Aligned crystallite powder ofNdFeAsO0.86F0.14: Magnetic hysteresis and penetration depth

Aligned crystallite powder of NdFeAsO0.86F0.14: Magnetic hysteresis and penetration depth

Yuri L. Zuev,1 Eliot D. Specht,1 Claudia Cantoni,1 David K. Christen,1 James R. Thompson,1,2 Rongying Jin,1 Athena S. Sefat,1 David G. Mandrus,1 Michael A. McGuire,1 and Brian C. Sales1 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 2Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200, USA Received 1 May 200...

Magnetic Penetration Depth Measurements in Cuprate Superconductors

We examine recent results on measurements of the magnetic penetration depth in cuprate superconductors, with particular emphasis on our results obtained with the microstrip and parallel-plate resonator techniques. The results show that the magnetic penetration depth temperature dependence in YBa2Cu307-a is not consistent with a simple scaled weak-coupled BCS temperature dependence. We present t...

Magnetic Nerve Stimulation: Field Focality and Depth of Penetration

Critical fluctuations in superconductors and the magnetic field penetration depth.

The superconducting transition is studied within the one-loop RG in fixed dimension D = 3 and at the critical point. A tricritical behavior is found and, for κ > κc, an attractive charged fixed point, distinct from that of a neutral superfluid. The critical exponents of the continuous transition are evaluated and it is shown that the anomalous dimension of the gauge-field equals unity. This imp...

Surface aligned magnetic moments and hysteresis of an endohedral single-molecule magnet on a metal.

The interaction between the endohedral unit in the single-molecule magnet Dy_{2}ScN@C_{80} and a rhodium (111) substrate leads to alignment of the Dy 4f orbitals. The resulting orientation of the Dy_{2}ScN plane parallel to the surface is inferred from comparison of the angular anisotropy of x-ray absorption spectra and multiplet calculations in the corresponding ligand field. The x-ray magneti...