2001/02/28 by Wen Hai‐Hu, H. H. Wen, S. L. Li +15 · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1088/0256-307x/18/6/335
published as Chin. Phys. Lett. 18, 816(2001) · 4 pages, 4 figures
arxiv created 2001/03/11 · openalex publication_date 2001/05/03 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
By using transport and magnetic measurements, the upper critical field H c2 ( T ) and the irreversibility line H irr ( T ) have been determined. A large separation between H c2 (0) and H irr (0) has been found showing the existence of a quantum vortex liquid state induced by quantum fluctuation of vortices in the new superconductor MgB 2 . Further investigation of the magnetic relaxation shows that both the quantum tunnelling and the thermally activated flux creep depend weakly on temperature. However, when the melting field H irr is approached, a drastic rise of the relaxation rate is observed. This may indicate that the melting of the vortex matter at a finite temperature is also induced by the quantum fluctuation of vortices.