Spin-lattice separation of the spin-ladder compound BIP-TENO by microsecond megagauss field

We have conducted magnetization measurements of the S = 1 spin-ladder compound BIP-TENO using the single-turn coil method which generates micro-second pulsed magnetic field. We observed three magnetization plateaus in the magnetization process up to 100 T. We have also found that the magnetization process depends on the sweep speed of the magnetic fields. Possible origins of this phenomenon are (1) lowering temperature of the samples due to magnetocaloric effect with adiabatic condition realized in the fast (micro-second) pulsed magnetic field, and (2) spin-lattice separation due to a slow response of the magnetostriction whose response time is longer than microsecond range.