Weak ferromagnetism in BaIrO3

Lindsay, Robert; Strange, Wayne; Chamberland, B.L.; Moyer, Ralph O.

doi:10.1016/0038-1098(93)90186-q

Cited by 47 publications

(46 citation statements)

References 9 publications

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“…From a modified Curie-Weiss fit to the data for T c3 Ͻ T Ͻ 400 K; the effective paramagnetic moment of the Ir ion is m eff Ϸ0.13m B /Ir and the Curie-Weiss temperature, QϷ175 K, matched T C3 . The Ir moment is much lower than expected for the low spin S 1=2; 2 T 2g state of Ir 4ϩ (5d 5 ) which has degenerate d xz and d yz orbitals and an excited half filled d xy orbital, but both T C and the moment value are in substantial agreement with the results of Lindsay et al [4] for polycrystalline material. Similar low Ir moments are found for ferromagnetic Sr 2 IrO 4 T C 250 K; m eff 0:04m B =Ir as well as for CaIrO 3 and Ca 2 IrO 4 [7,12].…”

supporting

confidence: 85%

“…However, to our knowledge, density wave formation has not yet been observed accompanying the onset of ferromagnetic order. However, the ferromagnetism at T c3 175 K in BaIrO 3 [4] appears to be accompanied by and possibly driven by a collective electronic excitation or at least partial gapping of the Fermi surface. This demonstrates once again the strong coupling between spin and charge in the heavy (4d-and 5d-based) TMOs [5][6][7].…”

mentioning

confidence: 95%

“…Such a small Ir moment in BaIrO 3 is probably intrinsic due to d-p hybridization and small exchange splitting, rather than spin canting from a localized full-moment antiferromagnetic spin configuration [4]. This is based not only on the low value of the effective moment, but also on our magnetization measurements to 30 T dc fields at several temperatures 5 Յ T Յ 200 K: No higher field induced transitions were found and full saturation to m 0 Ϸ0.03m B /Ir was not achieved until 20 T for T 5 K: Higher pulsed field magnetization measurements to 55 T also do not show any field induced transitions.…”

mentioning

confidence: 99%

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Charge density wave formation accompanying ferromagnetic ordering in quasi-one-dimensional BaIrO3

Cao

Crow

Guertin

et al. 2000

Solid State Communications

112

142

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The magnetic, transport, optical, and structural properties of quasi-one-dimensional BaIrO 3 show evidence for the simultaneous onset of electronic density wave formation and ferromagnetism at T c3 175 K: Two additional features in the chain direction dc conductivity show a sudden change to metallic behavior below T c2 80 K and then a Mott-like transition at T c1 26 K: Highly non-linear dc conductivity, optical gap formation at Ϸ9k B T c3 , additional phonon modes, and emergent X-ray satellite structure support density wave formation. Even at very high (30 T) fields the saturation Ir moment is very small, Ϸ0.04m B /Ir. ᭧ 2000 Elsevier Science Ltd. All rights reserved. Transition metal oxides (TMO) with low crystalline symmetry are known to exhibit electronic density wave formation [1][2][3]. However, to our knowledge, density wave formation has not yet been observed accompanying the onset of ferromagnetic order. However, the ferromagnetism at T c3 175 K in BaIrO 3 [4] appears to be accompanied by and possibly driven by a collective electronic excitation or at least partial gapping of the Fermi surface. This demonstrates once again the strong coupling between spin and charge in the heavy (4d-and 5d-based) TMOs [5][6][7]. BaIrO 3 has a highly anisotropic quasi-one-dimensional structure [8][9][10] and this gives rise, in our single crystal samples, to large anisotropy of r(T), the electrical resistivity, with the quasi-one-dimensional axis, the c-axis, having much lower resistivity. This kind of low-dimensional structure is necessary for the formation of an insulating charge density wave (CDW) ground state, which is a collective electron mode normally incommensurate with the underlying lattice for partially filled bands [3].Evidence for density wave formation comes from: (1) A discontinuous increase in the slope of r (T) vs. T at T c3 T C ; the Curie temperature-an abrupt transition to a more insulating phase. (Two additional features of r (T) along the c-axis, at T c2 80 K and T c1 26 K; mark a sudden return to "metallic" behavior (possibly a crossover from partial toward full gapping of the Fermi surface) and a well-defined Mott-like metal-insulator transition, respectively). (2) An abrupt feature in the non-linear conductivity showing negative differential resistivity. (3) Gap formation at about 1200 cm Ϫ1 in the electron excitation spectrum and a splitting of a phonon mode at 350 cm Ϫ1 , which appear for T Ͻ T c3 (This was determined by optical reflectivity studies in the far and near infrared.). (4) Additional satellite formation for T Ͻ T C3 in the X-ray diffraction spectrum.The structure of BaIrO 3 is monoclinic and consists of Ir 3 O 12 trimers of face-sharing IrO 6 octahedra which are vertex-linked to other trimeric clusters forming columns roughly parallel to the c-axis. These clusters form channels accommodating Ba ions. The space group is C2/m and the

