Title :
Magnetic properties of GdBa2Cu3O7 crystals in high magnetic field
Author :
Guillot, M. ; Tholence, J.-L. ; Marchand, A. ; Potel, M. ; Gougeon, P. ; Noel, H. ; Levet, J.C.
Author_Institution :
Service Nat. des Champs Intenses, CNRS, Grenoble, France
fDate :
9/1/1989 12:00:00 AM
Abstract :
The magnetic properties of single crystals of GdBa2Cu 3O7 were investigated in a magnetic field of up to 20 T applied parallel to the c axis in the 1.7-300 K temperature range. In the superconducting state, the field and temperature dependences of the critical current densities were deduced from the hysteresis of the half-cycle using Bean´s critical state model. The Gd3+ paramagnetic moment was then studied. Above about 20 K, the M(H) isotherms were found to be given, at different temperatures, by the Brillouin function of the free Gd3+ ion. Below 20 K, the average magnetization does not obey the Brillouin law. The normal-state susceptibility was described by the free-ion Curie-Weiss law
Keywords :
barium compounds; critical current density (superconductivity); gadolinium compounds; high-temperature superconductors; magnetic susceptibility; magnetisation; 1.7 to 300 K; 20 T; Bean´s critical state model; Brillouin function; Gd3+ paramagnetic moment; GdBa2Cu3O7; M(H) isotherms; average magnetization; critical current densities; field dependence; free Gd3+ ion; free-ion Curie-Weiss law; high magnetic field; high temperature superconductors; hysteresis; magnetic properties; normal-state susceptibility; single crystals; superconducting state; temperature dependences; Anisotropic magnetoresistance; Crystallization; Crystals; Magnetic field measurement; Magnetic fields; Magnetic hysteresis; Magnetic properties; Magnetization; Superconductivity; Temperature distribution;
Journal_Title :
Magnetics, IEEE Transactions on
