Spin-singlet quantum ground state in zig-zag spin ladder Cu(CF3COO)2статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 17 октября 2017 г.
Аннотация:The copper salt of trifluoroacetic acid Cu(CF3COO)2 offer new platform to investigate the quantum ground states of low-dimensional magnets. In practice, it realizes the ideal case of solid hosting essentially isolated magnetic monolayers. These entities are constituted by well separated two-leg half-integer spin ladders organized in zig-zag fashion. The ladders are comprised by dimeric units of CuO5 trigonal bipyramids coupled through carbon ions. The spin-gapped state in this compound was revealed by static and dynamic magnetic measurements. No indications of long range magnetic ordering down to liquid helium temperatures were obtained in specific heat measurements. The first principles calculations allow estimation of main exchange interaction parameters, Jperp = 176 K and Jpar = 12 K, consistent with weakly interacting dimers model.