Enhanced electric polarizability at the magnetic ordering temperature of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi ma

Cao, G.; O’Reilly, J. W.; Crow, J. E.; Testardi, L. R.

doi:10.1103/physrevb.47.11510

Cited by 47 publications

(17 citation statements)

References 15 publications

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“…3͑a͒, where M͑T͒ is compared to the real part of the c-axis dielectric constant c Ј͑T,͒, which has two major features: ͑1͒ c Ј͑T͒ rises by one order of magnitude and peaks near T M , similar to La 2 CuO 4 . 15 This strong enhancement of c Ј͑T͒ is much larger than that exhibited by well-known in region II suggests a relaxor mechanism 19 -e.g., due to magnetic frustration, disorder, or a soft-mode of the lattice. The relatively sharp peak with strong frequency dispersion signals a novel frustrated or disordered magnetic/ ferroelectric state in the shaded area in Fig.…”

mentioning

confidence: 87%

Giant magnetoelectric effect in the Jeff=1/2 Mott insulator Sr2IrO4

Saito

Korneta

Crummett

et al. 2010

Journal of Applied Physics

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Strong spin-orbit, crystal field, and Coulomb interactions compete to drive a narrow-gap Mott state in Sr2IrO4. Our study of the magnetic, thermal, and electrical properties of single-crystal Sr2IrO4 reveals a giant magnetoelectric effect (GME) arising from a frustrated magnetic/ferroelectric state below 240 K. The GME features (1) a strongly enhanced electric permittivity that peaks near a newly observed magnetic anomaly at 100 K, and (2) a large magnetodielectric shift (100%) near a metamagnetic transition.

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mentioning

confidence: 87%

Giant magnetoelectric effect in the Jeff=1/2 Mott insulator Sr2IrO4

Saito

Korneta

Crummett

et al. 2010

Journal of Applied Physics

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“…4a and 4b. The real parts ε c ' (T) and ε a ' (T) of the c-and a-axis dielectric constants, resp., rise by up to one order of magnitude and peak near T M , similar to La 2 CuO 4 [24]. The enhancement of ε c ' (T) is much larger than that exhibited by well-known magneto-electrics such as BaMnF 4 [25], BiMnO 3 [26], HoMnO 3 and YMnO 3 [27].…”

Section: Giant Magnetoelectricity: Sr 2 Iromentioning

confidence: 95%

The promise of strong spin-orbit coupling: Novel materials with novel properties for novel devices

Long

Shlyk

Cao

et al. 2010

2010 International Conference on Electromagnetics in Advanced Applications

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Discoveries of new materials can lead to improved technologies---especially if relevant properties can be widely varied and precisely controlled. New materials may exhibit unexpected phenomena that motivate theoretical breakthroughs and quantitative models for optimizing devices. We discuss single crystal data for the R-type ferrites BaFe2±xRu4±xO11 and the Ruddleson-Popper phase Sr2IrO4, in which strong spin-orbit interactions lead to unusual magnetic, dielectric and transport properties suitable for novel devices.

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“…As described by Equation (19), for the regime of concern here, ε 0 >> ε ∞ , the contribution to σ xx (ω) from photo-ionization of planar large bipolarons approaches that for photo-ionizing twice as many planar large polarons of binding energy E p ≅ e 2 /4ε ∞ R p whose self-trapped electronic carriers have threshold ionization energy 3E p [cf. Equation (11) of Ref.…”

Section: Conductivity Of a Large-bipolaron Liquidmentioning

confidence: 99%

“…Unusually large values of ε 0 /ε ∞ (>>2) are measured in layered cuprates [17][18][19]. These huge values are attributed to very loosely bound ions that reside off the CuO 2 planes.…”

Section: Introductionmentioning

confidence: 96%

In-plane conductivity of a layered large-bipolaron liquid

Emin

2015

Philosophical Magazine

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Distinctive normal-state properties of cuprate superconductors follow from their charge carriers forming a large-bipolaron liquid. The very weak scattering of the slow-moving heavy-massed excitations of the liquid by acoustic phonons yields a scattering rate that is less than the Debye frequency. The moderate liquid mobility, greater than 1 cm2/V-sec at 300 K, results as the weak scattering of the liquid compensates for its large mass. In resolution of a long-standing dilemma, the dc resistivity resulting from scattering by acoustic phonons remains nearly proportional to temperature to well below the Debye temperature. Above the Debye frequency the frequency-dependent conductivity is dominated by excitation and photo-ionization of the self-trapped electronic carriers of the large-bipolarons. Below the Debye frequency the frequency-dependent conductivity is dominated by the Drude-like collective motion of the large-bipolaron liquid. The gap between these two domains sharpens with decreasing temperature as phonon scattering of the liquid diminishes. The high-frequency electronic excitations survive in the superconducting state

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Enhanced electric polarizability at the magnetic ordering temperature ofLa2CuO4+

Cited by 47 publications

References 15 publications

Giant magnetoelectric effect in the Jeff=1/2 Mott insulator Sr2IrO4

Giant magnetoelectric effect in the Jeff=1/2 Mott insulator Sr2IrO4

The promise of strong spin-orbit coupling: Novel materials with novel properties for novel devices

In-plane conductivity of a layered large-bipolaron liquid

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