Unstable spin-ice order in the stuffed metallic pyrochlore Pr2+xIr2-xO7-δ

MacLaughlin, D. E.; Bernal, O. O.; Shu, Lei; Ishikawa, Jun; Matsumoto, Yosuke; Wen, Jia -Jia; Mourigal, Martin P.; Stock, C.; Ehlers, Georg; Broholm, C. L.; Machida, Yo; Kimura, Kenta; Nakatsuji, Satoru; Shimura, Yasuyuki; Sakakibara, Toshiro

doi:10.1103/PhysRevB.92.054432

Title: Unstable spin-ice order in the stuffed metallic pyrochlore Pr_2+xIr_2-xO_7-δ

Journal Article · Mon Aug 24 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.054432· OSTI ID:1213348

MacLaughlin, D. E. ^[1]; Bernal, O. O. ^[2]; Shu, Lei ^[3]; Ishikawa, Jun ^[4]; Matsumoto, Yosuke ^[4]; Wen, Jia -Jia ^[5]; Mourigal, Martin P. ^[5]; Stock, C. ^[6]; Ehlers, Georg ^[7]; Broholm, C. L. ^[8]; Machida, Yo ^[4]; Kimura, Kenta ^[4]; Nakatsuji, Satoru ^[9]; Shimura, Yasuyuki ^[4]; Sakakibara, Toshiro ^[4]

Univ. of California, Riverside, CA (United States); Univ. of Tokyo, Chiba (Japan)
California State Univ., Los Angeles, CA (United States)
Univ. of California, Riverside, CA (United States); Fudan Univ., Shanghai (China)
Univ. of Tokyo, Chiba (Japan)
John Hopkins Univ., Baltimore, MD (United States)
John Hopkins Univ., Baltimore, MD (United States); National Institute of Standards and Technology, Gaithersburg, MD (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
John Hopkins Univ., Baltimore, MD (United States); National Institute of Standards and Technology, Gaithersburg, MD (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tokyo, Chiba (Japan); Japan Science and Technology Agency, Saitama (Japan)

Specific heat, elastic neutron scattering, and muon spin rotation experiments have been carried out on a well-characterized sample of “stuffed” (Pr-rich) Pr_2+xIr_2-xO_7-δ. Elastic neutron scattering shows the onset of long-range spin-ice “2-in/2-out” magnetic order at 0.93 kelvin, with an ordered moment of 1.7(1) Bohr magnetons per Pr ion at low temperatures. Approximate lower bounds on the correlation length and correlation time in the ordered state are 170 angstroms and 0.7 nanosecond, respectively. Muon spin rotation experiments yield an upper bound 2.6(7) milliteslas on the local field B^4f_loc at the muon site, which is nearly two orders of magnitude smaller than the expected dipolar field for long-range spin-ice ordering of 1.7-Bohr magneton moments (120–270 milliteslas, depending on the muon site). This shortfall is due in part to splitting of the non-Kramers crystal-field ground-state doublets of near-neighbor Pr³⁺ ions by the positive-muon-induced lattice distortion. For this to be the only effect, however, ~160 Pr moments out to a distance of ~14 angstroms must be suppressed. An alternative scenario—one consistent with the observed reduced nuclear hyperfine Schottky anomaly in the specific heat—invokes slow correlated Pr-moment fluctuations in the ordered state that average B^4f_loc on the μSR time scale (~10^-7 second), but are static on the time scale of the elastic neutron scattering experiments (~10^-9 second). In this picture, the dynamic muon relaxation suggests a Pr³⁺ 4f correlation time of a few nanoseconds, which should be observable in a neutron spin echo experiment.

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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)

Grant/Contract Number:: AC05-00OR22725; FG02-08ER46544

OSTI ID:: 1213348

Alternate ID(s):: OSTI ID: 1212489

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 5; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Selective probing of magnetic order on Tb and Ir sites in stuffed Tb ₂ Ir ₂ O ₇ using resonant x-ray scattering Donnerer, C.; Rahn, M. C.; Schierle, E. Journal of Physics: Condensed Matter, Vol. 31, Issue 34 https://doi.org/10.1088/1361-648x/ab2217	journal	June 2019
Selective probing of magnetic order on Tb and Ir sites in stuffed Tb$_{2+x}$Ir$_{2-x}$O$_{7-y}$ using resonant X-ray scattering Donnerer, C.; Rahn, M. C.; Schierle, E. arXiv https://doi.org/10.48550/arxiv.1910.05551	text	January 2019

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