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16 papers · 2 filters
Artificial and self-assembled pinning centers in Ba(Fe1-xCox)2As2 thin films as a route to very high current density
C. Tarantini, S. Lee, F. Kametani +7
We report on the superior vortex pinning of single and multilayer Ba(Fe1-xCox)2As2 thin films with self-assembled c-axis and artificially introduced ab-plane pins. Ba(Fe1-xCox)2As2…
Anisotropic Impurity-States, Quasiparticle Scattering and Nematic Transport in Underdoped Ca(Fe1-xCox)2As2
M. P. Allan, T. -M. Chuang, F. Massee +9
Iron-based high temperature superconductivity develops when the `parent' antiferromagnetic/orthorhombic phase is suppressed, typically by introduction of dopant atoms. But their im…
Emergence of superconductivity from the dynamically heterogeneous insulating state in La_{2-x}Sr_{x}CuO_{4}
Xiaoyan Shi, G. Logvenov, A. T. Bollinger +3
A central issue for copper oxides is the nature of the insulating ground state at low carrier densities and the emergence of high-temperature superconductivity from that state with…
Effect of high temperature heat treatments on the quality factor of a large-grain superconducting radio-frequency niobium cavity
P. Dhakal, G. Ciovati, G. R. Myneni +10
Large-grain Nb has become a viable alternative to fine-grain Nb for the fabrication of superconducting radio-frequency cavities. In this contribution we report the results from a h…
High superconducting anisotropy and weak vortex pinning in Co doped LaFeAsO
G. Li, G. Grissonnanche, J. -Q. Yan +4
Here, we present an electrical transport study in single crystals of LaFeCoAsO ( K) under high magnetic fields. In contrast to most of the previou…
Anomalous hysteresis as an evidence for a magnetic field-induced chiral superconducting state in LiFeAs
G. Li, R. R. Urbano, P. Goswami +6
Magnetometry measurements in high quality LiFeAs single-crystals reveal a change in the sign of the magnetic hysteresis in the vicinity of the upper critical field , from a…
On the dual role of the d-electrons in iron-pnictides
Lev P. Gor'kov, Gregory B. Teitel'baum
In the stoichiometric Fe-pnictides the same d-electrons form the local moments and participate in the metallic conductivity. In the manuscript the emergence of the magnetic moments…
Pr magnetism and its interplay with the Fe spin density wave in PrFeAsO
U. Stockert, N. Leps, L. Wang +4
We have studied the magnetism of the Pr3+ ions in PrFeAsO_1-xF_x (x = 0; 0.15) and its interaction with the Fe magnetic order (for x = 0). Specific heat data confirm the presence o…
Evolution of superconducting correlations within magnetic-field-decoupled CuO(2) layers of La(1.905)Ba(0.095)CuO(4)
Z. Stegen, Su Jung Han, Jie Wu +7
We explore the evolution of superconductivity in La(2-x)Ba(x)CuO(4) with x=0.095 in magnetic fields of up to 35 T applied perpendicular to the CuO(2) planes. Previous work on this…
Dislocations and the enhancement of superconductivity in odd-parity superconductor SrRuO
Y. A. Ying, N. E. Staley, Y. Xin +6
We report observation of the enhancement of superconductivity near lattice dislocations and the absence of the strengthening of vortex pinning in odd-parity superconductor SrRu…
Strong electron-lattice coupling as the mechanism behind charge density wave transformations in transition-metal dichalcogenides
Lev P. Gor'kov
We consider single band of conduction electrons interacting with displacements of the transitional ions. In the classical regime strong enough coupling transforms the harmonic elas…
Multiband effects on beta-FeSe single crystals
Hechang Lei, D. Graf, Rongwei Hu +4
We present the upper critical fields Hc2(T) and Hall effect in beta-FeSe single crystals. The Hc2(T) increases as the temperature is lowered for field applied parallel and perpendi…
High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks
J. D. Weiss, C. Tarantini, J. Jiang +4
The K- and Co-doped BaFe2As2 (Ba-122) superconducting compounds are potentially useful for applications because they have upper critical fields (Hc2) of well over 50 T, Hc2 anisotr…
Unconventional quantum oscillations in mesoscopic rings of spin-triplet superconductor Sr2RuO4
X. Cai, Y. A. Ying, N. E. Staley +5
Odd-parity, spin-triplet superconductor Sr2RuO4 has been found to feature exotic vortex physics including half-flux quanta trapped in a doubly connected sample and the formation of…
Anisotropy of the irreversibility field for Zr-doped thin films up to 45T
C. Tarantini, J. Jaroszynski, F. Kametani +6
The anisotropic irreversibility field B of two thin films doped with additional rare earth (RE)=(Gd,Y) and Zr and containing strong correlated pins (spla…
Large and homogeneous mass enhancement in the rattling-induced superconductor KOsO
Taichi Terashima, Nobuyuki Kurita, Andhika Kiswandhi +7
We have determined the Fermi surface in KOsO ( = 9.6 K and 32 T) via de Haas-van Alphen (dHvA) oscillation measurements and a band structure calculation.…