2016/06/27 by Hidekazu Mukuda, Nozomu Shiki, Naoki Kimoto +4
Chemistry · Physics and Astronomy · #Antiferromagnetism #Atomic force microscopy #Cuprate #Doping #Inorganic Fluorides and Related Compounds #Magnetic moment #Physics of Superconductivity and Magnetism #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.7566/jpsj.85.083701
4 pages, 4 figures, Accepted for publication in J. Phys. Soc. Jpn
arxiv created 2016/06/27 · openalex publication_date 2016/07/11 · openalex created_date 2016/07/22 · arxiv updated 2016/08/03 · openalex updated_date 2026/08/05
We report 63Cu- and 205Tl-NMR studies on six-layered (n=6) high-Tc superconducting (SC) cuprate TlBa2Ca5Cu6O14+δ (Tl1256) with Tc∼100 K, which reveal that antiferromagnetic (AFM) order takes place below T\rm N∼170 K. In this compound, four underdoped inner CuO2 planes (n(IP)=4) sandwiched by two outer planes (OPs) are responsible for the onset of AFM order, whereas the nearly optimally-doped OPs responsible for the onset of bulk SC. It is pointed out that an increase in the out-of-plane magnetic interaction within an intra-unit-cell causes T\rm N∼ 45 K for Tl1245 with n(IP)=3 to increase to ∼170 K for Tl1256 with n(IP)=4. It is remarkable that the marked increase in T\rm N and the AFM moments for the IPs does not bring about any reduction in Tc, since Tc∼ 100 K is maintained for both compounds with nearly optimally doped OP. We highlight the fact that the SC order for n≥5 is mostly dominated by the long-range in-plane SC correlation even in the multilayered structure, which is insensitive to the magnitude of T\rm N and the AFM moments at the IPs or the AFM interaction among the IPs. These results demonstrate a novel interplay between the SC and AFM orders when the charge imbalance between the IPs and OP is significantly large.