Ch. Marcenat

The magnetic instability in the heavy fermion compounds Ce1?x La x Ru2Si2

The magnetization and the specific heat of Ce1−xLaxRu2Si2 with x≤0.13 are reported with special attention to the effect of magnetic field and the role of lanthanum doping. Evidence is given of differences between the undoped (x=0) and the solid solution (x≠0) cases. A common feature is the occurrence of well-defined anomalies in the magnetization at the “metamagnetic” fieldHM independently of whether the ground state is one of long-range order or Pauli paramagnetism. Forx=0, the ground state appears to be a Pauli paramagnet for any strength of the magnetic field; quantum fluctuations or deviations from an ideal lattice may prevent the occurrence of a true static magnetic transition.

Superconducting transition and phase diagram of single-crystal MgB2

The superconducting phase diagram of

Superconducting phase diagram of single-crystal MgB2

{\mathrm{MgB}}_{2}

SPECIFIC HEAT OF YBA2CU3O7-DELTA AND (LA2-XSRX)CUO4 : EVIDENCE FOR D-WAVEPAIRING

was determined from magnetization, magnetotransport, and single-crystal specific-heat measurements. A zero-temperature in-plane coherence length of 9.4 nm is determined. The superconducting anisotropy \ensuremath{\gamma} increases from a value around 2 near

Phase Diagram of Single Crystal MgB2

{T}_{c}

Field dependence of the specific heat of single-crystal HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}}

to above 4.5 at 22 K. For

Field Dependence of the Specific Heat of Single-Crystal HgBa 2 Ca 2 Cu 3 O 8 + δ

H\ensuremath{\parallel}c

Field dependence of the specific heat of single-crystalHgBa2Ca2Cu3O8+δ

a pronounced peak effect in the critical current occurs at the upper critical field. Evidence for a surface superconducting state is presented for

Electronic specific heat of Nd2−xCexCuO4−δ

H\ensuremath{\parallel}c

Evidence for line nodes in the energy gap for (La{sub 1.85}Sr{sub 0.15})CuO{sub 4} from low-temperature specific-heat measurements

that might account for the widespread in reported values of \ensuremath{\gamma}.