Atomic resolution and vortex lattice studies of magnetic superconductors: A first approach in the nickel borocarbide TmNi2B2C

作者：Guillamon I; Crespo M; Suderow H^*; Vieira S; Brison J P; Bud'ko S L; Canfield P C

来源：Physica C-Superconductivity and Its Applications, 2010, 470(19): 771-775.

DOI：10.1016/j.physc.2010.02.073

• Magnetism and superconductivity
• Scanning tunneling microscopy and spectroscopy
• Vortex lattice
• Nickel borocarbides

We present new scanning tunneling microscopy measurements in the superconductor TmNi2B2C. The topography shows in some areas flat surfaces, where atomic size modulations can be identified. We find a hexagonal vortex lattice between 0.15 T and 1.4T, when the magnetic field is applied along the basal plane of the tetragonal crystal structure (B perpendicular to c), and a hexagonal to square transition around 0.15 T when the field is applied along the c-axis (B parallel to c). Measured intervortex distance are smaller than expected at high field, due to the internal field being larger than the applied field.

• 出版日期2010-10-1
• 单位中国地震局