Keyword(s):  
Tensile Strain ◽  
Compressive Strain ◽  
Bending Moment ◽  
Uniaxial Tensile ◽  
Buckling Behavior ◽  
Strain Limit ◽  
Bent Pipe ◽  
Uniaxial Tensile Stress ◽  
The Relationship ◽  
Pipe Manufacturing

Application of strain based design to pipelines in arctic or seismic areas has recently been recognized as important. So far, there has been much study performed on tensile strain limit and compressive strain limit. However, the relationship between bending buckling (compressive strain limit) and tensile strain limit has not been discussed. A model using actual stress strain curves suggests that the tensile strain limit increases as Y/T rises under uniaxial tensile stress because a pipe manufacturer usually raises TS instead of lowering YS to achieve low Y/T. Under bending of a pipe with a high D/t, an increase in compressive strain on intrados of a bent pipe at the maximum bending moment (ε-cp*) improves the tensile strain limit because the tensile strain limit is controlled by the onset of buckling or ε-cp* which is increased by lowering Y/T. On the other hand, under bending of a pipe with a low D/t, the tensile strain limit may not be influenced by improvement of buckling behavior because tensile strain on the extrados is already larger than the tensile limit at ε-cp*. Finally, we argue that the balance of major linepipe properties is important. Efforts other than the strict demands for pipe properties are also very important and inevitable to improve the strain capacity of a pipeline.

scholarly journals Square Lattice Iridates

2019 ◽  
Vol 10 (1) ◽  
pp. 315-336 ◽  
Author(s):  
Joel Bertinshaw ◽  
Y.K. Kim ◽  
Giniyat Khaliullin ◽  
B.J. Kim
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
High Temperature Superconductors ◽  
Single Layer ◽  
Square Lattice ◽  
Spin Orbit Coupling ◽  
Fermi Arcs ◽  
Firm Evidence ◽  
Energy Physics ◽  
Strong Spin

Over the past few years, Sr2IrO4, a single-layer member of the Ruddlesden–Popper series iridates, has received much attention as a close analog of cuprate high-temperature superconductors. Although there is not yet firm evidence for superconductivity, a remarkable range of cuprate phenomenology has been reproduced in electron- and hole-doped iridates including pseudogaps, Fermi arcs, and d-wave gaps. Furthermore, many symmetry-breaking orders reminiscent of those decorating the cuprate phase diagram have been reported using various experimental probes. We discuss how the electronic structures of Sr2IrO4 through strong spin-orbit coupling leads to the low-energy physics that had long been unique to cuprates, what the similarities and differences between cuprates and iridates are, and how these advance the field of high-temperature superconductivity by isolating essential ingredients of superconductivity from a rich array of phenomena that surround it. Finally, we comment on the prospect of finding a new high-temperature superconductor based on the iridate series.

Thermodynamic Analysis of Isotope Effects on Triple Points and/or Melting Temperatures

1995 ◽  
Vol 50 (4-5) ◽  
pp. 337-346
Author(s):  
W. Alexander Van Hook
Keyword(s):  
Melting Point ◽  
Physical Properties ◽  
Thermodynamic Analysis ◽  
Triple Point ◽  
Isotope Effects ◽  
Inorganic Salts ◽  
Literature Information ◽  
Melting Temperatures ◽  
Triple Points

Àbstract Available literature information on triple point or melting point isotope effects (and related physical properties) is subjected to thermodynamic analysis and consistency checks. New values for the melting point isotope effects for C6H6/CgD6 and c-C6H12/c-C6D12 are reported. 6Li/7Li melting point isotope effects reported recently by Hidaka and Lunden (Z. Naturforsch. 49 a, 475 (1994)) for various inorganic salts are questioned

Compressive strain versus tensile strain

2001 ◽  
Vol 177 (4) ◽  
pp. 238-242 ◽  
Author(s):  
C. Goyhenex ◽  
H. Bulou ◽  
J.P. Deville ◽  
G. Tréglia
Keyword(s):  
Tensile Strain ◽  
Compressive Strain

scholarly journals Enhanced photoresponse of a high-performance self-powered UV photodetector based on ZnO nanorods and a novel electrolyte by the piezo-phototronic effect

