Publications (18)
The suppression of superconductivity in MgCNi3 by Ni-site doping
M. A. Hayward, M. K. Haas, A. P. Ramirez +5
The effects of partial substitution of Cu and Co for Ni in the intermetallic perovskite superconductor MgCNi3 are reported. Calculation of the expected electronic density of states…
The Reactivity of MgB2 with Common Substrate and Electronic Materials
T. He, John M. Rowell, R. J. Cava
The reactivity of MgB2 with powdered forms of common substrate and electronic materials is reported. Reaction temperatures between 600 C and 800 C, encompassing the range commonly…
MgB2 Energy Gap Determination by Scanning Tunneling Spectroscopy
T. W. Heitmann, S. D. Bu, D. M. Kim +13
We report scanning tunneling spectroscopy (STS) measurements of the gap properties of both ceramic MgB2 and c-axis oriented epitaxial MgB2 thin films. Both show a temperature depen…
Experimental determination of superconducting parameters for the intermetallic perovskite superconductor ${\text {MgCNi}}_3
Z. Q. Mao, M. M. Rosario, K. D. Nelson +7
We have measured upper-critical-field , specific heat C, and tunneling spectra of the intermetallic perovskite superconductor MgCNi with a superconducting trans…
Carbon Concentration Dependence of the Superconducting Transition Temperature and Structure of MgCxNi3
T. G. Amos, Q. Huang, J. W. Lynn +2
The crystal structure of the superconductor MgCxNi3 is reported as a function of carbon concentration determined by powder neutron diffraction. The single-phase perovskite structur…
Core pinning by intragranular nanoprecipitates in polycrystalline MgCNi_3
L. D. Cooley, X. Song, J. Jiang +4
The nanostructure and magnetic properties of polycrystalline MgCNi_3 were studied by x-ray diffraction, electron microscopy, and vibrating sample magnetometry. While the bulk flux-…
Temperature dependence of the structural parameters of the non-oxide perovskite superconductor MgCNi3
Q. Huang, T. He, K. A. Regan +5
We report the structural parameters of superconducting MgCxNi3 (x=0.96, TC=7.3 K) as a function of temperature, from 2 K to 295 K, determined by neutron powder diffraction profile…
Loss of superconductivity and structural transition in Mg1-xAlxB2
J. S. Slusky, N. Rogado, K. A. Regan +8
The basic magnetic and electronic properties of most binary compounds have been well known for decades. Therefore the recent announcement of superconductivity at 39 K in the simple…
Magnetotransport properties of BaRuO: Observation of two scattering rates
Y. A. Ying, Y. Liu, T. He +1
We report results of low-temperature magnetotransport and Hall measurements on single crystals of four-layered hexagonal (4H) and nine-layered rhombohedral (9R) BaRuO that prov…
(13)C NMR investigation of the superconductor MgCNi_3 up to 800K
P. M. Singer, T. Imai, T. He +2
We report (13)C NMR characterization of the new superconductor MgCNi_3 (He et al., Nature (411), 54 (2001)). We found that both the uniform spin susceptibility and the spin fluctua…
The Lobster Eye Imager for Astronomy Onboard the SATech-01 Satellite
Z. X. Ling, X. J. Sun, C. Zhang +122
The Lobster Eye Imager for Astronomy (LEIA), a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe (EP) mission, was successfully launched onboard the SATech-01 sate…
Giant anharmonicity and non-linear electron-phonon coupling in MgB; A combined first-principles calculations and neutron scattering study
T. Yildirim, O. Gulseren, J. W. Lynn +12
We report first-principles calculations of the electronic band structure and lattice dynamics for the new superconductor MgB. The excellent agreement between theory and our i…
Absence of a structural transition up to 40 Gpa in MgB2 and the relevance of magnesium non-stoichiometry
P. Bordet, M. Mezouar, M. Nunez-Regueiro +8
We report measurements on MgB2 up to ~40GPa. Increasing pressure yields a monotonous decrease of the lattice parameters and of the c/a ratio, but no structural transition down to p…
Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
C. B. Eom, M. K. Lee, J. H. Choi +22
The discovery of superconductivity at 39 K in magnesium diboride offers the possibility of a new class of low-cost, high-performance superconducting materials for magnets and elect…
Superconductivity in the non-oxide Perovskite MgCNi3
T. He, Q. Huang, A. P. Ramirez +10
The oxide perovskites are a large family of materials with many important physical properties. Of particular interest has been the fact that this structure type provides an excelle…
Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
D. C. Larbalestier, M. O. Rikel, L. D. Cooley +19
The discovery of superconductivity at 39 K in MgB2[1] raises many issues. One of the central questions is whether this new superconductor resembles a high-temperature-cuprate super…
Evidence for Unconventional Superconductivity in the Non-Oxide Perovskite from Penetration Depth Measurements
R. Prozorov, A. Snezhko, T. He +1
The London penetration depth, , was measured in polycrystalline powders of the non-oxide perovskite superconductor by using a sensitive tunnel-diode reson…
Disorder Induced Ferromagnetism in CaRuO3
T. He, R. J. Cava
The magnetic ground state of perovskite structure CaRuO3 has been enigmatic for decades. Here we show that paramagnetic CaRuO3 can be made ferromagnetic by very small amounts of pa…