Drastic Change of Magnetic Phase Diagram in Doped Quantum Antiferromagnet TlCu${}_{1-x}$Mg${}_x$Cl${}_3$

M. Fujisawa, T. Ono, H. Fujiwara +6

TlCuCl${}_3$ is a coupled spin dimer system, which has a singlet ground state with an excitation gap of $\Delta /g{\mu }_{\mathrm{B}}$ = 5.5 T. TlCu${}_{1-x}$Mg${}_x$Cl${}_3$ doped with nonmagnetic Mg…