# Antiferromagnetic order in the pyrochloresR2Ge2O7 (R=Er,Yb) Academic Article

•
• Overview
•
• Research
•
• Identity
•
•
• View All
•

### 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)].

### authors

• Dun, ZL
• Li, X
• Freitas, RS
• Arrighi, E
• Dela Cruz, CR
• Lee, M
• Choi, ES
• Cao, HB
• Silverstein, HJ
• Wiebe, Christopher
• Cheng, JG
• Zhou, HD

### publication date

• October 7, 2015