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Full-Text Articles in Physics
Heavy-Fermion Superconductivity, Peter Riseborough, George Schmiedeshoff, James Smith
Heavy-Fermion Superconductivity, Peter Riseborough, George Schmiedeshoff, James Smith
George Schmiedeshoff
Heavy Fermion Superconductivity: A state of the art review of superconductivity in the Heavy Fermion metals is presented. Many important results are given. Theory and experiment are compared and critically discussed
Angular Dependent Magnetorestriction Study Of Cecoin5, Catalin Martin, Victor Correa, Kenneth Purcell, Timothy Timothy, Eric Palm, Stanley Tozer, George Schmiedeshoff, J Cooley
Angular Dependent Magnetorestriction Study Of Cecoin5, Catalin Martin, Victor Correa, Kenneth Purcell, Timothy Timothy, Eric Palm, Stanley Tozer, George Schmiedeshoff, J Cooley
George Schmiedeshoff
Using a capacitive dilatometer designed to operate on the rotating stage of a top loading dilution refrigerator probe, we measured the magnetorestriction ( L(H)-L(0))/L(0), of the Heavy Fermion Superconductor CeCoIn5, along all three crystallographic direction, and with the magnetic field applied parallel both to the superconducting ab-planes and to the c-axis. When B||ab, the c-axis magnetorestriction features, besides a sharp jump at the upper critical field, a continuous, second-order like, transition at a lower field, which is consistent with previous observations from specific heat measurements. Our results are consistent with a field induced modulation of the superconducting order parameter (FFLO …
High Magnetic Field Thermal-Expansion And Magnetostriction Of Uru2si2, Victor Correa, Timothy Murphy, Eric Palm, Stanley Tozer, Peter Sharma, Neil Harrison, Jamie Marcelo, George Schmiedeshoff, John Mydosh
High Magnetic Field Thermal-Expansion And Magnetostriction Of Uru2si2, Victor Correa, Timothy Murphy, Eric Palm, Stanley Tozer, Peter Sharma, Neil Harrison, Jamie Marcelo, George Schmiedeshoff, John Mydosh
George Schmiedeshoff
We present high magnetic field (up to 45 T) thermal-expansion and magnetostriction results on URu2Si2 single crystals. The volume change associated with the transition to the ``hidden'' order phase becomes increasingly discontinous as the magnetic field is raised above 30 T. This confirms recent thermal conductivity and specific heat experiments indicating a strong coupling between the ``hidden'' order parameter and the lattice which suggest some sort of charge ordered state. Several other transitions are observed at higher fields, many of them showing hysteresis, while a change in the sign of the magnetostriction coefficient is observed at the metamagnetic transition (BM …
Superconducting Critical Field Curves In Uranium-Niobium Alloys, Jason Cooley, W Hults, Jason Lashley, James Smith, George Schmiedeshoff
Superconducting Critical Field Curves In Uranium-Niobium Alloys, Jason Cooley, W Hults, Jason Lashley, James Smith, George Schmiedeshoff
George Schmiedeshoff
The uranium niobium binary alloy system exhibits a rich collection of phenomena for study. The composition range from 0 wt.% Nb to 10 wt.% Nb exhibits multiple crystallographic phases with interesting properties such as superconductivity, charge density waves and shape memory effects. We have extended the range of our resistivity measurements to as low as 400mK in order to map the critical field curves of these superconducting alloys. As a function of temperature some of the critical field curves have positive curvature which is somewhat correlated with the normal state temperature dependence of the resistivity. Work supported by the United …
Viscosity Measurements In Dilute Helium-3-Helium-4 Mixtures, George Schmiedeshoff
Viscosity Measurements In Dilute Helium-3-Helium-4 Mixtures, George Schmiedeshoff
George Schmiedeshoff
We have measured the viscosity of a dilute mixture of 3He in 4He at temperatures from 5 to 100 mK and in magnetic fields of 0.35, 2.01 and 8.76 T using a vibrating wire viscometer. Subject to our choice of calibration function, the data at 0.35 T is in good agreement with theory. Due to an interaction of our viscometer with the magnetic field the motion of the wire at 2.01 and 8.76 T is not understood; however, the 2.01 T data can be brought into agreement with the 0.35 T data by adjusting a geometrical constant. An increase in …