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

doi:10.1103/PhysRevB.89.064409

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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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 language	English
Article number	064409
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.89.064409
Publication status	Published - 12 Feb 2014
Externally published	Yes

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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. (2014). Long-range antiferromagnetic order in the frustrated XY pyrochlore antiferromagnet Er₂ Ge₂ O₇. Physical Review B - Condensed Matter and Materials Physics, 89(6), Article 064409. https://doi.org/10.1103/PhysRevB.89.064409

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title = "Long-range antiferromagnetic order in the frustrated XY pyrochlore antiferromagnet Er2 Ge2 O7",

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.",

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

year = "2014",

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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

TY - JOUR

T1 - Long-range antiferromagnetic order in the frustrated XY pyrochlore antiferromagnet Er2 Ge2 O7

AU - Li, X.

AU - Li, W. M.

AU - Matsubayashi, K.

AU - Sato, Y.

AU - Jin, C. Q.

AU - Uwatoko, Y.

AU - Kawae, T.

AU - Hallas, A. M.

AU - Wiebe, C. R.

AU - Arevalo-Lopez, A. M.

AU - Attfield, J. P.

AU - Gardner, J. S.

AU - Freitas, R. S.

AU - Zhou, H. D.

AU - Cheng, J. G.

PY - 2014/2/12

Y1 - 2014/2/12

N2 - 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.

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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DO - 10.1103/PhysRevB.89.064409

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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

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