Magnetic structure and exchange interactions in the Heisenberg pyrochlore antiferromagnet Gd2Pt2O7

Welch, Philip G.; Paddison, Joseph M.; Le, Manh Duc; Gardner, Jason S.; Chen, Wei-Tin; Wildes, Andrew R.; Goodwin, Andrew L.; Stewart, J. Ross

doi:10.1103/physrevb.105.094402

Title: Magnetic structure and exchange interactions in the Heisenberg pyrochlore antiferromagnet Gd₂Pt₂O₇

Journal Article · Tue Mar 01 00:00:00 EST 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.094402· OSTI ID:1854463

Welch, Philip G. ^[1]; Paddison, Joseph M. ^[2]; Le, Manh Duc ^[3];

^[2];

^[4]; Wildes, Andrew R. ^[5];

^[6];

^[3]

Univ. of Oxford (United Kingdom); Rutherford Appleton Laboratory, Didcot (United Kingdom)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Rutherford Appleton Laboratory, Didcot (United Kingdom)
National Taiwan Univ., Taipei (Taiwan)
Institut Laue-Langevin, Grenoble (France)
Univ. of Oxford (United Kingdom)

In this report the Heisenberg pyrochlore antiferromagnet Gd₂Pt₂O₇ is one of a series of gadolinium pyrochlore compounds with a variety of B-site cations. Despite the expected simplicity of a spin-only Gd³⁺ Heisenberg interaction model, the gadolinium pyrochlore series exhibits various complex magnetic ground states at low temperature. Gd₂Pt₂O₇ displays the highest temperature magnetic order of the series with $$T_N$$=1.6 K, which has been attributed to enhanced superexchange pathways facilitated by empty $5d$ $$e_g$$ Pt orbitals. In this study, we use various neutron scattering techniques on an isotopically enriched polycrystalline ¹⁶⁰Gd₂Pt₂O₇ sample to examine the magnetic structure and spin-wave excitation spectrum below $$T_N$$ in order to extract the dominant exchange interactions. We find that the ground-state magnetic structure is the Palmer-Chalker state previously seen in Gd₂Sn₂O₇ with an associated gapped excitation spectrum consistent with enhanced exchange interactions between further near-neighbor Gd³⁺ ions. We confirm this exchange model with analysis of the magnetic diffuse scattering in the paramagnetic regime using polarized neutrons.

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

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; UKRI Engineering and Physical Sciences Research Council; Science and Facilities Research Council

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1854463

Journal Information:: Physical Review. B, Vol. 105, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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