RSC Advances ◽  
2018 ◽  
Vol 8 (58) ◽  
pp. 33174-33179 ◽  
Author(s):  
Xiaoli Peng ◽  
Weihao Wang ◽  
Yiyu Zeng ◽  
Xinhua Pan ◽  
Zhizhen Ye ◽  
...  
Keyword(s):  
High Performance ◽  
Tensile Strain ◽  
Compressive Strain ◽  
Zno Nanorods ◽  
Uv Detector ◽  
Uv Photodetector ◽  
Self Powered

A flexible UV detector exhibits high performance. The photoresponse of the device under different upward angles (tensile strain) and downward angles (compressive strain) were studied. A 163% change in responsivity was obtained when the downward angle reached 60°.

scholarly journals Role and Regulation of Mechanotransductive HIF-1α Stabilisation in Periodontal Ligament Fibroblasts

2020 ◽  
Vol 21 (24) ◽  
pp. 9530
Author(s):  
Christian Kirschneck ◽  
Magdalena Thuy ◽  
Alexandra Leikam ◽  
Svenja Memmert ◽  
James Deschner ◽  
...  
Keyword(s):  
Periodontal Ligament ◽  
Tensile Strain ◽  
Tooth Movement ◽  
Compressive Strain ◽  
Mechanical Strain ◽  
Hypoxia Inducible Factor ◽  
Orthodontic Tooth Movement ◽  
Prostaglandin Synthesis ◽  
Vegf Expression ◽  
Periodontal Ligament Fibroblasts

Orthodontic tooth movement (OTM) creates compressive and tensile strain in the periodontal ligament, causing circulation disorders. Hypoxia-inducible factor 1α (HIF-1α) has been shown to be primarily stabilised by compression, but not hypoxia in periodontal ligament fibroblasts (PDLF) during mechanical strain, which are key regulators of OTM. This study aimed to elucidate the role of heparan sulfate integrin interaction and downstream kinase phosphorylation for HIF-1α stabilisation under compressive and tensile strain and to which extent downstream synthesis of VEGF and prostaglandins is HIF-1α-dependent in a model of simulated OTM in PDLF. PDLF were subjected to compressive or tensile strain for 48 h. In various setups HIF-1α was experimentally stabilised (DMOG) or destabilised (YC-1) and mechanotransduction was inhibited by surfen and genistein. We found that HIF-1α was not stabilised by tensile, but rather by compressive strain. HIF-1α stabilisation had an inductive effect on prostaglandin and VEGF synthesis. As expected, HIF-1α destabilisation reduced VEGF expression, whereas prostaglandin synthesis was increased. Inhibition of integrin mechanotransduction via surfen or genistein prevented stabilisation of HIF-1α. A decrease in VEGF expression was observed, but not in prostaglandin synthesis. Stabilisation of HIF-1α via integrin mechanotransduction and downstream phosphorylation of kinases seems to be essential for the induction of VEGF, but not prostaglandin synthesis by PDLF during compressive (but not tensile) orthodontic strain.

Three-Dimensional Topological Insulators: The Case of Inverse Heusler Compound Lu2FePb

2014 ◽  
Vol 926-930 ◽  
pp. 440-443
Author(s):  
Ning Ding ◽  
Xi Feng Liu ◽  
Xiao Tian Wang ◽  
Wen Yuan
Keyword(s):  
Function Theory ◽  
Three Dimensional ◽  
Density Function Theory ◽  
Full Potential ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Wave Method ◽  
Heusler Compound ◽  
Plane Wave Method ◽  
Band Inversion

Using the full-potential linerized augumented plane-wave method based on the density function theory, we theoretically predict the Heusler compound Lu2FePb is a new three-dimensional topological insulator system. We also point out that the spin-orbit coupling is not the leading cause but an account can add further fuel to the band inversion.

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