Metastable Vortex Lattice Phases in Superconducting MgB2
| Autor: | Das, P., Rastovski, C., O'Brien, T. R., Schlesinger, K. J., Dewhurst, C. D., DeBeer-Schmitt, L., Zhigadlo, N. D., Karpinski, J., Eskildsen, M. R. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 108, 167001 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.108.167001 |
| Popis: | The vortex lattice (VL) symmetry and orientation in clean type-II superconductors depends sensitively on the host material anisotropy, vortex density and temperature, frequently leading to rich phase diagrams. Typically, a well-ordered VL is taken to imply a ground state configuration for the vortex-vortex interaction. Using neutron scattering we studied the VL in MgB2 for a number of field-temperature histories, discovering an unprecedented degree of metastability in connection with a known, second-order rotation transition. This allows, for the first time, structural studies of a well-ordered, non-equilibrium VL. While the mechanism responsible for the longevity of the metastable states is not resolved, we speculate it is due to a jamming of VL domains, preventing a rotation to the ground state orientation. Comment: Main paper: 5 pages, 4 figures. Supplementary material: 3 pages, 7 figures |
| Databáze: | arXiv |
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