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

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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