Uniform Mixing of High-Tc Superconductivity and Antiferromagnetism on a Single CuO2 Plane of a Hg-Based Five-Layered Cuprate

Abstract

We report a site selective Cu-NMR study on underdoped Hg-based five-layered high-Tc cuprate HgBa2Ca4Cu5O12+δ with a Tc=72 K. Antiferromagnetism (AFM) has been found to take place at TN=290 K, exhibiting a large antiferromagnetic moment of 0.67–0.69μB at three inner planes (IP). This value is comparable to the values reported for nondoped cuprates, suggesting that the IP may be in a nearly nondoped regime. Most surprisingly, the AFM order is also detected with MAFM(OP)=0.1μB even at two outer planes (OP) that are responsible for the onset of superconductivity (SC). The high-Tc SC at Tc=72 K can uniformly coexist on a microscopic level with the AFM at OP’s. This is the first microscopic evidence for the uniform mixed phase of AFM and SC on a single CuO2 plane in a simple environment without any vortex lattice and/or stripe order.

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