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Cu NMR/NQR Studies on Magnetism in Impurity/Hole-Doped Spin-Ladder Compounds |
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| Authors: | Shigeki Ohsugi Yoshio Kitaoka Masaki Azuma Yoshie Fujishiro Mikio Takano Takashi Nagata Hirokazu Fujino Jun Akimitsu |
| Institution: | (1) Department of Electrical Engineering and Electronics, College of Industrial Technology, Nishikoya 1-27–1, Amagasaki, Hyogo, 661-0047, Japan;(2) Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan;(3) Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611, Japan;(4) Department of Physics, Aoyama-Gakuin University, Chitosedai, Setagaya-ku, Tokyo, 157-8572, Japan |
| Abstract: | Cu nuclear magnetic resonance (NMR) spectra of impurities (Zn, Ni, and La)-doped spin-1/2 Heisenberg ladder compounds SrCu2O3 (Sr123) are broadened with Curie-like temperature (T) dependence. The spectra have been successfully fit by using a quasi-one-dimensional (Q1D) staggered polarization (SP) model. Such a SP has also revealed in Cu NMR measurements of Sr14–x Ca x Cu24O41 (Cax) with hole-doped ladders. The origin of possible 3D antiferromagnetic (AF) long-range ordering in (Zn and Ni)-doped Sr123 and Cax around x=12 at low T is considered to be similar. Once unpaired spins S 0's are induced and 3D interlayer interaction occurs, the localized spins couple in the whole system. |
| Keywords: | Cu NMR/NQR spin ladder magnetic ordering |
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