Formation of magnetic moments in the cuprate superconductor Hg0.8Cu0.2Ba2Ca2Cu3O8+δ below Tc seen by NQR

作者: H. Breitzke , I. Eremin , D. Manske , E.V. Antipov , K. Lüders

DOI: 10.1016/J.PHYSC.2004.02.183

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摘要: We report pure zero field nuclear magnetic resonance (NQR) measurements on the optimally doped three layer highTc-compounds HgBaCaCuO and HgBaCaCuO(F) with Tc ¼ 134 K. Above two Cu NQRline pairs are observed in spectra corresponding to inequivalent lattice sites. Below NQRspectra show additional lines leading extreme broadened at 4.2 K well known for compounds. The spin– relaxation curves follow a triple exponential function coefficients depend onto saturation time (number of pulses), whereas spin–spin curve is described by single function. From spin–lattice we deduced complete removal Kramers degeneracy quadrupole levels indicating that due Zeemann splitting 63=65 spontaneous formation moments within CuO layers. 140 K, fitted number 6 line pairs. lines, position relative each other an orientation parallel c-axis magnitudes order 1000 G. also discuss possible microscopic origin internal fields. 2004 Elsevier B.V. All rights reserved.

参考文章(31)
E R Andrew, D P Tunstall, Spin-Lattice Relaxation in Imperfect Cubic Crystals and in Non-cubic Crystals Proceedings of the Physical Society. ,vol. 78, pp. 1- 11 ,(1961) , 10.1088/0370-1328/78/1/302
M. Eremin, A. Rigamonti, Spin-freezing mechanism in underdoped superconducting cuprates. Physical Review Letters. ,vol. 88, pp. 037002- ,(2002) , 10.1103/PHYSREVLETT.88.037002
J. Brad Marston, Ian Affleck, Large- n limit of the Hubbard-Heisenberg model Physical Review B. ,vol. 39, pp. 11538- 11558 ,(1989) , 10.1103/PHYSREVB.39.11538
A. Kaminski, A. Kaminski, H. Raffy, S. Rosenkranz, S. Rosenkranz, W. G. Cullen, C. M. Varma, C. G. Olson, J. C. Campuzano, J. C. Campuzano, H. You, Z. Li, H. M. Fretwell, H. Höchst, Spontaneous breaking of time-reversal symmetry in the pseudogap state of a high-Tc superconductor. Nature. ,vol. 416, pp. 610- 613 ,(2002) , 10.1038/416610A
Albert Narath, Nuclear Spin-Lattice Relaxation in Hexagonal Transition Metals: Titanium Physical Review. ,vol. 162, pp. 320- 332 ,(1967) , 10.1103/PHYSREV.162.320
K. Fujiwara, Y. Kitaoka, K. Ishida, K. Asayama, Y. Shimakawa, T. Manako, Y. Kubo, NMR and NQR studies of superconductivity in heavily doped Tl2Ba2CuO6+y with a single CuO2 plane Physica C: Superconductivity. ,vol. 184, pp. 207- 219 ,(1991) , 10.1016/0921-4534(91)90385-C
Robert G. Griffin, C. P. Slichter, Principles of magnetic resonance ,(1963)
Kenji Fujiwara, Yoshio Kitaoka, Kunisuke Asayama, Hiroyuki Sasakura, Sinnosuke Minamigawa, Kiyotaka Nakahigashi, Shigemitsu Nakanishi, Mineo Kogachi, Nobuo Fukuoka, Akira Yanase, Nuclear Quadrupole Resonance of Cu in High-TcBi–Pb–Sr–Ca–Cu–O Journal of the Physical Society of Japan. ,vol. 58, pp. 380- 382 ,(1989) , 10.1143/JPSJ.58.380
I.E. Lipinski, A.V. Zalessky, A.P. Levanyuk, G.S. Mironova, E.M. Smirnovskaya, A.A. Bush, 63Cu and 65Cu NQR lineshape in Bi-Sr-Ca-Cu-O high-Tc superconductors Physica C: Superconductivity. ,vol. 168, pp. 291- 296 ,(1990) , 10.1016/0921-4534(90)90520-O
T. Oashi, K. Kumagai, H. Nakajima, M. Kikuchi, Y. Syono, Nuclear quadrupole resonance of 6365Cu in the 2223 phase of Tl-Ba-Ca-Cu-O and (Bi, Pb)-Sr-Ca-Cu-O Physica C: Superconductivity. ,vol. 161, pp. 367- 372 ,(1989) , 10.1016/0921-4534(89)90349-3