1997/10/07 by H. Mayaffre, P. Auban-Senzier, Pascale Auban‐Senzier +9 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Iron-based superconductors research #Physics of Superconductivity and Magnetism #cond-mat
paper · pdf · doi:10.1126/science.279.5349.345
6 pages, latex, 4 postscript figures included, submitted to Science
arxiv created 1997/10/07 · openalex publication_date 1998/01/16 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
Transport and copper-63 nuclear magnetic resonance measurements of the Knight shift and relaxation time T 1 performed on the two-leg spin ladders of Sr 2 Ca 12 Cu 24 O 41 single crystals as a function of pressure show a collapse of the gap in ladder spin excitations when superconductivity is stabilized at 31 kilobars. This result suggests that the superconducting phase in these materials may be connected to this transition and the collapse of the spin gap, and support the prediction made with exact diagonalization techniques in two-leg isotropic t − J ladder models of a transition between a low-doping spin gap phase and a gapless regime.