Bulk Superconductivity in Bi4O4S3Revealed by Specific Heat Measurement

Measurement of Specific Heat Functions by Differential Scanning Calorimetry

When a sample material is subjected to a linear temperature program, the heat flow rate into the sample i s proportional to its instantaneous specific heat. By recording this heat flow rate as a function of temperature, and comparing it with the heat flow rate into a standard material under the same conditions, the specific heat of the sample i s determined as a fundion of temperature. The meth...

Measurement of Specific Heat Capacity of Saltstone

Novel superconductivity: from bulk to nano systems

We begin with an introduction of superconductivity by giving a brief history of the phenomenon. The phenomenological Ginzburg–Landau theory and the microscopic theory of Bardeen, Cooper and Schrieffer are outlined. In view of recently available multi-band superconductors, relevant theories of both types are discussed. Unlike the traditional GL theory an extended GL theory is developed relevant ...

Multiband superconductivity in NbSe2 from heat transport

The thermal conductivity of the layered s-wave superconductor NbSe2 was measured down to Tc/100 throughout the vortex state. With increasing field, we identify two regimes: one with localized states at fields very near Hc1 and one with highly delocalized quasiparticle excitations at higher fields. The two associated length scales are most naturally explained as multi-band superconductivity, wit...

Measurement of the SOC State Specific Heat in 4 He

When a heat flux Q is applied downward through a sample of liquid He near the lambda transition, the helium self organizes such that the gradient in temperature matches the gravity induced gradient in 7\. All the helium in the sample is then at the same reduced temperature ^soc and the helium is said to be in the Self-Organized Critical (SOC) state. We have made preliminary measurements of the ...