In BaNd2ZnS5, field along [110] closes the lower spin gap at ~2 T while the higher gap remains open, yielding mode-selective quantum criticality with chi_ac ~ T^{-0.2} scaling and residual Sommerfeld coefficient.
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Field-Induced Selective Spin Gap Closure and Quantum Criticality in BaNd$_2$ZnS$_5$
In BaNd2ZnS5, field along [110] closes the lower spin gap at ~2 T while the higher gap remains open, yielding mode-selective quantum criticality with chi_ac ~ T^{-0.2} scaling and residual Sommerfeld coefficient.