Enhancement of metallic behavior in bismuth cobaltates through lead doping

Loureiro, S.M.; Young, David P.; Cava, R. J.; Liu, Y.; Bordet, Pierre; Qin, Yueling; Zandbergen, H.W.; Godinho, M.; Núñez-Regueiro, M.; Batlogg, B.

doi:10.1103/physrevb.63.094109

Cited by 19 publications

(18 citation statements)

References 22 publications

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“…In contrast, temperature dependence of the resistivity measured along the [001] axis (ρ zz ) is rather complicated. As temperature decreases from 340 K, ρ zz first increases, shows a broad maximum at around 200 K, and then decreases below 200 K. The broad peak of the interlayer resistivity indicates incoherent-coherent crossover of electric conduction [15][16][17][18][19][20] at ~200 K. Above ~200 K, transport mean free path along the [001] direction is shorter than the interlayer distance, and the hopping conduction becomes dominant. A similar incoherent-coherent crossover was reported in isostructural SrMnBi 2…”

Section: Resultsmentioning

confidence: 99%

Large Magneto-piezoelectric Effect in EuMnBi2 Single Crystal at Low Temperatures

Shiomi

Masuda

Takahashi

et al. 2020

Sci Rep

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Magneto-piezoelectric effect (MPE) refers to generation of strain in response to electric currents in magnetic metals which lack both time-reversal and space-inversion symmetries. A recent experimental paper demonstrated the Mpe in the antiferromagnetic metal euMnBi 2 at 77 K, but the limited temperature range of the Mpe measurement hampered detailed discussion on the Mpe. Here we extend the measurement temperature range down to liquid He temperature, and studied the dependences of the Mpe on the laser position, frequency and amplitude of electric currents, and temperature in the very low temperature range. We show that the Mpe signal is enhanced at low temperatures and reaches a maximum magnitude in the antiferromagnetically ordered states of both Eu and Mn ions. An effective piezoelectric coefficient for the MPE at 4.5 K is estimated to be as large as 3500 pC/N, which is much larger than piezoelectric coefficients of typical piezoelectric ceramics, although the magnitude of real Mpe displacements should be limited due to strong Joule heating at high electric currents. the present results may open up a new strategy to realize new lead-free piezoelectric materials.

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Section: Resultsmentioning

confidence: 99%

Large Magneto-piezoelectric Effect in EuMnBi2 Single Crystal at Low Temperatures

Shiomi

Masuda

Takahashi

et al. 2020

Sci Rep

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“…48 Though superconductivity has not been observed even under high pressure, it seems of great interest to explore other materials with the same type of triangular lattice, including non-Co oxides, and investigate their transport, magnetic, and thermal properties.…”

Section: Discussionmentioning

confidence: 99%

Physical properties of the misfit-layered (Bi,Pb)-Sr-Co-O system: Effect of hole doping into a triangular lattice formed by low-spin Co ions

2002

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Pb-doping effect on physical properties of misfit-layered ͑Bi,Pb͒-Sr-Co-O system, in which Co ions form a two-dimensional triangular lattice, was investigated in detail by electronic transport, magnetization and, specific-heat measurements. Pb doping enhances the metallic behavior, suggesting that carriers are doped. Pb doping also enhances the magnetic correlation in this system and increases the magnetic transition temperature. We found the existence of the short-range magnetic correlation far above the transition temperature, which seems to induce the spin-glass state coexisting with the ferromagnetic long-range order at low temperatures. Specific-heat measurement suggests that the effective mass of the carrier in ͑Bi,Pb͒-Sr-Co-O is not enhanced so much as reported in NaCo 2 O 4 . Based on these experimental results, we propose a two-band model that consists of narrow a 1g and rather broad e g Ј bands. The observed magnetic property and magnetotransport phenomena are explained well by this model. FIG. 1. ͑a͒ A schematic picture of the crystal structure of Bi-Sr-Co-O. ͑b͒ A projected view of hexagonal CoO 2 layer into the a-b plane.

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“…Samples, grown as described in ref. [5], were mounted on a liquid He cryostat and cleaved in situ in the ultra-high vacuum chamber with base pressure 2-3×10 -9 Pa. are measured on a sample from the same batch.…”

Section: For Layered Metals Equation (1) Formally Means That Once Thmentioning

confidence: 99%

Coherence–incoherence and dimensional crossover in layered strongly correlated metals

Valla

Johnson

Yusof

et al. 2002

Nature

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188

155

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The properties of an interacting electron system depend on the electron correlations and the effective dimensionality. For example, Coulomb repulsion between electrons may inhibit, or completely block, conduction by intersite electron hopping, thereby determining whether a material is a metal or an insulator. Furthermore, correlation effects increase as the number of effective dimensions decreases; in three-dimensional systems, the low-energy electronic states behave as quasiparticles, whereas in one-dimensional systems, even weak interactions break the quasiparticles into collective excitations. Dimensionality is particularly important for exotic low-dimensional materials where one- or two-dimensional building blocks are loosely connected into a three-dimensional whole. Here we examine two such layered metallic systems with angle-resolved photoemission spectroscopy and electronic transport measurements, and we find a crossover in the number of effective dimensions from two to three with decreasing temperature. This is apparent from the observation that, in the direction perpendicular to the layers, the materials have an insulating character at high temperatures but become metal-like at low temperatures, whereas transport within the layers remains metallic over the whole temperature range. We propose that this change in effective dimensionality correlates with the presence of coherent quasiparticles within the layers.

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Enhancement of metallic behavior in bismuth cobaltates through lead doping

Cited by 19 publications

References 22 publications

Large Magneto-piezoelectric Effect in EuMnBi2 Single Crystal at Low Temperatures

Large Magneto-piezoelectric Effect in EuMnBi2 Single Crystal at Low Temperatures

Physical properties of the misfit-layered (Bi,Pb)-Sr-Co-O system: Effect of hole doping into a triangular lattice formed by low-spin Co ions

Coherence–incoherence and dimensional crossover in layered strongly correlated metals

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