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confidence: 85%

mentioning

confidence: 95%

mentioning

confidence: 99%

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Charge density wave formation accompanying ferromagnetic ordering in quasi-one-dimensional BaIrO3

Cao

Crow

Guertin

et al. 2000

Solid State Communications

112

142

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“…9R BaIrO 3 As mentioned above, 9R BaIrO 3 is the first known ferromagnet among the 5d TMOs [17]. Cao et al [18] performed the first detailed experimental study on the single-crystal samples and uncovered a CDW formation accompanying the ferromagnetic order at T c ≈ 180…”

Section: Physical Propertiesmentioning

confidence: 95%

“…It is the first known ferromagnetic insulator with T c ≈ 180 K among the 5d TMOs [17]. Detailed studies on single crystals revealed a charge-density-wave (CDW) formation below the ferromagnetic order [18,51].…”

Section: Bairomentioning

confidence: 99%

Synthesis, Crystal Structure, and Physical Properties of the Perovskite Iridates

Cai¹,

Li²,

Cheng³

2016

Perovskite Materials - Synthesis, Characterisation, Properties, and Applications

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Perovskite iridates have emerged as a new paradigm for studying the strongly correlated electron physics with strong spin-orbit coupling. The "113" alkaline-earth iridates AIrO 3 (A = Ca, Sr, Ba) display a rich variety of crystallographic and electronic states and are now attracting growing research interest. This chapter aims to provide an overview for these "113" iridates, including the materials' synthesis, crystal structure, major physical properties, and other interesting results such as the effects of pressure and chemical substitutions, as well as theoretical perspectives.

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Crystal and Magnetic Structure of Sr₂BIrO₆ (B = Sc, Ti, Fe, Co, In) in the Framework of Multivalent Iridium Double Perovskites

et al. 2015

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The preparation, crystal structure and magnetic properties of Sr 2 BIrO 6 (B = In, Sc, Fe, Co or Ti) oxides are reported. For B = Sc, Fe, Co or In materials, X-ray and neutron powder diffraction (NPD) studies confirm the presence of 1:1 B-ordered perovskite-like structures crystallizing in the monoclinic I2/ m and P2 1 /n space groups, with unit-cell parameters a ≈ √2a 0 , b ≈ √2a 0 , c ≈ 2a 0 and β ≈ 90°. Sr 2 TiIrO 6 is described as a disordered perovskite with orthorhombic symmetry in the Pbnm space group. For B = Fe and Co, low-temperature NPD[a]

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Weak ferromagnetism in BaIrO3

Cited by 47 publications

References 9 publications

Charge density wave formation accompanying ferromagnetic ordering in quasi-one-dimensional BaIrO3

Charge density wave formation accompanying ferromagnetic ordering in quasi-one-dimensional BaIrO3

Synthesis, Crystal Structure, and Physical Properties of the Perovskite Iridates

Crystal and Magnetic Structure of Sr₂BIrO₆ (B = Sc, Ti, Fe, Co, In) in the Framework of Multivalent Iridium Double Perovskites

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Weak ferromagnetism in BaIrO3

Cited by 47 publications

References 9 publications

Charge density wave formation accompanying ferromagnetic ordering in quasi-one-dimensional BaIrO3

Charge density wave formation accompanying ferromagnetic ordering in quasi-one-dimensional BaIrO3

Synthesis, Crystal Structure, and Physical Properties of the Perovskite Iridates

Crystal and Magnetic Structure of Sr2BIrO6 (B = Sc, Ti, Fe, Co, In) in the Framework of Multivalent Iridium Double Perovskites

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Crystal and Magnetic Structure of Sr₂BIrO₆ (B = Sc, Ti, Fe, Co, In) in the Framework of Multivalent Iridium Double Perovskites