Quantification of local Ising magnetism in rare-earth pyrogermanates Er2Ge2O7 and Yb2Ge2O7

Pajerowski, Daniel M.; Taddei, Keith M.; Sanjeewa, Liurukara D.; Savici, Andrei T.; Stone, Matthew B.; Kolis, Joseph W.

doi:10.1103/PhysRevB.101.014420

Title: Quantification of local Ising magnetism in rare-earth pyrogermanates ${Er}_{2} {Ge}_{2} O_{7}$ and ${Yb}_{2} {Ge}_{2} O_{7}$

Journal Article · 15 January 2020 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.101.014420 · OSTI ID:1606915

^[1];

^[1]; Sanjeewa, Liurukara D. ^[2];

^[1];

^[1]; Kolis, Joseph W. ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Clemson Univ., SC (United States)
Clemson Univ., SC (United States)

Recently, a local-Ising-type magnetic order was inferred from neutron diffraction of the antiferromagnetic Er₂Ge₂O₇ (pg-ErGO) with an applied magnetic field. Here, we use neutron spectroscopy to investigate the energetics of pg-ErGO and the isostructural Yb₂Ge₂O₇ (pg-YbGO) to evaluate the adequacy of the local-Ising description. To begin, we generate a model of the magnetic structure of pg-YbGO using neutron diffraction and find a net ferromagnetic moment. While pg-ErGO and pg-YbGO have highly symmetric crystal structures (P4₁2₁2 tetragonal space group 92) with only one trivalent rare-earth magnetic site, the point symmetry of the rare-earth site is low with only a single symmetry element (point group C₁). For both compounds, the energy scale of the first excited state is large compared to the magnetic ordering temperature, suggesting Ising character. The ground-state Kramer's doublet of both compounds is dominated by the maximal m_J component. However, the low point group symmetry of the rare-earth site leads to finite mixing of all other m_J's, which suggests potential deviations from Ising behavior. Moreover, quasielastic scattering is observed deep in the ordered state of pg-ErGO and pg-YbGO that may be due to non-Ising behavior. The dominant magnetic interaction in both compounds is found to be magnetostatic by considering the magnetic excitations in the ordered state. Lastly, from consideration of these data, the pg-YbGO is more Ising-like than pg-ErGO. Also, quantum multicritical points are anticipated with applied magnetic field in both compounds.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1606915

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 101; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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