Magnetocaloric effect in single crystal GdTiO3

Omote, Hideki; Watanabe, Shota; Matsumoto, Koichí; Gilmutdinov, I. F.; Kiiamov, Airat; Tayurskiı̆, D. A.

doi:10.1016/j.cryogenics.2019.05.008

“…The shift of −ΔS m as well as the simultaneous ordering of the rareearth and transition-metal moments 13) indicates that the interactions between the rare-earth and transition-metal moments are strong. 5) and RTiO 3 [6][7][8][9][10] despite the strong interactions between rare-earth and Ru magnetic moments.…”

Section: Resultsmentioning

confidence: 96%

Magnetocaloric Effect in the Double Perovskites Sr<sub>2</sub>RRuO<sub>6</sub> (R = Dy and Tb)

Hase

¹

,

Tsujii

²

,

Mamiya

³

2020

J. Jpn. Soc. Powder Powder Metallurgy

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We studied the magnetic entropy change (ΔS m) of the double perovskites Sr 2 RRuO 6 (R = Dy and Tb). The magnetic entropy change shows a peak near the second-order phase transition temperature (~40 K). The values of maximum −ΔS m and relative cooling power for a magnetic-field change of 5 T are 2.41 J/(kg K) and 48 J/kg for the DyRu compound and 1.72 J/(kg K) and 36 J/kg for the TbRu compound, respectively. Strong interactions between the rare-earth and transition-metal magnetic moments shift −ΔS m of the rare-earth moments to high temperatures. We compared the results of Sr 2 RRuO 6 (R = Dy and Tb) with those of oxides possessing a giant magnetocaloric effect.

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“…− S m,max vs T max of oxides containing both rare-earth and transition-metal magnetic ions and having T max that is close to the magnetic transition temperature of transition-metal moments. Tb: Tb 3 RuO 7 , Gd: Gd 3 RuO 7 , a: ErCrO 4 [30], b: HoCrO 4 [31], c: GdCrO 4 [32], d: DyCrO 4 [31], e: Er 2 Mn 2 O 7 [33], f: Sr 2 DyRuO 6 [34], g: Sr 2 TbRuO 6 [34], A: TbMnO 3 (H//a) [35], B: GdTiO 3 (H//c) [36], C: YbTiO 3 (H//c) [37], D: ErTiO 3 (H//c) [37], E: HoTiO 3 (H//c) [38], F: DyTiO 3 (H//c) [39], G: TmTiO 3 (H//c) [40]. Open and closed circles represent oxides with ferromagnet order and other magnetic order of transition-metal moments, respectively.…”

Section: A Magnetizationmentioning

confidence: 99%

Magnetic structures of nearly isostructural Tb3RuO7 and Nd3RuO7 : Appearance of a partially disordered state o

Hase

¹

,

Dönni

²

,

Pomjakushin

³

2021

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We report on the magnetic structures of Tb 3 RuO 7 and Nd 3 RuO 7 determined from powder neutron-diffraction experiments. In Tb 3 RuO 7 , alternating-bond spin-3 2 Ru1-Ru2 chains are formed. The Ru1 and Ru2 moments are ordered and disordered (paramagnetic), respectively, below 15 K. This result indicates the appearance of a partially disordered (PD) state, although the two Ru sites are very similar to each other. In Nd 3 RuO 7 , the Ru1 and Ru2 ions form independent uniform chains. Both the Ru1 and Ru2 moments are ordered below 17.5 K. Probably, the main source of the PD state in Tb 3 RuO 7 is the magnetic frustration in the exchange interactions. The internal magnetic field generated by the Tb ordered moments at the Ru1 sites is different from that at the Ru2 sites. We speculate that the different (nonuniform) internal magnetic field enhances the difference in the properties between the Ru1 and Ru2 moments. We also report on the magnetic entropy changes of Tb 3 RuO 7 and Gd 3 RuO 7 .

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“…In the spin-1 2 frustrated three-leg-ladder Heisenberg antiferromagnets Cu 3 (OH) 4 AO 4 (A = S or Se), the Cu moments within the two outer legs are ordered, whereas the Cu moments within the inner leg remain random [42,43]. In the spin- 1 2 frustrated quasi-onedimensional antiferromagnet Cu 3 Mo 2 O 9 , the Cu moments within the dimers are ordered, whereas the Cu moments within the chains remain random [44] b: Ho 2 O 3 [30], c: Er 6 WO 12 [31], d: Ho 6 WO 12 [31], e: Dy 6 WO 12 [31], f: Gd 2 O 3 [32], g: Sr 2 DyNbO 6 [33], h: Tm 6 MoO 12 [31], i: Sr 2 YRuO 6 [33], j: Sr 2 DyRuO 6 [33], k: Sr 2 TbRuO 6 [33], l: Er 2 Mn 2 O 7 [34], A: TbMnO 3 (H//a) [35], B: GdTiO 3 (H//c) [36], C: YbTiO 3 (H//c) [37], D: ErTiO 3 (H//c) [37], E: HoTiO 3 (H//c) [38], F: DyTiO 3 (H//c) [39], G: TmTiO 3 (H//c) [40]. Lowercase and uppercase letters indicate the data for powders and single crystals, respectively.…”

Section: B Origin Of the Partially Disordered Statementioning

confidence: 99%

Magnetic structure of Tb3RuO7 possessing alternating-bond spin-3/2 Ru chains in a nonuniform internal magnetic field: appearance of a partially disordered state

Hase,

Dönni,

Pomjakushin

2021

Preprint

0

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We report on the magnetic structures of Tb 3 RuO 7 and Nd 3 RuO 7 determined from powder neutron-diffraction experiments. In Tb 3 RuO 7 , alternating-bond spin-3 2 Ru1-Ru2 chains are formed. The Ru1 and Ru2 moments are ordered and disordered (paramagnetic), respectively, below 15 K. This result indicates the appearance of a partially disordered (PD) state, although the two Ru sites are very similar to each other. In Nd 3 RuO 7 , the Ru1 and Ru2 ions form independent uniform chains. Both the Ru1 and Ru2 moments are ordered below 17.5 K. Probably, the main source of the PD state in Tb 3 RuO 7 is the magnetic frustration in the exchange interactions. The internal magnetic field generated by the Tb ordered moments at the Ru1 sites is different from that at the Ru2 sites. We speculate that the different (nonuniform) internal magnetic field enhances the difference in the properties between the Ru1 and Ru2 moments. We also report on the magnetic entropy changes of Tb 3 RuO 7 and Gd 3 RuO 7 .

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Magnetocaloric effect in single crystal GdTiO3

Cited by 23 publications

References 24 publications

Magnetocaloric Effect in the Double Perovskites Sr<sub>2</sub>RRuO<sub>6</sub> (R = Dy and Tb)

Magnetocaloric Effect in the Double Perovskites Sr<sub>2</sub>RRuO<sub>6</sub> (R = Dy and Tb)

Magnetic structures of nearly isostructural Tb3RuO7 and Nd3RuO7 : Appearance of a partially disordered state o

Magnetic structure of Tb3RuO7 possessing alternating-bond spin-3/2 Ru chains in a nonuniform internal magnetic field: appearance of a partially disordered state

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