[en] Magnetization, specific heat, and electrical resistivity measurements were made on single crystals of the filled skutterudite compound PrOs₄As₁₂. Specific heat measurements indicate an electronic specific heat coefficient γ ∼ 50-200 mJ/mol K² at temperatures 10 K (le) T (le) 18 K, and ∼ 1 J/mol K² for t (le) 1.6 K. Magnetization, specific heat, and electrical resistivity measurements reveal the presence of two, or possibly three, ordered phases at temperatures below ∼ 2.3 K and in fields below ∼ 3 T. The low temperature phase displays antiferromagnetic characteristics, while the nature of the ordering in the other phase(s) has yet to be determined

No abstract available

[en] The low-temperature specific heat csub(p) of single-crystalline samples of USb and UTe have been measured between 0.1 and 12 K. From the experimental data values are deduced for the electronic specific-heat parameter γ of 0.2 mJ/mole K² and 10.3 mJ/mole K² for USb and UTe, respectively. csub(p) data below 1 K reveal the onset of nuclear specific heat with decreasing temperature. In our temperature range, this contribution is much stronger for USb than for UTe. (author)

[en] A new method for measuring heat capacities of small samples (approximately equal to mg) at low temperatures (2-10 K) using an AC heating has been described. The incoming pulse has a special time dependence and under some circumstances gives a linear response. It is possible (on the basis of this linear response) to calculate the sample heat capacity from two independent results of the solution of the analogeous differential equation

[en] We study the heat capacity C_s and the superfluid density ρ_s for the various possible order parameters in Sr₂RuO₄. We focus on the question of how the different nodal structures of the gap can be distinguished by the temperature dependences of the heat capacity and the superfluid density. The order parameters are classified into several different types, depending on the low temperature behavior of C_s and ρ_s. We also derive the general expressions for the various physical quantities while taking into account the effect of impurity scattering. Impurity scattering in the unitarity limit can have a profound effect on the physical quantities at zero temperature

No abstract available

No abstract available

[en] The heat capacity of technetium has been measured in zero field between 3 and 15 K. A superconducting transition temperature T/subc/ = 7.86 K is found. The electronic heat-capacity coefficient and zero-degree Debye temperature are 4.30 mJ/mole K² and 454 K, respectively. An electron-phonon enhancement factor of 0.65 is found from the McMillan equation. The thermodynamic properties of the superconducting state also indicate that technetium is an intermediate-coupling superconductor

[en] We have measured the field-dependent heat capacity in the tetragonal antiferromagnets CeRhIn₅ and Ce₂RhIn₈, both of which have an enhanced value of the electronic specific heat coefficient γ∼400 mJ/mol Ce K² above T_N. For T< T_N, the specific heat data at zero applied magnetic field are consistent with the existence of an anisotropic spin-density wave opening a gap in the Fermi surface for CeRhIn₅, while Ce₂RhIn₈ shows behavior consistent with a simple antiferromagnetic magnon. From these results, the magnetic structure, in a manner similar to the crystal structure, appears more two dimensional in CeRhIn₅ than in Ce₂RhIn₈ where only about 12% of the Fermi surface remains ungapped relative to 92% for Ce₂RhIn₈. When B||c, both compounds behave in a manner expected for heavy-fermion systems as both T_N and the electronic heat capacity decrease as field is applied. When the field is applied in the tetragonal basal plane (B||a), CeRhIn₅ and Ce₂RhIn₈ have very similar phase diagrams which contain both first- and second-order field-induced magnetic transitions

[en] Specific heat is the rate of change of the energy of a system with temperature. The principles of adiabatic and relaxation calorimetry are discussed briefly. In a superconductor the vibrations of the lattice and the free electrons contribute to the specific heat. The electronic contribution has a different temperature dependence in the normal and the superconducting states. At the superconducting transition there is a jump in the specific heat. After a short description of the different contributions, the principles of adiabatic and relaxation calorimetry are discussed briefly. Some examples are presented from studies on low temperature superconductors to illustrate the information that can be obtained from an analysis of the specific heat data. Some important features of the specific heat of high temperature superconductors are touched upon. (author)