Piyakulworawat C.Thennakoon A.Yang J.Yoshizawa H.Ueta D.Sato T.J.Sheng K.Chen W.T.Pai W.W.Matan K.Lee S.H.Mahidol University2024-03-292024-03-292024-03-01Physical Review B Vol.109 No.10 (2024)24699950https://repository.li.mahidol.ac.th/handle/20.500.14594/97788Thermodynamics studies of a prototypical quasi-two-dimensional frustrated magnet, Ba2Sn2ZnCr7pGa10-7pO22, where the magnetic Cr3+ ions are arranged in a triangular network of bipyramids show that the magnetic zero-point entropy for p=0.98 is 55(1)% of the entropy expected when the Cr3+ moments are fully disordered. Furthermore, when combined with a previous neutron scattering study and the perimeter scaling entropy of a spin jam, the analysis reveals that with decreasing p, i.e., doping of the nonmagnetic Ga3+ ions, the variation in the magnetic zero-point entropy can be well explained by the combined effects of the zero-point entropy of the spin jam state and that of weakly coupled orphan spins, shedding light on the coexistence of the two types of spin states in quantum magnetism.Materials SciencePhysics and AstronomyArticleSCOPUS10.1103/PhysRevB.109.1044202-s2.0-8518842693424699969