Nonmagnetic impurity effect on the Haldane gap system NiC2O4·2DMIz studied by high-field magnetization up to 40 T
✍ Scribed by H. Kikuchi; Y. Ajiro; N. Mori; H. Aruga Katori; T. Goto; H. Nagasawa
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 351 KB
- Volume
- 201
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
Nonmagnetic impurity effect on the high-field magnetization of the Haldane system is systematically studied at 1.7 K in a magnetic field up to 40 T for the new compound Nil-xZnxC204" 2DMIz (0 ~< x ~< 0.4), for the first time, in a wide concentration range. It was found that the magnetization curve is a sum of two distinct terms from the inner-and edge-spin contribution in finite chains. Bulk magnetization curves characteristic to the Haldane system still persist even in a Zn 20 at.% doped sample consistent with the theoretical result that the spin correlation length of the Haldane system is 5-6 atom lengths. Besides typical magnetization with finite energy gap, paramagnetic magnetization which comes from the edge-spins of S = 1 finite chains induced by nonmagnetic Zn 2 +ion substitution appears for all samples in the lower field. The total saturation magnetization of the paramagnetic moments increases with Zn concentration x, and its increase rate changes gradually at about x = 0.05-0.1. It is shown that these behaviors are consistent with the recent theoretical prediction based on a quantum Monte Carlo method.