Effect of chemical pressure on the crystal electric field states of erbium pyrochlore magnets

Gaudet, J; Hallas, A. A.; Kolesnikov, Alexander I.; Gaulin, Bruce D.

doi:10.1103/PhysRevB.97.024415

Title: Effect of chemical pressure on the crystal electric field states of erbium pyrochlore magnets

Journal Article · Wed Jan 17 00:00:00 EST 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.024415· OSTI ID:1432150

Gaudet, J ^[1]; Hallas, A. A. ^[1];

^[2]; Gaulin, Bruce D. ^[3]

McMaster Univ., Hamilton, ON (Canada)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
McMaster Univ., Hamilton, ON (Canada); Brockhouse Inst. for Materials Research, Hamilton, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (United States)

We have carried out a systematic study of the crystal electric field excitations in the family of cubic pyrochlores Er₂B₂O₇ with B=Ge, Ti, Pt, and Sn, using neutron spectroscopy. All members of this family are magnetic insulators based on 4f¹¹Er³⁺ and nonmagnetic B⁴⁺. At sufficiently low temperatures, long-range antiferromagnetic order is observed in each of these Er₂B₂O₇ pyrochlores. The different ionic sizes associated with different nonmagnetic B⁴⁺ cations correspond to positive or negative chemical pressure, depending on the relative contraction or expansion of the crystal lattice, which gives rise to different local environments at the Er³⁺ site. Our results show that the g-tensor components are XY-like for all four members of the Er₂B₂O₇ series. However, the XY anisotropy is much stronger for Er₂Pt₂O₇ and Er₂Sn₂O₇(g⊥/gz>25) than for Er₂Ge₂O₇ and Er₂Ti₂O₇(g⊥/gz<4). The variation in the nature of the XY anisotropy in these systems correlates strongly with their ground states as Er₂Ge₂O₇ and Er₂Ti₂O₇ order into Γ₅ magnetic structures, whereas Er₂Pt₂O₇ and Er₂Sn₂O₇ order in the Γ₇ Palmer-Chalker structure.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1432150

Alternate ID(s):: OSTI ID: 1417229

Journal Information:: Physical Review B, Vol. 97, Issue 2; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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