Coexistence of superconductivity and antiferromagnetism in multilayered high-Tc superconductor HgBa2Ca4Cu5Oy: Cu-NMR study
H. Kotegawa, Y. Tokunaga, Y. Araki, G.-q. Zheng, Y. Kitaoka, K. Tokiwa, K. Ito, T. Watanabe, A. Iyo, Y. Tanaka, H. Ihara
DOI 10.1103/PhysRevB.69.014501 · Physical Review B
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Abstract
We report a coexistence of superconductivity and antiferromagnetism in five-layered compound HgBa2Ca4Cu5Oy (Hg-1245) with Tc=108K, which is composed of two types of CuO2 planes in a unit cell; three inner planes (IP’s) and two outer planes (OP’s). The Cu-NMR study has revealed that the optimally doped OP undergoes a superconducting (SC) transition at Tc=108K, whereas the three underdoped IP’s do an antiferromagnetic (AF) transition below TN∼60K with the Cu moments of ∼(0.3–0.4)μB. Thus bulk superconductivity with a high value of Tc=108K and a static AF ordering at TN=60K are realized in the alternating AF and SC layers. The AF-spin polarization at the IP is found to induce the Cu moments of ∼0.02μB at the SC OP, which is the AF proximity effect into the SC OP.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2Ca4Cu5Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 108 | Pressure not reported | onset |
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