作者: H. Breitzke , I. Eremin , D. Manske , E.V. Antipov , K. Lüders
DOI: 10.1016/J.PHYSC.2004.02.183
关键词:
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.