Novel Interplay between High-T-c Superconductivity and Antiferromagnetism in Tl-Based Six-CuO2-Layered Cuprates: Tl-205- and Cu-63-NMR Probes

作者：Mukuda Hidekazu^*; Shiki Nozomu; Kimoto Naoki; Yashima Mitsuharu; Kitaoka Yoshio; Tokiwa Kazuyasu; Iyo Akira

来源：Journal of the Physical Society of Japan, 2016, 85(8): 083701.

DOI：10.7566/JPSJ.85.083701

We report Cu-63- and Tl-205-NMR studies on six-layered (n = 6) high-T-c superconducting (SC) cuprate TlBa2Ca5-Cu6O14+delta (Tl1256) with T-c similar to 100 K, which reveal that antiferromagnetic (AFM) order takes place below T-N similar to 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-N similar to 45K for Tl1245 with n(IP) = 3 to increase to similar to 170K for Tl1256 with n(IP) = 4. It is remarkable that the marked increase in TN and the AFM moments for the IPs does not bring about any reduction in T-c, since T-c similar to 100K 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-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.

• 出版日期2016-8-15