Chemical pressure effects on magnetism in the quantum spin liquid candidates Yb$_{2}$B$_{2}$O$_{7}$ (B = Sn, Ti, Ge)
ORAL
Abstract
The linear and nonlinear AC susceptibility measurements of Yb-pyrochlores, Yb$_{2}$B$_{2}$O$_{7}$ (B = Sn, Ti and Ge), show a ferromagnetic ordering at 0.13 K but with short range ordering nature for Yb$_{2}$Sn$_{2}$O$_{7}$, a ferromagnetic ordering at 0.25 K for Yb$_{2}$Ti$_{2}$O$_{7}$, and an antiferromagnetic ordering at 0.62 K for Yb$_{2}$Ge$_{2}$O$_{7}$. These systematical results (i) clarified the nature of the controversial magnetic ground state in Yb$_{2}$Ti$_{2}$O$_{7}$; (ii) realized a distinct antiferromagnetic ordering state in Yb$_2$Ge$_2$O$_7$; and (iii) demonstrated that the application of chemical pressure through the series of Yb-pyrochlores can efficiently perturb the fragile quantum spin fluctuations of the Yb$^{3+}$ ions and lead to very different magnetic ground states.
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