Contact pressure–aided spectroscopy

Point-contact Spectroscopy of Superconductors

Two-dimensional Two Contact Double Resonance Spectroscopy

A two-dimensional spectroscopic technique is presented. Application of the technique to determine all the relaxation rates for a multi-level quadrupole system is discussed along with experimental requirements. Theoretical and experimental data are analyzed for theN, three level, spin 1 system. The analysis shows that all three relaxation rates can be obtained from a single two-dimensional spect...

Point-contact Spectroscopy of Magnesium Diboride with Different Counter-electrodes

We report on tunneling and Andreev-reflection conductance spectra of 39 K superconducting magnesium diboride, obtained with Pb and Au counter-electrodes. Two distinct steps at close to 2.7 and 7.1 meV appear in a low-resistance metallic-type Au-MgB2 junction characteristic, whereas a tunneling-like spectrum measured for the same junction, annealed by the application of dc current, exhibits only...

Point-contact Spectroscopy of the Nickel Borocarbide Superconductors

An overview of the recent efforts in point-contact (PC) spectroscopy of the nickel borocarbide superconductors RNi2B2C in the normal and superconducting (SC) state is given. The results of measurements of the PC electronboson(phonon) interaction spectral function are presented. Phonon maxima and crystalline-electric-field (CEF) excitations are observed in the PC spectra of compounds with R=Dy, ...

Point-contact Spectroscopy on Rusr 2 Gdcu 2 O 8

We present Point-Contact experiments on polycrystalline RuSr2GdCu2O8 samples. The majority of tunneling curves shows a zero-bias conductance peak, which is modeled by assuming a d-wave pairing symmetry of the superconducting order parameter. The magnetic field dependence of the conductance spectra has been measured in very stable junctions. In some cases, due to the granularity of the samples, ...