Negative differential resistivity in Ca3Ru2O7: Unusual transport and magnetic coupling in a near-metallic system

Guertin, R. P.; Bolivar, J.; Cao, Gang; McCall, S.; Crow, J. E.

doi:10.1016/s0038-1098(98)00231-2

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Solid State Communications

1998

DOI: 10.1016/s0038-1098(98)00231-2

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Negative differential resistivity in Ca3Ru2O7: Unusual transport and magnetic coupling in a near-metallic system

R. P. Guertin

J. Bolivar

Gang Cao

et al.

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Cited by 12 publications

(15 citation statements)

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“…The striking non-ohmic "S" shape illustrates current controlled negative differential resistivity [14] (NDR) over a wide range of currents and temperatures, but restricted to T Ͻ T C3 : We stress this as a bulk effect, similar in that respect to the Gunn effect, which, however, displays "N" shaped, voltage controlled NDR I-V characteristics [15]. "S" NDR has been found in three other systems: Ca 3 Ru 2 O 7 [16], Sr 2 IrO 4 [7], and Ca 2 IrO 4 [7] also below their respective magnetic ordering temperatures. The non-hysteretic large main feature of non-linearity of the I-V characteristics may be due to an electrothermal effect which can occur in systems with dr T =dT Ͻ 0 if the heat sinking to ambient temperature is insufficient to remove joule heating.…”

mentioning

confidence: 90%

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

Cao

Crow

Guertin

et al. 2000

Solid State Communications

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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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mentioning

confidence: 90%

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

Cao

Crow

Guertin

et al. 2000

Solid State Communications

Self Cite

112

142

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“…The more common form of NDR is manifest in "N"-shaped I-V characteristics (31,32,33,34). Alternatively, an "S"-shaped NDR has been observed in various 6 memory devices (35,36) and a few bulk materials such as VO 2 , CuIr 2 S 4-x Se x , Ca 3 Ru 2 O 7 and 1T-TaS 2 (36,37,38,39,40). These bulk materials are characterized by a first-order metal-insulator transition (MIT) and, except for Ca 3 Ru 2 O 7 , are without an AFM state.…”

mentioning

confidence: 99%

Electrical Control of Structural and Physical Properties via Strong Spin-Orbit Interactions in Sr2IrO4

et al. 2018

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Electrical control of structural and physical properties is a long-sought, but elusive goal of contemporary science and technology. We demonstrate that a combination of strong spin-orbit interactions (SOI) and a canted antiferromagnetic Mott state is sufficient to attain that goal. The antiferromagnetic insulator Sr_{2}IrO_{4} provides a model system in which strong SOI lock canted Ir magnetic moments to IrO_{6} octahedra, causing them to rigidly rotate together. A novel coupling between an applied electrical current and the canting angle reduces the Néel temperature and drives a large, nonlinear lattice expansion that closely tracks the magnetization, increases the electron mobility, and precipitates a unique resistive switching effect. Our observations open new avenues for understanding fundamental physics driven by strong SOI in condensed matter, and provide a new paradigm for functional materials and devices.

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“…4͒ that bears a resemblance to a Mott system. [2][3][4][5][6][7] It is known that Ca 3 Ru 2 O 7 undergoes an antiferromagnetic ordering at T N ϭ56 K followed by a first-order metal-nonmetal transition at T MI ϭ48 K. 2 Ca 3 Ru 2 O 7 also features first-order metamagnetic and magnetoresistive transitions that lead to a field induced ferromagnetic ͑FM͒ metallic phase below T MI where spins are almost fully polarized along the a axis, the magnetic easy-axis, at Bϭ6 T. 2,3 In addition, the electron scattering rate is strong; 5 thus, there is a remarkably short mean free path l at room temperature which is highly aniso-tropic, ranging from 0.8 to 8 Å, well beyond the limit for bandlike transport, assuming a typical Fermi velocity of 10 7 -10 8 cm/s.…”

mentioning

confidence: 99%

Tunneling magnetoresistance and quantum oscillations in bilayeredCa3Ru2O
Cao
¹
,
Balicas
²
,
Xin
³

et al. 2003
Phys. Rev. B
Self Cite
52
2
78
0
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We report the interplane resistivity, c , at high magnetic fields B, with different orientations together with structural and magnetic properties of bilayered Ca 3 Ru 2 O 7 , a Mott-like system with a gap of 0.1 eV. A wide array of conventionally unanticipated phenomena revealed in this work includes ͑1͒ a collapse of the c-axis lattice parameter at a metal-nonmetal transition, ͑2͒ quantum oscillations in c in the gapped, nonmetallic state for the Bʈc axis, ͑3͒ interplane tunneling magnetoresistivity for the Bʈa or b axis, and yet conspicuously different anisotropies of the colossal magnetoresistivity and magnetization, and ͑4͒ a non-Fermi-liquid behavior in a metallic state fully recovered in high magnetic fields. The implications of the coexistence of these conflicting phenomena are discussed.

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Negative differential resistivity in Ca3Ru2O7: Unusual transport and magnetic coupling in a near-metallic system

Cited by 12 publications

References 18 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

Electrical Control of Structural and Physical Properties via Strong Spin-Orbit Interactions in Sr2IrO4

Tunneling magnetoresistance and quantum oscillations in bilayeredCa3Ru2O
Cao
¹
,
Balicas
²
,
Xin
³

et al. 2003
Phys. Rev. B
Self Cite
52
2
78
0
View full text Add to dashboard Cite

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Negative differential resistivity in Ca3Ru2O7: Unusual transport and magnetic coupling in a near-metallic system

Cited by 12 publications

References 18 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

Electrical Control of Structural and Physical Properties via Strong Spin-Orbit Interactions in Sr2IrO4

Tunneling magnetoresistance and quantum oscillations in bilayeredCa3Ru2OCao1, Balicas2, Xin3 et al. 2003Phys. Rev. BSelf Cite522780View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Tunneling magnetoresistance and quantum oscillations in bilayeredCa3Ru2O
Cao
¹
,
Balicas
²
,
Xin
³

et al. 2003
Phys. Rev. B
Self Cite
52
2
78
0
View full text Add to dashboard Cite