Antiferromagnetic order in the pyrochlores ${R}_{2}{\mathrm{Ge}}_{2}{\mathrm{O}}_{7} (R=\mathrm{Er},\mathrm{Yb})$

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Antiferromagnetic order in the pyrochlores $R_{2} {Ge}_{2} O_{7} (R = Er, Yb)$

Z. L. Dun, X. Li, R. S. Freitas, E. Arrighi, C. R. Dela Cruz, M. Lee, E. S. Choi, H. B. Cao, H. J. Silverstein, C. R. Wiebe, J. G. Cheng, and H. D. Zhou

Phys. Rev. B 92, 140407(R) – Published 7 October 2015

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 $Γ_{5}$ manifold. The ground state is a $ψ_{3}$ phase for the Er sample and a $ψ_{2}$ or $ψ_{3}$ phase for the Yb sample, which suggests “Order by Disorder” physics. Furthermore, we unify the various magnetic ground states of all known $R_{2} X_{2} O_{7}$ ( $R = Er$ , Yb; $X = Sn$ , Ti, Ge) compounds through the enlarged $X Y$ -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 by Wong et al. [Phys. Rev. B 88, 144402 (2013)].

Received 9 April 2015
Revised 16 September 2015

DOI:https://doi.org/10.1103/PhysRevB.92.140407

Authors & Affiliations

Z. L. Dun¹, X. Li², R. S. Freitas³, E. Arrighi³, C. R. Dela Cruz⁴, M. Lee^5,6, E. S. Choi⁶, H. B. Cao⁴, H. J. Silverstein⁷, C. R. Wiebe^6,7,8,9, J. G. Cheng², and H. D. Zhou^1,6

¹Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA
²Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
³Instituto de Fisica, Universidade de Sao Paulo, CP 66318, 05314-970 Sao Paulo, SP, Brazil
⁴Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37381, USA
⁵Department of Physics, Florida State University, Tallahassee, Florida 32306-3016, USA
⁶National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310-3706, USA
⁷Department of Chemistry, University of Manitoba, Winnipeg, Canada MB R3T 2N2
⁸Department of Chemistry, University of Winnipeg, Winnipeg, MB, Canada R3B 2E9
⁹Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z7

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Vol. 92, Iss. 14 — 1 October 2015

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Physical Review B

covering condensed matter and materials physics

Antiferromagnetic order in the pyrochlores $R_{2} {Ge}_{2} O_{7} (R = Er, Yb)$

Z. L. Dun, X. Li, R. S. Freitas, E. Arrighi, C. R. Dela Cruz, M. Lee, E. S. Choi, H. B. Cao, H. J. Silverstein, C. R. Wiebe, J. G. Cheng, and H. D. Zhou

Phys. Rev. B 92, 140407(R) – Published 7 October 2015

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Physical Review B

covering condensed matter and materials physics

Antiferromagnetic order in the pyrochlores R2Ge2O7 (R=Er,Yb)

Z. L. Dun, X. Li, R. S. Freitas, E. Arrighi, C. R. Dela Cruz, M. Lee, E. S. Choi, H. B. Cao, H. J. Silverstein, C. R. Wiebe, J. G. Cheng, and H. D. Zhou

Phys. Rev. B 92, 140407(R) – Published 7 October 2015

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Antiferromagnetic order in the pyrochlores $R_{2} {Ge}_{2} O_{7} (R = Er, Yb)$