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Items from 1 to 20 out of 4,234 results

article

Phase Diagrams and Electromagnetic Propertiesof s–wave Superconductivity of the Extended Hubbard Model with the Attractive Pair–Hopping Interaction

W. R. Czart

Journal of Superconductivity and Novel Magnetism > 2019 > 32 > 7 > 1951-1966

The characteristics of the extended Hubbard model with the pair–hopping interaction J, i.e. the Penson–Kolb–Hubbard model, are analysed for the case of attractive J (J > 0). The effects of on–site U interaction on the properties of the s–wave superconducting state and mutual stability of the superconducting s–wave and magnetic orderings are examined. The electromagnetic and thermodynamic characteristics...

article

Superconductivity in transuranium elements and compounds

Jean-Christophe Griveau, Éric Colineau, J.C. Griveau, E. Colineau

Comptes rendus - Physique > 2014 > 15 > 7 > 599-615

We present here an overview of the properties of transuranium superconductors, but also of the (non-superconducting) transuranium analogues of uranium superconductors. We briefly review superconductivity in actinide elements and uranium compounds and focus in particular on the PuTX5 (T=Co,Rh; X=Ga,In) series, the largest superconducting system in actinides and NpPd5Al2, the so far unique neptunium...

article

Upper fields and critical current density of K0.58Fe1.56Se2 single crystals grown by one step technique

Zhaoshun Gao, Yanpeng Qi, Lei Wang, Chao Yao, more

Physica C: Superconductivity and its applications > 2013 > 492 > Complete > 18-20

Single crystals of K _0.58 Fe _1.56 Se ₂ were successfully synthesized by a new single step process with the onset superconducting transition temperature 31.9K. The X-ray diffraction patterns suggest that they have high crystalline quality and c-axis orientation. A possible modulation structure of Fe–vacancy along c-axis was observed. The upper critical field has been determined...

article

Valency pair and properties of 1:1 ordered perovskite-type compounds Sr ₂ MMoO ₆ (M = Mn,Fe,Co)

M. Itoh, I. Ohta, Y. Inaguma

Materials Science & Engineering B > 1996 > 41 > 1 > 55-58

In order to investigate the role of superexchange interaction among 3d and 4d orbitals of transition metal ions via oxygen ions. 1:1 ordered perovskite-type compounds Sr ₂ MMoO ₆ (M = Mn,Fe,Co) were prepared and their structures and properties were examined. Structural analysis using the powder X-ray diffraction data revealed that all of these compounds have a 1:1 ordered arrangement...

article

Anomalous High‐Temperature Superconductivity in YH₆

Ivan A. Troyan, Dmitrii V. Semenok, Alexander G. Kvashnin, Andrey V. Sadakov, more

Advanced Materials > 33 > 15 > n/a - n/a

Pressure‐stabilized hydrides are a new rapidly growing class of high‐temperature superconductors, which is believed to be described within the conventional phonon‐mediated mechanism of coupling. Here, the synthesis of one of the best‐known high‐T_C superconductors—yttrium hexahydride

I m \bar{3} m

‐YH₆ is reported, which displays a superconducting transition at ≈224 K at 166 GPa. The extrapolated upper critical...

article

Additional Flux Pinning in Sn‐Doped Nb₃Al Superconductor

Xinhua Li, Qingshuang Ma, Ji Dong, Tansir Ahamad, more

physica status solidi (RRL) – Rapid Research Letters > 15 > 4 > n/a - n/a

The Nb₃(Al_1−xSn_x) superconductor with enhanced critical current density (J_c) is prepared by the process of mechanical alloying (MA) and subsequent low‐temperature sintering and the enhancement mechanism of J_c in Nb₃(Al_1−xSn_x) is discussed. The analysis of the flux pinning force implies that there is an additional pinning mechanism apart from grain boundary pinning in Nb₃(Al_1−xSn_x). The existence...

article

Effects of Outer Shell Layer on the Electronic Transport Behaviors of Sn@SnO_x Nanoparticles

Ang Ding, Tianjun Li, Dongxing Wang, Javid Muhammad, more

physica status solidi (b) > 258 > 4 > n/a - n/a

Tin oxide‐encapsulated tin nanoparticles (Sn@SnO_x NCs) are in situ prepared by a modified DC arc‐discharge plasma process. The as‐prepared Sn@SnO_x NCs are typically 50–70 nm in diameter with 6 nm of the SnO_x shell. The diameter of Sn@SnO_x NCs is 50–80 nm and the thickness of the SnO_x shell increases to ≈25 nm after heat treatment in a vacuum tube furnace. The effect of SnO_x shell thickness on the...

article

Evidence of Phonon‐Mediated Superconductivity in LaH₁₀ at High Pressure

Artur P. Durajski, Chongze Wang, Yinwei Li, Radosław Szczȩśniak, more

Annalen der Physik > 533 > 3 > n/a - n/a

Motivated by the recent experimental discovery of the high‐critical‐temperature superconductor LaH₁₀ (250–260 K at high pressures 170–190 GPa), the influence of H isotope substitution on the phonon spectra, electron–phonon interactions, and thermodynamic properties of superconducting LaH

