NMR evidence for localized spins on Cu(2) sites from Cu NMR in YBa 2 Cu 3 O 7 and YBa 2 Cu 3 O 6.75 single crystals
作者： M. Horvatić , P. Ségransan , C. Berthier , Y. Berthier , P. Butaud
关键词:
摘要: We report /sup 63,65/Cu NMR spectra and nuclear spin-lattice relaxation data for YBa/sub 2/Cu/sub 3/O/sub 7/(T/sub c/ = 91 K) 6.75/(T/sub 5/sub 7/ single crystals between 45 300 K. An analysis of the rates gives evidence localized electronic spins on planar Cu(2) sites. In 6.75/ both fourfold twofold oxygen-coordinated Cu(1) are observed; latter experience same quadrupolar coupling (..nu../sub Q/approx. =31.5 MHz) as sites but a nearly zero magnetic hyperfine shift much slower rate (d/sup 10/ configuration).
harvard.edu
sci-hub.se 参考文章(23)
M. K. Wu, J. R. Ashburn, C. J. Torng, P. H. Hor, R. L. Meng, L. Gao, Z. J. Huang, Y. Q. Wang, C. W. Chu, Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure Physical Review Letters. ,vol. 58, pp. 908- 910 ,(1987) , 10.1103/PHYSREVLETT.58.908
M Mali, D Brinkmann, L Pauli, J Roos, H Zimmermann, J Hulliger, Cu and Y NQR and NMR in the superconductor YBa2Cu3O7−δ Physics Letters A. ,vol. 124, pp. 112- 116 ,(1987) , 10.1016/0375-9601(87)90384-7
W. W. Warren, R. E. Walstedt, G. F. Brennert, G. P. Espinosa, J. P. Remeika, Evidence for two pairing energies from nuclear spin-lattice relaxation in superconducting Ba2YCu3O7- delta. Physical Review Letters. ,vol. 59, pp. 1860- 1863 ,(1987) , 10.1103/PHYSREVLETT.59.1860
Yoshio Kitaoka, Shigeru Hiramatsu, Takayuki Kondo, Kunisuke Asayama, Nuclear Relaxation and Knight Shift Studies of Copper in YBa2Cu3O7-y Journal of the Physical Society of Japan. ,vol. 57, pp. 30- 33 ,(1988) , 10.1143/JPSJ.57.30
Toshiro Takabatake, Yasuhiro Nakazawa, Masayasu Ishikawa, Takashi Imai, Tadashi Shimizu, Toshinobu Tsuda, Hiroshi Yasuoka, Nuclear Spin-Lattice Relaxation of 63,65Cu at the Cu(2) Sites of the High Tc Superconductor YBa2Cu3O7-δ Journal of the Physical Society of Japan. ,vol. 57, pp. 1771- 1779 ,(1988) , 10.1143/JPSJ.57.1771
C. H. Pennington, D. J. Durand, D. B. Zax, C. P. Slichter, J. P. Rice, D. M. Ginsberg, Cu nuclear magnetic resonance of aligned single crystals of YBa2Cu3O7- delta. Physical Review B. ,vol. 37, pp. 7944- 7947 ,(1988) , 10.1103/PHYSREVB.37.7944
P. C. Hammel, M. Takigawa, R. H. Heffner, Z. Fisk, Copper nuclear quadrupole resonance in GdBa2Cu3O7: Determination of site assignment Physical Review B. ,vol. 38, pp. 2832- 2835 ,(1988) , 10.1103/PHYSREVB.38.2832
Yoh Kohori, Hirofumi Shibai, Yasukage Oda, Takao Kohara, Yoshio Kitaoka, Kunisuke Asayama, NQR Study of Copper in SmBa2Cu3O7-y Journal of the Physical Society of Japan. ,vol. 57, pp. 744- 746 ,(1988) , 10.1143/JPSJ.57.744
Yoh Kohori, Hirofumi Shibai, Yasukage Oda, Yoshio Kitaoka, Takao Kohara, Kunisuke Asayama, Site Assignment for Copper NQR Lines in YBa2Cu3O7-y Journal of the Physical Society of Japan. ,vol. 57, pp. 1568- 1571 ,(1988) , 10.1143/JPSJ.57.1568
J. M. Tranquada, D. E. Cox, W. Kunnmann, H. Moudden, G. Shirane, M. Suenaga, P. Zolliker, D. Vaknin, S. K. Sinha, M. S. Alvarez, A. J. Jacobson, D. C. Johnston, Neutron-diffraction determination of antiferromagnetic structure of Cu ions in YBa2Cu Physical Review Letters. ,vol. 60, pp. 156- 159 ,(1988) , 10.1103/PHYSREVLETT.60.156