Gigantic Anisotropic Uniaxial Pressure Effect on Superconductivity within the CuO_2 Plane of La_<1.64>Eu_<0.2>Sr_<0.16>CuO_4 : Strain Control of Stripe Criticality (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

論文の詳細を見る
The effect of uniaxial pressure on superconductivity was examined for high-T_c cuprate La_<1.64>Eu_<0.2>- Sr_<0.16>CuO_4, which is located at the boundary between the superconducting and stripe phases. We found markedly large anisotropy of the uniaxial pressure effect not only between the in-plane and out-of-plane pressures but also within the tetragonal CuO_2 plane. When the pressure is applied along the [110] direction, we found the largest pressure effect ever observed in cuprates, dT_c/dP_<[110]> 〜 2.5 K/kbar, while the change in T_c was not appreciable when the pressure is applied along [100]. This substantial in-plane anisotropy is attributed to an intimate link between the symmetry of one-dimensional stripes and that of the strain produced within the CuO_2 plane.
社団法人日本物理学会の論文
2004-05-15