J. Phys. Soc. Jpn. 86, 104713 (2017) [3 Pages]

Magnetization Process of the S = 1/2 Two-Leg Organic Spin-Ladder Compound BIP-BNO

+ Affiliations
1Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan2Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan3Department of Physical Science, Osaka Prefecture University, Sakai 599-8531, Japan4Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan5Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, U.S.A.

We have measured the magnetization of the organic compound BIP-BNO [3,5′-bis(N-tert-butylaminoxyl)-3′,5-dibromobiphenyl] up to 76 T, at which the magnetization is saturated. The S = 1/2 antiferromagnetic Heisenberg (AFH) two-leg spin-ladder model accounts for the magnetization curve, which is well reproduced by quantum Monte Carlo calculations. The exchange constants on the rung and leg of the ladder are evaluated as Jrung/kB = 65.7 K and Jleg/kB = 14.1 K, respectively, which is in the strong coupling region of Jrung/Jleg > 1. The results provide strong evidence that BIP-BNO is an S = 1/2 AFH two-leg spin ladder.

©2017 The Physical Society of Japan


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