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Updated: May 16, 2026

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Anisotropic cascade of field-induced phase transitions in the frustrated spin-ladder system BiCu2PO6
Yoshimitsu Kohama1, Shuang Wang, Atsuko Uchida
1MPA-CMMS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Abstract:
BiCu(2)PO(6) is a frustrated two-leg spin-ladder compound with a spin gap that can be closed with a magnetic field of approximately 20 T. This quantum phase transition and its related phase diagram as a function of magnetic field and temperature (H, T) are investigated up to 60 T by means of specific heat, magnetocaloric effect, magnetization, and magnetostriction measurements. In contrast to other gapped quantum magnets, BiCu(2)PO(6) undergoes a series of unexpected first- and second-order phase transitions when an external magnetic field is applied along the crystallographic c axis. The application of a magnetic field along the b axis induces two second-order phase transitions. We propose that the anisotropy and complex phase diagram result from the interplay between strong geometrical frustration and spin-orbit interaction necessary for the description of this fascinating magnetic system.
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