scholarly journals Superconductivity in HEA-Type Compounds

2021 ◽  
Author(s):  
Yoshikazu Mizuguchi ◽  
Aichi Yamashita
Keyword(s):  
Layered Compounds ◽  
High Entropy Alloy ◽  
Synthesis Methods ◽  
Superconducting Properties ◽  
High Tc ◽  
High Entropy ◽  
Type Transition ◽  
Structural Dimensionality ◽  
Crystal Structural ◽  
High Tc Cuprates

Since the discovery of superconductivity in a high-entropy alloy (HEA) Ti-Zr-Nb-Hf-Ta in 2014, the community of superconductor science has explored new HEA superconductors to find the merit of the HEA states on superconducting properties. Since 2018, we have developed “HEA-type” compounds as superconductors or thermoelectric materials. As well known, compounds like intermetallic compounds or layered compounds are composed of multi crystallographic sites. In a HEA-type compounds, one or more sites are alloyed and total mixing entropy satisfies with the criterion of HEA. Herein, we summarize the synthesis methods, the crystal structural variation and superconducting properties of the HEA-type compounds, which include NaCl-type metal tellurides, CuAl2-type transition metal zirconides, high-Tc cuprates, and BiS2-based layered superconductors. The effects of the introduction of a HEA site in various kinds of complicated compounds are discussed from the structural-dimensionality viewpoint.

Electron-Doped Superconductivity in CuO2 Layered Compounds with Nd2CuO4− structure

1989 ◽  
Vol 156 ◽  
Author(s):  
H. Takagi ◽  
T. Ito ◽  
H. Matsubara ◽  
H. Watabe ◽  
T. Ido ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Physical Properties ◽  
Transport Coefficients ◽  
Sharp Contrast ◽  
Layered Compounds ◽  
Hole Doping ◽  
High Tc ◽  
Electron Doping ◽  
High Tc Cuprates ◽  
Effect Of Doping

ABSTRACTWe have discovered 24 K-superconductivity in a family of compounds Ln2−xCexCuO4−y (Ln=Pr, Nd, Sm). Novel feature of the superconductivity in these family of compounds is that superconductivity is produced by electron-doping in sharp contrast with high-Tc cuprates discovered so far. The effect of doping on physical properties particularly the elecronic phase diagram and transport coefficients which indicate symmetry in many respects between electron- and hole- doping is described.

scholarly journals Synthesis of RE123 high-Tc superconductors with a high-entropy-alloy-type RE site

2020 ◽  
Vol 572 ◽  
pp. 1353623 ◽  
Author(s):  
Yuta Shukunami ◽  
Aichi Yamashita ◽  
Yosuke Goto ◽  
Yoshikazu Mizuguchi
Keyword(s):  
High Entropy Alloy ◽  
High Tc Superconductors ◽  
High Tc ◽  
High Entropy ◽  
Alloy Type

CHANGES IN THE SUPERCONDUCTING PROPERTIES OF HIGH-Tc CUPRATES PRODUCED BY APPLIED ELECTRIC FIELDS

1992 ◽  
Vol 06 (10) ◽  
pp. 555-571 ◽  
Author(s):  
J. MANNHART
Keyword(s):  
Transport Properties ◽  
Electric Fields ◽  
Superconducting State ◽  
Experimental Studies ◽  
Charge Carriers ◽  
Superconducting Properties ◽  
Mobile Charge ◽  
High Tc ◽  
High Tc Cuprates

By changing the concentration of mobile charge carriers, applied electric fields influence the transport properties of high-T c superconductors in the superconducting state. Experimental studies of these effects are briefly reviewed.

scholarly journals Superconducting properties of high-entropy-alloy tellurides M-Te (M: Ag, In, Cd, Sn, Sb, Pb, Bi) with a NaCl-type structure

2020 ◽  
Vol 13 (3) ◽  
pp. 033001 ◽  
Author(s):  
Md. Riad Kasem ◽  
Kazuhisa Hoshi ◽  
Rajveer Jha ◽  
Masayoshi Katsuno ◽  
Aichi Yamashita ◽  
...  
Keyword(s):  
Type Structure ◽  
High Entropy Alloy ◽  
Superconducting Properties ◽  
High Entropy

