Metal-Insulator Transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>PrRu</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>with Skutterudite Structure

Sekine, Chihiro; Uchiumi, Takanori; Shirotani, Ichimin; Yagi, T.

doi:10.1103/physrevlett.79.3218

Cited by 410 publications

(279 citation statements)

References 20 publications

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“…1b). Surprisingly, we see that there is no apparent anomaly in the low field magnetization at the metal-insulator transition at T c1 26 K [13] even for H k c-axis.…”

mentioning

confidence: 87%

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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“…1b). Surprisingly, we see that there is no apparent anomaly in the low field magnetization at the metal-insulator transition at T c1 26 K [13] even for H k c-axis.…”

mentioning

confidence: 87%

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 onset of σ(ω) suggests a gap magnitude of about 10 meV, which is close to the transport gap of 7 meV given by ρ(T ). 1 In addition to the gap, a broad peak centered around 50 meV is observed, where sharp optical phonon peaks are superimposed. This broad peak should result from optical excitation of electrons across the energy gap, and will be referred to as the "gap excitation peak".…”

Section: B σ(ω) Data At High Pressurementioning

confidence: 99%

“…1,2 With a single crystal sample, ρ increased by a factor of ∼ 400 from T MI to 2 K. 2 From the analysis of ρ(T ) data, the magnitude of the energy gap was estimated to be ∼ 7 meV. 1 In addition, the development of an energy gap was clearly observed in the measured optical conductivity [σ(ω)] spectrum. 3 In discussing the mechanism for this transition, it was pointed out from band calculations that the Fermi surface (FS) of PrRu 4 P 12 should have a cube-like shape, with a strong tendency for three dimensional (3D) nesting.…”

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confidence: 99%

Pressure suppression of unconventional charge-density-wave state in PrRu4P12studied by optical conductivity

et al. 2012

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Optical conductivity [σ(ω)] of PrRu4P12 has been studied under high pressure to 14 GPa, at low temperatures to 8 K, and at photon energies 12 meV-1.1 eV. The energy gap in σ(ω) at ambient pressure, caused by a metal-insulator transition due to an unconventional charge-density-wave formation at 63 K, is gradually filled in with increasing pressure to 10 GPa. At 14 GPa and below 30 K, σ(ω) exhibits a pronounced Drude-type component due to free carriers. This indicates that the initial insulating ground state at zero pressure has been turned into a metallic one at 14 GPa. This is consistent with a previous resistivity study under pressure, where the resistivity rapidly decreased with cooling below 30 K at 14 GPa. The evolution of electronic structure with pressure is discussed in terms of the hybridization between the 4f and conduction electrons.

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“…On the other hand, PrRu4P12 shows a metalinsulator transition with breathing type staggered lattice distortion [7] . The crystal symmetry remains cubic in the low temperature phase [8].…”

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confidence: 99%

Diffraction from ordered states of higher multipoles

Kuramoto

Kusunose

Kiss

2006

Physica B: Condensed Matter

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Possible ways of identification are discussed of an electronic order of higher multipoles such as octupoles and hexadecapoles. A particularly powerful method is resonant X-ray scattering (RXS) using quadrupolar resonance processes called E2. The characteristic azimuthal angle dependence of Ce0.7La0.3B6 is interpreted as evidence of antiferro-octupole order. For PrRu4P12, eightfold pattern against azimuthal angle is predicted if its metal-insulator transition is a consequence of a hexadecapole order. In non-resonant superlattice Bragg scattering, hexadecapole contribution may also be identified because of absence of quadrupole component.

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Metal-Insulator Transition inPrRu4P12with Skutterudite Structure

Cited by 410 publications

References 20 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

Pressure suppression of unconventional charge-density-wave state in PrRu4P12studied by optical conductivity

Diffraction from ordered states of higher multipoles

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