Long-range antiferromagnetic order in the frustrated XY pyrochlore antiferromagnet Er2 Ge2 O7

X. Li, W. M. Li, K. Matsubayashi, Y. Sato, C. Q. Jin, Y. Uwatoko, T. Kawae, A. M. Hallas, C. R. Wiebe, A. M. Arevalo-Lopez, J. P. Attfield, J. S. Gardner, R. S. Freitas, H. D. Zhou, J. G. Cheng

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Abstract

A cubic Er2Ge2O7 pyrochlore was prepared under high-pressure and high-temperature conditions and its magnetic ground state was investigated by measurements of specific heat, dc and ac magnetic susceptibility as functions of temperature, pressure, and magnetic field. We found that Er2Ge2O7 undergoes a long-range antiferromagnetic transition at TN ≈ 1.4 K, which can be further enhanced by applying external physical pressure. On the other hand, application of external magnetic fields suppresses the antiferromagnetic order to zero temperature around Hc ≈ 2.3 T, where a magnetic-field-induced spin-flop transition was observed. Hc increases accordingly with increasing TN under external pressure. A comparison of the magnetic ground states and structural variations along the isostructural series Er2B2O7 (B = Sn, Ti, Ge) together with the high-pressure study on Er2Ge2O7 indicated that the magnetic properties of these highly frustrated XY pyrochlore antiferromagnets are very sensitive to the minute structural changes that determine the anisotropic exchange interactions and the local crystal-electric-field environments of Er3+ ions.

Original languageEnglish
Article number064409
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number6
DOIs
Publication statusPublished - Feb 12 2014

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magnetic fields
Magnetic fields
ground state
Ground state
pressure distribution
temperature distribution
specific heat
magnetic properties
Exchange interactions
magnetic permeability
Magnetic susceptibility
electric fields
Temperature
Specific heat
Magnetic properties
crystals
Electric fields
pyrochlore
Ions
ions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Long-range antiferromagnetic order in the frustrated XY pyrochlore antiferromagnet Er2 Ge2 O7. / Li, X.; Li, W. M.; Matsubayashi, K.; Sato, Y.; Jin, C. Q.; Uwatoko, Y.; Kawae, T.; Hallas, A. M.; Wiebe, C. R.; Arevalo-Lopez, A. M.; Attfield, J. P.; Gardner, J. S.; Freitas, R. S.; Zhou, H. D.; Cheng, J. G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 89, No. 6, 064409, 12.02.2014.

Research output: Contribution to journalArticle

Li, X, Li, WM, Matsubayashi, K, Sato, Y, Jin, CQ, Uwatoko, Y, Kawae, T, Hallas, AM, Wiebe, CR, Arevalo-Lopez, AM, Attfield, JP, Gardner, JS, Freitas, RS, Zhou, HD & Cheng, JG 2014, 'Long-range antiferromagnetic order in the frustrated XY pyrochlore antiferromagnet Er2 Ge2 O7', Physical Review B - Condensed Matter and Materials Physics, vol. 89, no. 6, 064409. https://doi.org/10.1103/PhysRevB.89.064409
Li, X. ; Li, W. M. ; Matsubayashi, K. ; Sato, Y. ; Jin, C. Q. ; Uwatoko, Y. ; Kawae, T. ; Hallas, A. M. ; Wiebe, C. R. ; Arevalo-Lopez, A. M. ; Attfield, J. P. ; Gardner, J. S. ; Freitas, R. S. ; Zhou, H. D. ; Cheng, J. G. / Long-range antiferromagnetic order in the frustrated XY pyrochlore antiferromagnet Er2 Ge2 O7. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 89, No. 6.
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AB - A cubic Er2Ge2O7 pyrochlore was prepared under high-pressure and high-temperature conditions and its magnetic ground state was investigated by measurements of specific heat, dc and ac magnetic susceptibility as functions of temperature, pressure, and magnetic field. We found that Er2Ge2O7 undergoes a long-range antiferromagnetic transition at TN ≈ 1.4 K, which can be further enhanced by applying external physical pressure. On the other hand, application of external magnetic fields suppresses the antiferromagnetic order to zero temperature around Hc ≈ 2.3 T, where a magnetic-field-induced spin-flop transition was observed. Hc increases accordingly with increasing TN under external pressure. A comparison of the magnetic ground states and structural variations along the isostructural series Er2B2O7 (B = Sn, Ti, Ge) together with the high-pressure study on Er2Ge2O7 indicated that the magnetic properties of these highly frustrated XY pyrochlore antiferromagnets are very sensitive to the minute structural changes that determine the anisotropic exchange interactions and the local crystal-electric-field environments of Er3+ ions.

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