Ground state selection in XY pyrochlore antiferromagnets R${}_2$Ge${}_2$O${}_7$ (R = Er, Yb)

Abstract

Elastic neutron scattering, ac susceptibility, and specific heat experiments on the pyrochlores Er${}_2$Ge${}_2$O${}_7$ and Yb${}_2$Ge${}_2$O${}_7$ show that both systems are antiferromagnetically ordered in the ${\Gamma }_5$ manifold. The ground state is a ${\psi }_3$ phase for the Er sample and a ${\psi }_2$ or ${\psi }_3$ phase for the Yb sample, which suggests "Order by Disorder"(ObD) physics. Furthermore, we unify the various magnetic ground states of all known R${}_2$B${}_2$O${}_7$ (R = Er, Yb, B = Sn, Ti, Ge) compounds through the enlarged XY type exchange interaction $J_{\pm }$ under chemical pressure. The mechanism for this evolution is discussed in terms of the phase diagram proposed in the theoretical study [Wong et al., Phys. Rev. B 88, 144402, (2013)].

5 pages, 4 figures, with supplemental material

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