Casola, F.Shiroka, T.Feiguin, A.Wang, S.Grbie, MSHorvatie, M.Kramer, S.Mukhopadhyay, S.Conder, K.Berthier, C.Ott, HRRonnow, Henrik M.Ruegg, C.Mesot, J.2013-06-272013-06-272013-06-27201310.1103/PhysRevLett.110.187201https://infoscience.epfl.ch/handle/20.500.14299/93011WOS:000319015600012Based on high-field 31P nuclear magnetic resonance experiments and accompanying numerical calculations, it is argued that in the frustrated S=1/2 ladder compound BiCu2PO6 a field-induced soliton lattice develops above a critical field of μ0Hc1=20.96(7) T. Solitons result from the fractionalization of the S=1, bosonlike triplet excitations, which in other quantum antiferromagnets are commonly known to experience Bose-Einstein condensation or to crystallize in a superstructure. Unlike in spin-Peierls systems, these field-induced quantum domain walls do not arise from a state with broken translational symmetry and are triggered exclusively by magnetic frustration. Our model predicts yet another second-order phase transition at Hc2>Hc1, driven by soliton-soliton interactions, most likely corresponding to the one observed in recent magnetocaloric and other bulk measurements.text::journal::journal article::research article