XY antiferromagnetic ground state in the effective S=12 pyrochlore Yb2Ge2O7

Hallas, Alannah M.; Gaudet, J.; Wilson, Murray N.; Munsie, Timothy J.; Aczel, Adam A.; Stone, Matthew B.; Freitas, R. S.; Arevalo-Lopez, A. M.; Attfield, J. P.; Tachibana, Makoto; Wiebe, Christopher; Luke, Graeme M.; Gaulin, Bruce D.

doi:10.1103/PhysRevB.93.104405

Title: XY antiferromagnetic ground state in the effective $S = \frac{1}{2}$ pyrochlore ${Yb}_{2} {Ge}_{2} O_{7}$

Journal Article · Tue Mar 01 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.104405· OSTI ID:1528742

Hallas, Alannah M. ^[1]; Gaudet, J. ^[1]; Wilson, Murray N. ^[1]; Munsie, Timothy J. ^[1];

^[2];

^[2]; Freitas, R. S. ^[3]; Arevalo-Lopez, A. M. ^[4]; Attfield, J. P. ^[4]; Tachibana, Makoto ^[5]; Wiebe, Christopher ^[6]; Luke, Graeme M. ^[7]; Gaulin, Bruce D. ^[7]

McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Univ. de São Paulo, São Paulo (Brazil). Inst. de Física
Univ. of Edinburgh, Edinburgh (United Kingdom)
National Inst. for Materials Science (NIMS), Tsukuba (Japan)
Univ. of Winnipeg, Winnipeg, Manitoba (Canada). Dept. of Chemistry
McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy; Canadian Inst. for Advanced Research, Toronto, ON (Canada)

We report neutron scattering and muon spin relaxation measurements (μSR) on the pyrochlore antiferromagnet Yb₂Ge₂O₇. Inelastic neutron scattering was used to probe the transitions between crystal electric field levels, allowing us to determine the eigenvalues and eigenvectors appropriate to the J=$$\frac{7}{2}$$ Yb³⁺ ion in this environment. The crystal electric field ground state doublet in Yb₂Ge₂O₇ corresponds primarily to m_J=± $$\frac{1}{2}$$ with local XY anisotropy, consistent with an S_eff = 12 description for the Yb moments. $$μ$$SR measurements reveal the presence of an ordering transition at T_N=0.57 K with persistent weak dynamics in the ordered state. Finally, we present neutron diffraction measurements that reveal a clear phase transition to the $$k$$=(000)$$Γ_5$$ ground state with an ordered magnetic moment of 0.3(1)$$μ_B$$ per Yb ion. We compare and contrast this phenomenology with the low-temperature behavior of Yb₂Ti₂O₇ and Er₂Ti₂O₇, the prototypical S_eff= $$\frac{1}{2}$$ XY pyrochlore magnets.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1528742

Alternate ID(s):: OSTI ID: 1240478

Journal Information:: Physical Review B, Vol. 93, Issue 10; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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