Heat capacity of rare-earth aluminum garnets

Shevchenko, E. V.; Charnaya, E. V.; Хазанов, Е. Н.; Таранов, А. В.; Бугаев, А. С.

doi:10.1016/j.jallcom.2017.05.106

Cited by 18 publications

(4 citation statements)

References 17 publications

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“…On our C/T curve, the transition peak broadens and moves to a higher temperature with increasing field strength. A similar change due to changes in magnetic field has been observed in the aluminum garnets Er 27,28,38 In the applied-field-dependent integrated entropy for both samples, we observed that the saturated entropy decreased with increasing field. This is unlike the case for spin-ice-like magnetism, 39 but is consistent with triangular frustrated magnetic materials such as LiYbSe 2 and ErMgGaO 4 .…”

Section: ■ Results and Discussionsupporting

confidence: 85%

“…On our C / T curve, the transition peak broadens and moves to a higher temperature with increasing field strength. A similar change due to changes in magnetic field has been observed in the aluminum garnets Er 3– x Tm x Al 5 O 12 , Y 3– x Er x Al 5 O 12 , Er 2 HoAl 5 O 12 , and Ho 1.5 Y 1.5 Al 5 O 12 and attributed to Schottky anomalies dominating at low temperatures. ,, In the applied-field-dependent integrated entropy for both samples, we observed that the saturated entropy decreased with increasing field. This is unlike the case for spin-ice-like magnetism, but is consistent with triangular frustrated magnetic materials such as LiYbSe 2 and ErMgGaO 4 . , To quantitively compare the frustration between two samples, we calculated the percentage drop in saturated entropy from 0 to 3 T, which is 58 and 63% for Er 3 Ga 5 O 12 and Er 3.5 Ga 4.5 O 12 , respectively.…”

Section: Resultssupporting

confidence: 83%

“…Our results further suggest that although the temperature-dependent magnetic susceptibility (per Er) above 1.8 K is not significantly impacted by the excess erbium, there is a systematic increase in the residual entropy with increasing Er excess. Although a study of the specific heat capacity under applied magnetic fields in Er 3– x Tm x Al 5 O 12 has been reported, field-dependent heat capacity data for Er 3 Ga 5 O 12 have not been reported to the best of our knowledge. ,, Therefore, specific heat under 1T and 3T applied magnetic fields will be provided for Er 3 Ga 5 O 12 and Er 3.5 Ga 4.5 O 12 .…”

Section: Introductionmentioning

confidence: 97%

“…Although a study of the specific heat capacity under applied magnetic fields in Er 3−x Tm x Al 5 O 12 has been reported, field-dependent heat capacity data for Er 3 Ga 5 O 12 have not been reported to the best of our knowledge. 18,27,28 Therefore, specific heat under 1T and 3T applied magnetic fields will be provided for Er 3 Ga 5 O 12 and Er 3.5 Ga 4.5 O 12 .…”

Section: ■ Introductionmentioning

confidence: 99%

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Erbium-Excess Gallium Garnets

et al. 2023

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A series of garnets of formula Er3+x Ga5–x O12 are described, for which we report the crystal structures for both polycrystalline and single-crystal samples. The x limit in the garnet phase is between 0.5 and 0.6 under our conditions, with the Er fully occupying the dodecahedral (24c) garnet site plus some of the octahedral site (16a) in place of the Ga normally present. Long-range antiferromagnetic order with spin-ice-like frustration is suggested by the transition temperature (T N ≈ 0.8 K) being lower than the Curie–Weiss theta. The magnetic ordering temperature does not depend on the Er excess, but there is increasing residual entropy as the Er excess is increased, highlighting the potential for unusual magnetic behavior in this system. The field-dependent magnetic entropy trend is consistent with the reported behavior for frustrated triangular magnetic systems: an increasing transition temperature with a broader hump as the applied field increases [XingJ. Xing, J. 114413Phys. Rev. Mater.20193 FilippiJ. Filippi, J. Solid State Commun.197723613616; Thermal and Magnetic Studies of Spin Ice CompoundsBloxsomJ. A. Bloxsom, J. A. University College London2016.

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“…On our C/T curve, the transition peak broadens and moves to a higher temperature with increasing field strength. A similar change due to changes in magnetic field has been observed in the aluminum garnets Er 27,28,38 In the applied-field-dependent integrated entropy for both samples, we observed that the saturated entropy decreased with increasing field. This is unlike the case for spin-ice-like magnetism, 39 but is consistent with triangular frustrated magnetic materials such as LiYbSe 2 and ErMgGaO 4 .…”

Section: ■ Results and Discussionsupporting

confidence: 85%

“…On our C / T curve, the transition peak broadens and moves to a higher temperature with increasing field strength. A similar change due to changes in magnetic field has been observed in the aluminum garnets Er 3– x Tm x Al 5 O 12 , Y 3– x Er x Al 5 O 12 , Er 2 HoAl 5 O 12 , and Ho 1.5 Y 1.5 Al 5 O 12 and attributed to Schottky anomalies dominating at low temperatures. ,, In the applied-field-dependent integrated entropy for both samples, we observed that the saturated entropy decreased with increasing field. This is unlike the case for spin-ice-like magnetism, but is consistent with triangular frustrated magnetic materials such as LiYbSe 2 and ErMgGaO 4 . , To quantitively compare the frustration between two samples, we calculated the percentage drop in saturated entropy from 0 to 3 T, which is 58 and 63% for Er 3 Ga 5 O 12 and Er 3.5 Ga 4.5 O 12 , respectively.…”

Section: Resultssupporting

confidence: 83%