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Thermal transport of quantum magnets has elucidated the nature of low energy elementary excitations and complex interplay between those excited states via strong scattering of thermal carriers. BiCu 2 PO 6  is a unique frustrated spin-ladder compound exhibiting highly anisotropic spin excitations that contain both itinerant and localized dispersion characters along the  b - and  a -axes respectively. Here, we investigate thermal conductivity  κ  of BiCu 2 PO 6  under high magnetic fields ( H ) of up to 30 tesla. A dip-feature in  κ , located at ~15 K at zero- H  along all crystallographic directions, moves gradually toward lower temperature ( T ) with increasing  H , thus resulting in giant suppression by a factor of ~30 near the critical magnetic field of  H  c  ≅ 23.5 tesla. The giant  H-  and  T- dependent suppression of  κ  can be explained by the combined result of resonant scattering of phononic heat carriers with magnetic energy levels and increased phonon scattering due to enhanced spin fluctuation at  H  c , unequivocally revealing the existence of strong spin-phonon coupling. Moreover, we find an experimental indication that the remaining magnetic heat transport along the  b -axis becomes almost gapless at the magnetic quantum critical point realized at  H  c .

Giant suppression of phononic heat transport in a quantum magnet BiCu2PO6