Surface Contribution to the Superconducting Properties of MgB2 Single Crystals
A. Rydh, U. Welp, J. M. Hiller, A. Koshelev, W. K. Kwok, G. W. Crabtree, K. H. P. Kim, C. U. Jung, H. -S. Lee, B. Kang, S. -I. Lee
Abstract
We demonstrate direct evidence of possible surface superconductivity on small, well-shaped MgB2 single crystals. Transport measurements in the range H < 1.6 Hc2c, where Hc2c is the bulk upper critical field for the c axis, show non-Ohmic and strongly angular dependent resistivity. Studies of the alignment of H with selected crystal surfaces, transport and specific heat measurements on the same crystal, and a physical sculpturing of the crystal surfaces using a focused ion beam all support the conclusion. Similar, albeit less pronounced results are obtained for fields in the basal plane.
Create a lesson
Related papers
The role of dependency range in thermally coupled superconducting networks
Nahala Yadid, Bnaya Gross, Shlomo Havlin et al.
Phonon-Mediated Superconductivity near Phase Boundaries in Rhombohedral Multilayer Graphene
Konstantinos Sourounis, Peter M. Oppeneer
Quantitative Impact of Occupation Smearing Methods on Conventional Superconductivity: from Electronic Structure through Lattice Dynamics to Electron-Phonon Coupling
Zhongyu Wan
Effects of the choice of the exchange-correlation functional on high-temperature superconductivity predictions in covalent-cage M(BN)5 family
Zhongyu Wan, Guo-Hua Zhong, Cheng-wei Ju et al.
Imaging atomic-scale surface structure and superconducting gap of the misfit layered compound (SnS)1.17NbS2
Dongming Zhao, Shamarita Deb, Lichen Ji et al.
Observation of stacked vortex structure with number controllable Majorana zero mode in Bi2Te3/FeTe heterojunction
Xinru Han, Zhaokun Luo, Quanxin Hu et al.