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Transcript
Single crystal growth of Heisenberg spin ladder and spin chain
Bingying Pan, Weinan Dong, Xiaochen Hong and Shiyan Li
Department of Physics, Fudan University, Shanghai, China
Low dimensional magnets have attracted great attention because of their simplicity in theoretical
models, novel quantum phenomena and relation to high temperature superconductivity. Among
them, quasi-1D systems such as spin ladders and spin chains have found their realization in
several materials, especially in some organic-metal compounds which can sustain good 1D
dimensionality down to very low temperature. We have grown Heisenberg spin ½
antiferromagnetic spin ladder (C5H12N)2CuBr4 by evaporation method and obtained
(C5H12N)CuBr3 in a similar way. We identify (C5H12N)CuBr3 as a Heisenberg spin chain via its
magnetic property and crystal structure. No antiferromagnetic transition was observed down to
1.8K. Thermal conductivity measurement down to millikelvin will be measured soon, to detect
the low-energy excitations in them.