Reversible structural phase transition of BaPb0.75Bi0.25O3.00 around 360°C

Hashimoto, Takuya; Harayama, Eiji; Hirasawa, Ryo; Hirai, Hidefumi; Yoshida, Toshikazu; Yonemura, Yuki; Tanaka, Hideki; Tagawa, Hiroaki; Mizusaki, Junichiro

doi:10.1016/0921-4534(95)00157-3

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…The structural parameters of the samples are in a good agreement with the data published in Ref. 24 for BaPb 1−x Bi x O 3−δ with a small oxygen deficiency, δ.…”

Section: Methodssupporting

confidence: 79%

207Pband17ONMR study of the electron density distribution in the metallic phase o

et al. 2002

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The 17 O and 207 Pb NMR spectra were measured in ceramic samples in the metallic phase of BaPb1−xBixO3 oxides (0 < x ≤ 0.33). The inhomogeneous magnetic broadening which appears due to a distribution of the Knight shifts was analyzed in detail. It is shown that Bi atoms, which are randomly incorporated in BaPbO3 parent compound give rise to an increased conduction electron spin density within an area which is delimited by its two first cation shells. According to NMR data the percolative overlap of these areas occurs in superconducting compositions and it is accompanied by a sharp growth of the average Knight shift < Ks >. The decrease of < 17 Ks > with temperature revealed for x = 0.33 evidences for an opening of the energy gap near EF near the metal-semiconductor transition (x = 0.35).

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“…The structural parameters of the samples are in a good agreement with the data published in Ref. 24 for BaPb 1−x Bi x O 3−δ with a small oxygen deficiency, δ.…”

Section: Methodssupporting

confidence: 79%

207Pband17ONMR study of the electron density distribution in the metallic phase o

et al. 2002

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“…Partial gapping and/or CDWs were also observed in BaPb 1−x Bi x O 3 , both for non-superconducting and superconducting compositions, by resistivity measurements [98,103,162,164,279], C P [98,102,237], optical reflection spectra [280][281][282][283], thermoelectric power [284] (here the coexistence between delocalized and localized electrons made itself evident) and extended x-ray absorption finestructure (EXAFS) [285,286], where the inequivalence between different Bi ions is readily seen from pair-distribution functions.…”

Section: Cdw Superconductorsmentioning

confidence: 99%

Charge- and spin-density-wave superconductors

Gabovich

Войтенко

Annett

et al. 2001

Supercond. Sci. Technol.

171

147

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This review deals with the properties of superconductors with competing electron spectrum instabilities, namely, charge-density waves (CDWs) and spin-density waves (SDWs). The underlying reasons of the electron spectrum instability may be either Fermi surface nesting or the existence of Van Hove saddle points for lower dimensionalities. CDW superconductors include layered dichalcogenides, NbSe 3 , and compounds with the A15 and C15 structures among others. There is much evidence to show that high-T c oxides may also belong to this group of materials. The SDW superconductors include URu 2 Si 2 and related heavy-fermion compounds, Cr-Re alloys and organic superconductors. We review the experimental evidence for CDW and SDW instabilities in a wide range of different superconductors, and assess the competition between these instabilities of the Fermi surface and the superconducting gap. Issues concerning the superconducting order parameter symmetry are also touched upon. The accent is put on establishing a universal framework for further theoretical discussions and experimental investigations based on an extensive list of available and up-to-date references.

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“…Thus, in BaPb 1−y Bi y O 3 (BPB) for y 0.35 the electron spectrum 'dielectrization' is complete, and superconductivity is absent, whereas for y < 0.35 the electrical conductivity has a metallic character and superconductivity appears at T c = T c (y). Partial 'dielectrization' of the metallic state develops when y 0.15; this is proved by a number of anomalies in the BPB properties [8,15,46]. But the most direct evidence for the existence of the order parameter in BPB is provided by the light reflection spectra for the BPB ceramics [47].…”

Section: Discussionmentioning

confidence: 99%

Josephson tunnelling involving superconductors with charge-density waves

Gabovich

Войтенко

1997

J. Phys.: Condens. Matter

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The non-stationary Josephson (-), and quasiparticle (J-) currents through symmetrical and non-symmetrical tunnel junctions involving superconductors with charge-density waves were calculated. In both cases the voltage dependences of the currents have logarithmic singularities and jumps at positions determined by the non-trivial combinations of the superconducting, , and dielectric, , order parameters. The current J in non-symmetrical junctions is an asymmetrical function of the voltage, and depends on the sign of . For symmetrical junctions this current may be either symmetrical or not, depending on the relationship between the signs of the s on either side of the junction.

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Reversible structural phase transition of BaPb0.75Bi0.25O3.00 around 360°C

Cited by 3 publications

References 11 publications

207Pband17ONMR study of the electron density distribution in the metallic phase o

207Pband17ONMR study of the electron density distribution in the metallic phase o

Charge- and spin-density-wave superconductors

Josephson tunnelling involving superconductors with charge-density waves

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