Physics – Condensed Matter – Superconductivity
Scientific paper
2004-01-22
Phys. Rev. B 69, 014501 (2004)
Physics
Condensed Matter
Superconductivity
6 pages, 8 figures
Scientific paper
10.1103/PhysRevB.69.014501
We report a coexistence of superconductivity and antiferromagnetism in five-layered compound HgBa$_2$Ca$_4$Cu$_5$O$_y$ (Hg-1245) with $T_c=108$ K, which is composed of two types of CuO$_2$ planes in a unit cell; three inner planes (IP's) and two outer planes (OP's). The Cu-NMR study has revealed that the optimallydoped OP undergoes a superconducting (SC) transition at $T_c=108$ K, whereas the three underdoped IP's do an antiferromagnetic (AF) transition below $T_N\sim$ 60 K with the Cu moments of $\sim (0.3-0.4)\mu_B$. Thus bulk superconductivity with a high value of $T_c=108$ K and a static AF ordering at $T_N=60$ K are realized in the alternating AF and SC layers. The AF-spin polarization at the IP is found to induce the Cu moments of $\sim0.02\mu_B$ at the SC OP, which is the AF proximity effect into the SC OP.
Araki Yasufumi
Ihara Hideshi
Ito Katsushi
Iyo Akira
Kitaoka Yoshio
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