_{10 - x}

D_x (

x = 0, 2, 5, 8, 10

) at 250 GPa are studied. On the basis of first‐principles calculations, it is found that all...

article

Electronic States of Al–Mg–Zn Quasicrystal and Its Approximant Based on First‐Principles Calculations

Masaki Saito, Takuya Sekikawa, Yoshiaki Ōno

physica status solidi (b) > 257 > 11 > n/a - n/a

First‐principles calculations are performed to investigate the electronic states of 1/1 and 2/1 approximants with the composition Al₁₅Zn₄₀Mg₄₅, which is close to the quasicrystal (QC) Al_14.9Zn_41.0Mg_44.1 in which the superconductivity recently has been discovered. The density of states for the 1/1 approximant shows a wide pseudogap structure near the Fermi level as commonly observed in various approximants...

article

Kriomoduły w akceleratorach cząstek naładowanych

Jacek Sosnowski, Paweł Krawczyk

Elektronika : konstrukcje, technologie, zastosowania > 2020 > Vol. 61, nr 10 > 22--26

W artykule przybliżono problematykę kriomodułów, urządzeń stosowanych w akceleratorach cząstek naładowanych. Podkreślono znaczenie wykorzystania materiałów nadprzewodnikowych w ich konstrukcji i zalety takich rozwiązań. Usystematyzowano specyfikę występujących tu zagadnień i wskazano przykłady zastosowania.

article

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Elena Gati, Li Xiang, Sergey L. Bud'ko, Paul C. Canfield

Annalen der Physik > 532 > 10 > n/a - n/a

Iron‐based superconductors are well‐known for their intriguing phase diagrams, which manifest a complex interplay of electronic, magnetic, and structural degrees of freedom. Among the phase transitions observed are superconducting, magnetic, and several types of structural transitions, including a tetragonal‐to‐orthorhombic and a collapsed‐tetragonal transition. In particular, the widely observed...

article

Superhigh Uniform Magnetic Cr Substitution in a 2D Mo₂C Superconductor for a Macroscopic‐Scale Kondo Effect

Chuan Xu, Zhen Liu, Zongyuan Zhang, Zhibo Liu, more

Advanced Materials > 32 > 38 > n/a - n/a

Substitutional doping provides an effective strategy to tailor the properties of 2D materials, but it remains an open challenge to achieve tunable uniform doping, especially at high doping level. Here, uniform lattice substitution of a 2D Mo₂C superconductor by magnetic Cr atoms with controlled concentration up to ≈46.9 at% by chemical vapor deposition and a specifically designed Cu/Cr/Mo trilayer...

article

Long‐Range Ordered Amorphous Atomic Chains as Building Blocks of a Superconducting Quasi‐One‐Dimensional Crystal

Chao An, Yonghui Zhou, Chunhua Chen, Fucong Fei, more

Advanced Materials > 32 > 38 > n/a - n/a

Crystalline and amorphous structures are two of the most common solid‐state phases. Crystals having orientational and periodic translation symmetries are usually both short‐range and long‐range ordered, while amorphous materials have no long‐range order. Short‐range ordered but long‐range disordered materials are generally categorized into amorphous phases. In contrast to the extensively studied crystalline...

article

Superconductivity: Long‐Range Ordered Amorphous Atomic Chains as Building Blocks of a Superconducting Quasi‐One‐Dimensional Crystal (Adv. Mater. 38/2020)

Chao An, Yonghui Zhou, Chunhua Chen, Fucong Fei, more

Advanced Materials > 32 > 38 > n/a - n/a

Crystalline and amorphous structures are two of the most common solid‐state phases. The combination of short‐range disordered and long‐range ordered structures at the atomic level is extremely rare. In article number 2002352, Xuliang Chen, Gufei Zhang, Zhaorong Yang, and co‐workers develop a system with long‐range ordered but short‐range disordered building blocks by compressing a linear chain compound...

article

In Search of Chiral Molecular Superconductors: κ‐[(S,S)‐DM‐BEDT‐TTF]₂ClO₄ Revisited

Nabil Mroweh, Cécile Mézière, Flavia Pop, Pascale Auban‐Senzier, more

Advanced Materials > 32 > 36 > n/a - n/a

The relationship between chirality and superconductivity is an intriguing question. The two enantiomeric crystalline radical cation salts κ‐[(S,S)‐DM‐BEDT‐TTF]₂ClO₄ and κ‐[(R,R)‐DM‐BEDT‐TTF]₂ClO₄, showing κ‐type arrangement of the organic layers, are investigated in search for superconducting chiral molecular materials following a 1992 report indicating the occurrence of a superconducting transition...