CoCrFeNiMo High Entropy Alloy Produced by Solid State Processing

2017 ◽  
Vol 750 ◽  
pp. 15-19 ◽  
Author(s):  
Ioana Csáki ◽  
Sigrún Nanna Karlsdottir ◽  
Steluța Serghiuță ◽  
Gabriela Popescu ◽  
Mihai Buzatu ◽  
...  
Keyword(s):  
Solid State ◽  
Mechanical Alloying ◽  
Turbine Blades ◽  
High Energy ◽  
Milling Process ◽  
High Entropy Alloy ◽  
Synthesis Methods ◽  
High Entropy ◽  
Plasma Sintering ◽  
Spark Plasma

Mechanical alloying (MA) is a high-energy ball milling process results in the obtaining of simple and stable microstructures having increased homogeneity compared to other non-equilibrium synthesis methods. The aim of this paper was to develop a high entropy alloy with an improved hardness value suitable for coating turbine blades working in geothermal steam. CoCrFeNiMo high entropy alloy was processed in solid state, using mechanical alloying. After 40h milling time in a planetary ball mill the alloyed sample was consolidated using spark plasma sintering process. The samples obtained were investigated with the aid of optical and electron microscope, X ray diffraction and the hardness value was determined. The results obtained revealed that the powder was completely alloyed after 40 hour milling and the mixture between BCC and FCC phases resulted in 34% improved hardness value in comparison with a stainless steel usually used for turbine blades working in geothermal environment.

scholarly journals Effect of external pressure on the normal and superconducting properties of high-Tc cuprates

2015 ◽  
Vol 253 (3) ◽  
pp. 486-493 ◽  
Author(s):  
K. A. Sidorov ◽  
V. A. Gavrichkov ◽  
S. V. Nikolaev ◽  
Z. V. Pchelkina ◽  
S. G. Ovchinnikov
Keyword(s):  
External Pressure ◽  
Superconducting Properties ◽  
High Tc ◽  
High Tc Cuprates

Instant and Persistent Hydrogen Production Using Nano High Entropy Catalyst

2019 ◽  
Author(s):  
Nirmal Kumar ◽  
Subramanian Nellaiappan ◽  
Ritesh Kumar ◽  
Kirtiman Deo Malviya ◽  
K. G. Pradeep ◽  
...  
Keyword(s):  
Formic Acid ◽  
Minimum Energy ◽  
High Entropy Alloy ◽  
Hydrogen Energy ◽  
High Entropy ◽  
Electro Oxidation ◽  
The Individual ◽  
Novel Catalyst ◽  
Cell Anode ◽  
Fuel Cell Anode

<div>Renewable harvesting clean and hydrogen energy using the benefits of novel multicatalytic materials of high entropy alloy (HEA equimolar Cu-Ag-Au-Pt-Pd) from formic acid with minimum energy input has been achieved in the present investigation. The synthesis effect of pristine elements in the HEA drives the electro-oxidation reaction towards non-carbonaceous pathway . The atomistic simulation based on DFT rationalize the distinct lowering of the d-band center for the individual atoms in the HEA as compared to the pristine counterparts. This catalytic activity of the HEA has also been extended to methanol electro-oxidation to show the unique capability of the novel catalyst. The nanostructured HEA, properties using a combination of casting and cry omilling techniques can further be utilized as fuel cell anode in direct formic acid/methanol fuel cells (DFFE).<br></div>

Complex magnetism and magnetoresistance of Gd-Tb-Dy-Ho-Lu hexagonal high-entropy alloy

2018 ◽  
Author(s):  
Janez Dolinšek ◽  
Stanislav Vrtnik ◽  
J. Lužnik ◽  
P. Koželj ◽  
M. Feuerbacher
Keyword(s):  
High Entropy Alloy ◽  
High Entropy

Recent progress in multi-element alloy and nitride coatings sputtered from high-entropy alloy targets

2006 ◽  
Vol 31 (6) ◽  
pp. 723-736 ◽  
Author(s):  
Keng-Hao Cheng ◽  
Chia-Han Lai ◽  
Su-Jien Lin ◽  
Jien-Wei Yeh
Keyword(s):  
Recent Progress ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Nitride Coatings
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