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Article
An unusual phase transition to a second liquid vortex phase in the superconductor YBa2Cu3O7
A magnetic field penetrates a superconductor through an array of ‘vortices’, each of which carries one quantum of flux that is surrounded by a circulating supercurrent. In this vortex state, the resistivity is...
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Article
Calorimetric Study of CeRu2Ge2 Under Continuously Swept Hydrostatic Pressure up to 8 GPa
We have implemented AC calorimetric measurements in diamond anvil pressure cells. The range of pressure (0–20 GPa), the excellent hydrostatic conditions of solid 4He used as the pressure transmitting medium assoc...
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Article
Detection of doubled shot noise in short normal-metal/ superconductor junctions
Shot noise refers to the fluctuations in electrical current through a device arising from the discrete nature of the charge-carrying particles. Recent experiments have exploited the fact that the shot noise is...
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Article
Collapse of the magnetic ordering and structural anomalies in the U La S system: neutron diffraction and specific heat measurements
We report specific heat and neutron diffraction measurements of seven samples in the solid solution system UxLa1-xS. All samples have the simple fcc NaCl crystal structure. Both specific heat and neutron diffract...
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Article
Specific Heat of YBa2Cu3O7−−δ and (La2−xSrx)CuO4: Evidence for d-Wave Pairing
New low-temperature specific-heat data for YBa2Cu3O7−δ, 0≤δ≤0.2, and (La1.85Sr0.15)CuO4 in magnetic fields (H) to 9 T are reported. They show features predicted for the lines of nodes in the energy gap that are e...
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Article
Thermodynamic properties of the spin-1/2 antiferromagnetic ladder under magnetic field
Specific heat (CV) measurements in the spin-1/2 Cu2(C2H12N2)2Cl4 system under a magnetic field up to H =8.25 T are reported and compared to the results of numerical calculations based on the 2-leg antiferromagnet...
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Article
Step Structure Observed in the Superconducting Transition of a Bulk Pb Wire with Very Low Current Densities
We have developed a SQUID picovoltmeter and precise temperature control ( ∼μK) to measure sharp R(T) superconducting transitions of low impedance samples, with low current densities. We present m...
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Article
Magnetic order in La1−δMnO3
The magnetic properties of La1−δMnO3 depend on the relative concentration of Mn+4/Mn+3 introduced by vacancies on La sites. Neutron diffraction, magnetization, AC susceptibility and heat capacity measurements hav...
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Chapter and Conference Paper
Thermal Properties of Silica Gels
Silica aerogels are very exceptional materials in the huge panoply of solids: densities as low as 0.1 times that of amorphous silica can be obtained. In such systems, the distribution of matter is highly inhom...
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Chapter and Conference Paper
Thermal Properties of Cordierite Glass
The particular features of the thermal properties of noncrystalline solids in the temperature range 2 – 10 K (“plateau” in thermal conductivity K(T) and excess in specific heat c(T)) have tentatively been attr...
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Article
Controlled nucleation and quasi-ordered growth of ice crystals from low temperature electrolyte solutions
The process by which ice forms during the cooling of water and aqueous solutions has been studied intensively mostly in conditions where the nucleation occurs heterogeneously—on some particulate impurity surfa...
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Chapter
Phonon Density of States and Specific Heat of Amorphous and Crystalline Selenium
In the harmonic approximation, the thermodynamic functions are related to the phonon density of states g(w) (PDS) by a linear integral equation. In particular, for the specific heat C(T) the equation is: ...
