Geometric magnetic frustration in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi></mml:math>-type ferrite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>SrSn</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Ga</mml:mtext></mml:mrow><mml:mrow><mml:mn>1.3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Cr</mml:mtext></mml:mrow><mml:mrow><mml:mn>2.7</

Posen, I. Daniel; McQueen, Tyrel M.; Williams, A. J.; West, D. V.; Huang, Q.; Cava, R. J.

doi:10.1103/physrevb.81.134413

Cited by 8 publications

(3 citation statements)

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“…The results of all the 3 /mmc to P6 3 /m has been observed due to ruthenium pairing in the kagome network[18][19][20]. Here, neither such phenomenon nor 2d sites splitting[13,26], i.e., a reduction of symmetry from P6 3 /mmc to P6 3 mc due to tetragonal bipyramid splitting to two tetrahedra, has been detected. On the one hand, TableIshows that the 2a (A site), 6g, and 2d sites occupancy are relatively similar for the three oxides, within 6% at most.…”

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confidence: 66%

“…The valencies determined 72 from x-ray diffraction and charge-balance calculations are re-73 ported to be Mn 3+ [14], Co 2+ or Fe 2+ /Fe 3+ , and Ru 3+ /Ru 5+ 74 [25]. In BaMRu 5 O 11 , the face-shared site contains Ru 4+ cal-75 culated from bond valence sum while the valency is closer 76 to 3.8 in the kagome lattice [14], and recent x-ray absorption 77 These materials present a rich variety of properties with frustrated magnetism arising from the kagome lattice as reported in BaZnRu 5 O 11 [18], in SrNiRu 5 O 11 [20], or in SrSn 2 Ga 1.3 Cr 2.7 O 11 [26], and possible spintronic applications for metallic and ferrimagnetic materials in SrCo 1.89 Ru 4.11 O 11 [16] or in BaFe 2±x Ru 4∓x O 11 [27]. The complex magnetic structure of BaFe 2±x Ru 4∓x O 11 with spin chirality in the kagome planes leads to a strong anomalous Hall effect [27].…”

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confidence: 96%

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Thermopower in the Ba1−δM2+xRu4−xO11<

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For comparison, the Ru metallic sample crystallizes in a 255 hexagonal structure, of the same space group of P6 3 /mmc as 256 the 124 ruthenates, and its elementary cell parameters are a = 257 b = 2.7092(1) Å and c = 4.2887(1) Å with a Ru-Ru distance 258 of about 2.67 Å. 259 B. 57 Fe Mössbauer experiments 260 For Sr 1−δ Fe 2.7 Ru 3.3 O 11 , Mössbauer spectrometry was used 261 to investigate in more detail the Fe distribution in the dif-262 ferent crystallographic sites and to investigate the Fe nature 263 in this oxide. The Mössbauer spectra of Sr 1−δ Fe 2.7 Ru 3.3 O 11 264 compound at 295 K (room temperature) and at 20 K (low 265 temperature) are shown in Fig. 4. The room-temperature 266 spectrum shape in the paramagnetic phase contains three 267 overlapping quadrupole doublets, each one associated with 268 a specific Fe site [Fig. 4(a)]. It is important to note that the 269 amount of metallic Fe impurity (0.02 wt.%) deduced from 270 the Rietveld refinement is too small to be detected by Möss-271 bauer spectroscopy, especially since the spectral area of such 272 The evolution of MR with T presented in Fig. 10(a) shows 455 that MR continuously decreases as a function of temperature, 456 except around T C where a maximum is observed for M = Co 457 and M = Mn. At low T, the high-field MR values follow the 458 magnetization behavior M, with MR the largest for M = Mn. 459 At 5 K and 5 T, the comparison with Fig. 7 shows that 460 these MR values follow the evolution of magnetization M 461 and moreover reflect the evolution of the M 2 behavior, with 462 MR ∼ M 2 , i.e., MR(M = Mn)/MR(M = Fe) = 3, similar to 463 the ratio M 2 (M = Mn)/M 2 (M = Fe), while these ratios reach 464 close values respectively, 2.5 and 3.5, for the comparison 465 between Fe and Co. This low-temperature M 2 behavior is 466 typically observed in the presence of spin-polarized tunnel-467 ing at grain boundaries as in manganites [42] or in SrRuO 3 468 [38] and most probably reflects the polycrystalline nature of 469 the samples. Consistently, the M(H) and MR(H) curves are 470 interrelated, as the MR curves are reversible for M = Co, 471 Mn, but display hysteresis below ∼25 kOe for M = Fe, in 472 good agreement with the large coercive field measured on the 473 M(H) loops (Fig. 7). It is interesting to note that three differ-474 ent behaviors are observed depending on the transition-metal 475 cation M, with a maximum of MR observed around T C for 476 M = Co, a maximum at 5 K observed for M = Mn together 477 with a secondary maximum around T C , and finally only very 478 small values for M = Fe and no peak around T C . The coupling 479 between magnetism and transport at T C is therefore maximum 480 for M = Co. 481 3. Thermopower 482 The temperature-dependent Seebeck coefficients S(T ) 483 of the three samples are presented in Fig. 11. In 484 A 1−δ Mn 2.4 Ru 3.6 O 11 , S(T ) is linear and positive from ∼100 to 485 750 K, reaching ∼22.5 μV K -1 . At T < 100 K, S is very close 486 Sr 2 RuO 4 [12] with Ru 4+ , which gave for the high-T limit 561 S = (k B ...

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Section: Introductionmentioning

confidence: 96%

Thermopower in the Ba1−δM2+xRu4−xO11<

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“…To date the successful synthesis of ideal SrCr 9 Ga 3 O 19 has yet to be achieved; in the limiting composition of SrCr 8.8 Ga 3.2 O 19 ∼ 2% of the Cr 3+ sites are occupied by non-magnetic Ga 3+ [8]. A deficiency of Cr 3+ in the layered ferrite materials is not unique to SCGO; in both Ba 2 Sn 2 ZnGa 3 Cr 7 O 22 (BSZGCO, a QS-type ferrite) [16,17] and SrSn 2 Ga 1.3 Cr 2.7 O 11 (SSGCO, an R-type ferrite) [18] deficiencies of Cr 3+ on the kagome plane of 3% and 10%, respectively, are observed. The Ga-rich end of the SCGO compositional series has been extensively studied and it has been shown that Ga fully occupies the tetrahedral and trigonal bipyramidal sites, with Ga and Cr disordered over the octahedral sites [5,6,8,10].…”

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confidence: 99%

Magnetic properties of hole-doped SCGO, SrCr₈Ga_4−xM_xO₁₉(M = Zn, Mg, Cu)

Hanson

Broholm

Slusky

et al. 2011

J. Phys.: Condens. Matter

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We report changes in the magnetic properties of hole-doped SCGO, SrCr8Ga4O19, induced by replacing non-magnetic Ga3+ with both non-magnetic (Mg2+ and Zn2+) and magnetic (Cu2+) cations. The resulting solid solutions, SrCr(8)Ga(4-x)M(x)O(19) (M = Zn, Mg, Cu) have been studied by x-ray diffraction and magnetic susceptibility measurements. For all cases, at least 10% of Ga can be replaced by divalent cations resulting in oxidation of ≥5% of the Cr3+ d3 to Cr4+ (d2). The hole doping results in an increase in ferromagnetic interactions and reduces the magnetic frustration. In the SrCr(8)Ga(4-x)Cu(x)O(19) series an enhancement of the spin-glass-like transition is observed, T(f)∼ 6 K, which we ascribe to the magnetic nature of the Cu2+ (d9) dopant.

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