Magnetic and superconducting phase diagrams in ErNi2B2C

Anisotropic thermal expansion and uniaxial pressure dependence of superconducting and magnetic transitions in ErNi2B2C

We present anisotropic thermal expansion measurements on single crystalline ErNi2B2C. All three, superconducting, antiferromagnetic and weak ferromagnetic phase transitions are unambiguously distinguished in the data. Anisotropic uniaxial pressure dependencies of the transitions are estimated based on the Ehrenfest relation, leading to a conclusion, in particular, that weak ferromagnetic state ...

Competition of multiband superconducting and magnetic order in ErNi2B2C observed by Andreev reflection

Point contacts (PC) Andreev reflection dV/dI spectra for the antiferromagnetic (TN ≃6K) superconductor (Tc ≃11K) ErNi2B2C have been measured for the two main crystallographic directions. Observed retention of the Andreev reflection minima in dV/dI up to Tc directly points to unusual superconducting order parameter (OP) vanishing at Tc. Temperature dependence of OP was obtained from dV/dI using ...

Neutron diffraction stud- ies of magnetic ordering in superconducting ErNi2B2C and TmNi2B2C in an ap- plied magnetic field

This thesis describes neutron diffraction studies of the long-range magnetic ordering of superconducting ErNi2B2C and TmNi2B2C in an applied magnetic field. The magnetic structures in an applied field are especially interesting because the field suppresses the superconducting order parameter and therefore the magnetic properties can be studied while varying the strength of superconductivity. Er...

Magnetic phase diagrams of the

On phase diagrams of magnetic reconnection

Recently, “phase diagrams” of magnetic reconnection were developed to graphically organize the present knowledge of what type, or phase, of reconnection is dominant in systems with given characteristic plasma parameters. Here, a number of considerations that require caution in using the diagrams are pointed out. First, two known properties of reconnection are omitted from the diagrams: the hist...