article

Proximity‐Effect‐Induced Superconductivity in Nb/Sb₂Te₃‐Nanoribbon/Nb Junctions

Jinzhong Zhang, Abdur Rehman Jalil, Pok‐Lam Tse, Jonas Kölzer, more

Annalen der Physik > 532 > 8 > n/a - n/a

Nanohybrid superconducting junctions using antimony telluride (Sb₂Te₃) topological insulator nanoribbons and Nb superconducting electrodes are fabricated using electron beam lithography and magnetron sputtering. The effects of bias current, temperature, and magnetic field on the transport properties of the junctions in a four‐terminal measurement configuration are investigated. Two features are observed...

article

Ferroelectric Exchange Bias Affects Interfacial Electronic States

Gal Tuvia, Yiftach Frenkel, Prasanna K. Rout, Itai Silber, more

Advanced Materials > 32 > 29 > n/a - n/a

In polar oxide interfaces phenomena such as superconductivity, magnetism, 1D conductivity, and quantum Hall states can emerge at the polar discontinuity. Combining controllable ferroelectricity at such interfaces can affect the superconducting properties and sheds light on the mutual effects between the polar oxide and the ferroelectric oxide. Here, the interface between the polar oxide LaAlO₃ and...

article

Elektromagnesy nadprzewodzące w urządzeniach jądrowych i metody ich zabezpieczeń

Jacek Sosnowski, Paweł Krawczyk

Elektronika : konstrukcje, technologie, zastosowania > 2020 > Vol. 61, nr 5 > 10--14

W artykule przedyskutowano rozwój problematyki elektromagnesów nadprzewodzących oraz stan obecny ich wykorzystania w urządzeniach jądrowych, szczególnie w fizyce jądrowej głównie w formie akceleratorów, jak też w medycynie. Omówiono metody zabezpieczenia elektromagnesów nadprzewodzących przed rozchodzeniem sie strefy rezystywnej, co zilustrowano na przykładzie słynnego incydentu, który miał miejsce...

article

Theoretical Explanation of Electric Field‐Induced Superconductive Critical Temperature Shifts in Indium Thin Films

Giovanni A. Ummarino, Davide Romanin

physica status solidi (b) > 257 > 5 > n/a - n/a

Herein, ab initio density functional theory computations and the self‐consistent solution of one‐band s‐wave generalized Eliashberg equations with proximity effect are combined to explain 60 years old experimental data on how a static electric field can affect the superconductive critical temperature of indium thin films. Although electronic densities of states, Fermi energy shifts, and Eliashberg...

article

Function Follows Form: From Semiconducting to Metallic toward Superconducting PbS Nanowires by Faceting the Crystal

Mohammad Mehdi Ramin Moayed, Sascha Kull, Angelique Rieckmann, Philip Beck, more

Advanced Functional Materials > 30 > 19 > n/a - n/a

In the realm of colloidal nanostructures, with their immense capacity for shape and dimensionality control, the form is undoubtedly a driving factor for the tunability of optical and electrical properties in semiconducting or metallic materials. However, influencing the fundamental properties is still challenging and requires sophisticated surface or dimensionality manipulation. Such a modification...

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Phase Diagrams and Electromagnetic Propertiesof s–wave Superconductivity of the Extended Hubbard Model with the Attractive Pair–Hopping Interaction

Superconductivity in transuranium elements and compounds

Upper fields and critical current density of K0.58Fe1.56Se2 single crystals grown by one step technique

Valency pair and properties of 1:1 ordered perovskite-type compounds Sr ₂ MMoO ₆ (M = Mn,Fe,Co)

Anomalous High‐Temperature Superconductivity in YH₆

Additional Flux Pinning in Sn‐Doped Nb₃Al Superconductor

Effects of Outer Shell Layer on the Electronic Transport Behaviors of Sn@SnO_x Nanoparticles

Evidence of Phonon‐Mediated Superconductivity in LaH₁₀ at High Pressure

Electronic States of Al–Mg–Zn Quasicrystal and Its Approximant Based on First‐Principles Calculations

Kriomoduły w akceleratorach cząstek naładowanych

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Superhigh Uniform Magnetic Cr Substitution in a 2D Mo₂C Superconductor for a Macroscopic‐Scale Kondo Effect

Long‐Range Ordered Amorphous Atomic Chains as Building Blocks of a Superconducting Quasi‐One‐Dimensional Crystal

Superconductivity: Long‐Range Ordered Amorphous Atomic Chains as Building Blocks of a Superconducting Quasi‐One‐Dimensional Crystal (Adv. Mater. 38/2020)

In Search of Chiral Molecular Superconductors: κ‐[(S,S)‐DM‐BEDT‐TTF]₂ClO₄ Revisited

Proximity‐Effect‐Induced Superconductivity in Nb/Sb₂Te₃‐Nanoribbon/Nb Junctions

Ferroelectric Exchange Bias Affects Interfacial Electronic States

Elektromagnesy nadprzewodzące w urządzeniach jądrowych i metody ich zabezpieczeń

Theoretical Explanation of Electric Field‐Induced Superconductive Critical Temperature Shifts in Indium Thin Films

Function Follows Form: From Semiconducting to Metallic toward Superconducting PbS Nanowires by Faceting the Crystal

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