High pressure synthesis and characterization of the pyrochlore Dy2Pt2O7: A new spin ice material

Qi Cui; Yun Qi Cai; Xiang Li; Zhi Ling Dun; Pei Jie Sun; Jian Shi Zhou; Hai Dong Zhou; Jin Guang Cheng

doi:10.1088/1674-1056/ab7b58

High pressure synthesis and characterization of the pyrochlore Dy₂Pt₂O₇: A new spin ice material

Qi Cui, Yun Qi Cai, Xiang Li, Zhi Ling Dun, Pei Jie Sun, Jian Shi Zhou, Hai Dong Zhou, Jin Guang Cheng^*

^*Corresponding author for this work

School of Physics

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

3 Citations (Scopus)

Abstract

The cubic pyrochlore Dy₂Pt₂O₇ was synthesized under 4 GPa and 1000 C and its magnetic and thermodynamic properties were characterized by DC and AC magnetic susceptibility and specific heat down to 0.1 K. We found that Dy₂Pt₂O₇ does not form long-range magnetic order, but displays characteristics of canonical spin ice such as Dy₂Ti₂O₇, including (1) a large effective moment 9.64 μ _B close to the theoretical value and a small positive Curie-Weiss temperature θ _CW = +0.77 K signaling a dominant ferromagnetic interaction among the Ising spins; (2) a saturation moment ∼4.5 μ _B being half of the total moment due to the local 111 Ising anisotropy; (3) thermally activated spin relaxation behaviors in the low (∼1 K) and high (∼20 K) temperature regions with different energy barriers and characteristic relaxation time; and most importantly, (4) the presence of a residual entropy close to Pauling' estimation for water ice.

Original language	English
Article number	047502
Journal	Chinese Physics B
Volume	29
Issue number	4
DOIs	https://doi.org/10.1088/1674-1056/ab7b58
Publication status	Published - Apr 2020

Keywords

DyPtO
high-pressure synthesis
pyrochlore oxide
spin ice

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10.1088/1674-1056/ab7b58

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title = "High pressure synthesis and characterization of the pyrochlore Dy2Pt2O7: A new spin ice material",

abstract = "The cubic pyrochlore Dy2Pt2O7 was synthesized under 4 GPa and 1000 C and its magnetic and thermodynamic properties were characterized by DC and AC magnetic susceptibility and specific heat down to 0.1 K. We found that Dy2Pt2O7 does not form long-range magnetic order, but displays characteristics of canonical spin ice such as Dy2Ti2O7, including (1) a large effective moment 9.64 μ B close to the theoretical value and a small positive Curie-Weiss temperature θ CW = +0.77 K signaling a dominant ferromagnetic interaction among the Ising spins; (2) a saturation moment ∼4.5 μ B being half of the total moment due to the local 111 Ising anisotropy; (3) thermally activated spin relaxation behaviors in the low (∼1 K) and high (∼20 K) temperature regions with different energy barriers and characteristic relaxation time; and most importantly, (4) the presence of a residual entropy close to Pauling' estimation for water ice.",

keywords = "DyPtO, high-pressure synthesis, pyrochlore oxide, spin ice",

author = "Qi Cui and Cai, {Yun Qi} and Xiang Li and Dun, {Zhi Ling} and Sun, {Pei Jie} and Zhou, {Jian Shi} and Zhou, {Hai Dong} and Cheng, {Jin Guang}",

note = "Publisher Copyright: {\textcopyright} 2020 Chinese Physical Society and IOP Publishing Ltd.",

year = "2020",

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doi = "10.1088/1674-1056/ab7b58",

language = "English",

volume = "29",

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TY - JOUR

T1 - High pressure synthesis and characterization of the pyrochlore Dy2Pt2O7

T2 - A new spin ice material

AU - Cui, Qi

AU - Cai, Yun Qi

AU - Li, Xiang

AU - Dun, Zhi Ling

AU - Sun, Pei Jie

AU - Zhou, Jian Shi

AU - Zhou, Hai Dong

AU - Cheng, Jin Guang

PY - 2020/4

Y1 - 2020/4

N2 - The cubic pyrochlore Dy2Pt2O7 was synthesized under 4 GPa and 1000 C and its magnetic and thermodynamic properties were characterized by DC and AC magnetic susceptibility and specific heat down to 0.1 K. We found that Dy2Pt2O7 does not form long-range magnetic order, but displays characteristics of canonical spin ice such as Dy2Ti2O7, including (1) a large effective moment 9.64 μ B close to the theoretical value and a small positive Curie-Weiss temperature θ CW = +0.77 K signaling a dominant ferromagnetic interaction among the Ising spins; (2) a saturation moment ∼4.5 μ B being half of the total moment due to the local 111 Ising anisotropy; (3) thermally activated spin relaxation behaviors in the low (∼1 K) and high (∼20 K) temperature regions with different energy barriers and characteristic relaxation time; and most importantly, (4) the presence of a residual entropy close to Pauling' estimation for water ice.

AB - The cubic pyrochlore Dy2Pt2O7 was synthesized under 4 GPa and 1000 C and its magnetic and thermodynamic properties were characterized by DC and AC magnetic susceptibility and specific heat down to 0.1 K. We found that Dy2Pt2O7 does not form long-range magnetic order, but displays characteristics of canonical spin ice such as Dy2Ti2O7, including (1) a large effective moment 9.64 μ B close to the theoretical value and a small positive Curie-Weiss temperature θ CW = +0.77 K signaling a dominant ferromagnetic interaction among the Ising spins; (2) a saturation moment ∼4.5 μ B being half of the total moment due to the local 111 Ising anisotropy; (3) thermally activated spin relaxation behaviors in the low (∼1 K) and high (∼20 K) temperature regions with different energy barriers and characteristic relaxation time; and most importantly, (4) the presence of a residual entropy close to Pauling' estimation for water ice.

KW - DyPtO

KW - high-pressure synthesis

KW - pyrochlore oxide

KW - spin ice

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DO - 10.1088/1674-1056/ab7b58

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SN - 1674-1056

VL - 29

JO - Chinese Physics B

JF - Chinese Physics B

IS - 4

M1 - 047502

ER -

High pressure synthesis and characterization of the pyrochlore Dy₂Pt₂O₇: A new spin ice material

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