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H-T phase diagram of the metamagnetic transition in , measured in high d. c. magnetic fields
A. Suslov, J. B. Ketterson, D. G. Hinks +1
We have studied the ultrasonic velocity and ac susceptibility of in d. c. magnetic fields up to 45T. A significant difference between the constructed H-T phase diagram…
Dependence of the superconducting transition temperature of single- and polycrystalline MgB2 on hydrostatic pressure
S. Deemyad, T. Tomita, J. J. Hamlin +6
The dependence of Tc for MgB2 on purely hydrostatic or nearly hydrostatic pressure has been determined to 23 GPa for single-crystalline and to 32 GPa for polycrystalline samples, a…
Break-Junction Tunneling on MgB_2
H. Schmidt, J. F. Zasadzinski, K. E. Gray +1
Tunneling data on magnesium diboride, MgB_2, are reviewed with a particular focus on superconductor-insulator-superconductor (SIS) junctions formed by a break-junction method. The…
Synthesis and Stoichiometry of MgB2
D. G. Hinks, J. D. Jorgensen, Hong Zheng +1
The system MgxB2 has been investigated to investigate possible nonstoichiometry in MgB2. When synthesized at 850oC, MgB2 is a line compound with a possible Mg vacancy content of ab…
Large Anisotropic Thermal Expansion Anomaly near the Superconducting Transition Temperature in MgB2
J. D. Jorgensen, D. G. Hinks, P. G. Radaelli +2
An anisotropic lattice anomaly near the superconducting transition temperature, Tc, was observed in MgB2 by high-resolution neutron powder diffraction. The a-axis thermal expansion…
Two-Band Superconductivity in MgB2
M. Iavarone, G. Karapetrov, A. E. Koshelev +3
The study of the anisotropic superconductor MgB2 using a combination of scanning tunneling microscopy and spectroscopy reveals two distinct energy gaps at Delta1=2.3 meV and Delta2…