Local-Ising-type magnetic order and metamagnetism in the rare-earth pyrogermanate Er2Ge2O7

Taddei, Keith M.; Sanjeewa, Liurukara D.; Kolis, Joseph W.; Sefat, Athena Safa; Dela Cruz, Clarina R.; Pajerowski, Daniel M.

doi:10.1103/physrevmaterials.3.014405

Title: Local-Ising-type magnetic order and metamagnetism in the rare-earth pyrogermanate ${Er}_{2} {Ge}_{2} O_{7}$

Journal Article · Fri Jan 11 00:00:00 EST 2019 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.3.014405· OSTI ID:1490717

^[1]; Sanjeewa, Liurukara D. ^[2]; Kolis, Joseph W. ^[3];

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Clemson Univ., SC (United States). Dept. of Chemistry
Clemson Univ., SC (United States). Dept. of Chemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

The recent discoveries of proximate quantum spin-liquid compounds and their potential application in quantum computing informs the search for new candidate materials for quantum spin-ice and spin-liquid physics. While the majority of such work has centered on members of the pyrochlore family due to their inherently frustrated linked tetrahedral structure, the rare-earth pyrogermanates also show promise for possible frustrated magnetic behavior. With the familiar stoichiometry R₂Ge₂O₇, these compounds generally have tetragonal symmetry with a rare-earth sublattice built of a spiral of alternating edge and corner-sharing rare-earth site triangles. Studies on Dy₂Ge₂O₇ and Ho₂Ge₂O₇ have shown tunable low temperature antiferromagnetic order, a high frustration index, and spin-ice-like dynamics. Here we use neutron diffraction to study magnetic order in Er₂Ge₂O₇ (space group P4₁2₁2) and find the lowest yet Neél temperature in the pyrogermanates of 1.15 K. Using neutron powder diffraction, we find the magnetic structure to order with k=(0,0,0) ordering vector, magnetic space group symmetry P4'₁2₁2', and a refined Er moment of m=8.1μ_B near the expected value for the Er³⁺ free ion. Provocatively, the magnetic structure exhibits similar “local Ising” behavior to that seen in the pyrocholres where the Er moment points up or down along the short Er-Er bond. Upon applying a magnetic field, we find a first-order metamagnetic transition at ~0.35T to a lower symmetry P2'₁2'₁2 structure. This magnetic transition involves an inversion of Er moments aligned antiparallel to the applied field describing a class I spin-flip-type transition, indicating a strong local anisotropy at the Er site—reminiscent of that seen in the spin-ice pyrochlores.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Clemson Univ., SC (United States)

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

Grant/Contract Number:: AC05-00OR22725; SC0014271

OSTI ID:: 1490717

Alternate ID(s):: OSTI ID: 1490561; OSTI ID: 1596457

Journal Information:: Physical Review Materials, Vol. 3, Issue 1; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Title: Local-Ising-type magnetic order and metamagnetism in the rare-earth pyrogermanate Er 2 Ge 2 O 7

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Title: Local-Ising-type magnetic order and metamagnetism in the rare-earth pyrogermanate ${Er}_{2} {Ge}_{2} O_{7}$