Jin Xiao-Feng

Possible p-Wave Superconductivity in Epitaxial Bi/Ni Bilayers

Superconductivity (SC) is one of the most intriguing physical phenomena in nature. Nucleation of SC has long been considered highly unfavorable if not impossible near ferromagnetism, in low dimensionality and, above all, out of non-superconductor. Here we report observation of SC with TC near 4K in Ni/Bi bilayers that defies all known paradigms of superconductivity, where neither ferromagnetic Ni film nor rhombohedra Bi film is superconducting in isolation. This highly unusual SC is independent of the growth order (Ni/Bi or Bi/Ni), but highly sensitive to the constituent layer thicknesses. Most importantly, the SC, distinctively non-s pairing, is triggered from, but does not occur at, the Bi/Ni interface. Using point contact Andreev reflection, we show evidences that the unique SC, naturally compatible with magnetism, is triplet p-wave pairing.

The elimination of in islands on InP surfaces and ITS mechanism

The surface indium islands originated by argon ion bombardment can be removed by evaporating phosphorous on InP surface followed by annealing. A possible mechanism of elimination of In islands is proposed based on the experimental ELS and XPS data.

Towards a Better Understanding of the Anomalous Hall Effect

Recent experimental efforts to identify the intrinsic and extrinsic contributions in the anomalous Hall effect are reviewed. Benefited from the experimental control of artificial impurity density in single crystalline magnetic thin films, a comprehensive physical picture of the anomalous Hall effect involving multiple competing scattering processes has been established. Some new insights into the microscopic mechanisms of the anomalous Hall effect are discussed.

GROWTH AND INTERFACE STRUCTURE OF MN ON INP (001)

An attempt to grow single crystalline thin films of body-centered-cubic (bcc) Mn on InP (001) has been carried out by molecular beam epitaxy. In situ reflection high energy electron diffraction and ex situ x-ray diffraction are used to characterize the film and interface structures. It is found that the metastable phase of bcc Mn fails to stabilize on the substrate despite of their perfect lattice-match. This result suggests again the importance of interface structure in the epitaxy of 3d metals on semiconductors.

THE THERMAL DESORPTION SPECTRA STUDY OF HYDROGEN CHEMISORPTION ON Si(100) CLEAN SURFACE

Two desorption peaks corresponding to monohydride and dihydride phases on Si(100) surface have been found in the thermal desorption measurement. The experimental activation energies of desorption for these two peaks are 53 kcal/mole and 15 kcal/mole respectively, which are quite close to the calculated desorption energies reported by Verwoerd. This implies that both the monohydride and dihydride phases are desorbed in the form of molecules. But the order plot shows that the desorption kinetics of monohydride phase is a first order process.