EXAFS observation of two distinct Bi–O distances below Tc for a Ba0.6K0.4BiO3 single crystal

Kim, B.J.; Kim, Y.C.; Kim, Hyun-Tak; Kang, Kwang‐Yong; Lee, J.M.

doi:10.1016/s0921-4534(03)00935-3

Cited by 10 publications

(17 citation statements)

References 25 publications

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“…The peak at ≈ 1.8Å dominates. It denotes the nearest neighbour Bi-O distance and its position stays in agreement with FT EXAFS spectra for other alloys and compounds [8][9][10]. The same peak, but with smaller amplitude, is clearly visible also for the [CoCiBi]×5 sample after decomposition of the FT EXAFS signal.…”

Section: Methodssupporting

confidence: 74%

XAFS Studies of the Behaviour of Bi in Co/Cu Multilayers

et al. 2009

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The atomic environment of Bi atoms in the Co/Cu multilayered system was studied with X-ray absorption fine structure spectroscopy. Experiments were carried out on a Co(1 nm)/Cu(2 nm) system with 5 and 10 repetitions of Co/Cu evaporated with very low deposition rate in ultrahigh vacuum. A very small amount of Bi (0.06 nm) was deposited on each Cu film in the system. The X-ray absorption fine structure spectra were measured at the BiL 3 edge in the X-ray absorption near-edge structure and extended X-ray absorption fine structure ranges at the Beamline X1 of HASYLAB/DESY synchrotron laboratory in Hamburg. The experimental data showed different local neighbourhood of Bi, depending on the number of Co/Cu bilayer repetitions. The results are discussed in terms of the location and segregation of the Bi atoms as well as its possible oxidation ways.

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Section: Methodssupporting

confidence: 74%

XAFS Studies of the Behaviour of Bi in Co/Cu Multilayers

et al. 2009

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“…EXAFS and XANES [35][36][37] provide direct evidence for the amplitude of periodic lattice distortion (PLD) beeing fast probes sensitive to short range lattice structural order. Because of these features EXAFS and XANES [39][40] have been succesfully used to probe short range CDW in a variety of compounds [42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. Tuning the photon energy at the Cu K-edge [38,39] and at the Cu L 3 edge [41] of cuprates it has been possibile to detect resonant X-ray diffraction (XRD) due to displacenents of selected atomic species obtaining direct evidence of CDW in cuprates [57][58][59][60][61].…”

Section: Introductionmentioning

confidence: 99%

CDW and Similarity of the Mott Insulator-to-Metal Transition in Cuprates with the Gas-to-Liquid-Liquid Transition in Supercooled Water

Campi

Innocenti

Bianconi

2015

J Supercond Nov Magn

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New advances in x-ray diffraction, extended x-ray absorption fine structure EXAFS and xray absorption near edge structure XANES using synchrotron radiation have now provided compelling evidence for a short range charge density wave phase (CDW) called "striped phase" in the CuO 2 plane of all cuprate high temperature superconductors. The CDW is associated with a bond order wave (BOW) and an orbital density wave (ODW) forming nanoscale puddles which coexist with superconducting puddles below Tc. The electronic CDW crystalline phase occurs around the hole doping 0.125 between the Mott charge transfer insulator, and the 2D metal. The Van der Waals (VdW) theoretical model for a liquid of anisotropic extended objects proposed for supercooled water is used to describe : a) the underdoped regime as a first spinodal regime of a "slightly doped charge transfer Mott insulator puddles coexisting with the striped polaronic CDW puddles; and b) the optimum doping regime as a second spinodal regime where striped polaronic CDW puddles coexist with the normal 2D metal puddles. This complex phase separation with 3 competing phases depends on the strength of the anisotropic electron-phonon interaction that favors the formation striped polaronic CDW phase.

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“…[7]). To describe the tachyon kink solutions we assume that the tachyon and gauge field strengths depend only on one spatial direction, x,…”

Section: Tachyon Kinks In Flat Spacementioning

confidence: 99%

“…In flat space, the obtained static kink configurations for pure tachyon fields are either singular solutions [4] or an array of regular kink-anti-kink [5,6,7]. Once constant DBI-type electromagnetic fields are turned on, there are additional five non-trivial regular solutions.…”

Section: Introductionmentioning

confidence: 99%

BPS D-branes from an Unstable D-brane

Kim¹

2005

AIP Conference Proceedings

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Abstract.We search for exact tachyon kink solutions of DBI type effective action describing an unstable D-brane with worldvolume gauge field turned in both the flat and a curved background. There are various kinds of solutions in the presence of electromagnetic fields in the flat space, such as periodic arrays, topological tachyon kinks, half kinks, and bounces. We identify a BPS object, D(p-1)F1 bound state, which describes a thick brane with string flux density. The curved background of interest is the ten-dimensional lift of the Salam-Sezgin vacuum and, in the asymptotic limit, it approaches R 1,4 × T 2 × S 3 . The solutions in the curved background are identified as composites of lower-dimensional D-branes and fundamental strings, and, in the BPS limit, they become a D4D2F1 composite wrapped on R 1,2 × T 2 where T 2 is inside S 3 .

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EXAFS observation of two distinct Bi–O distances below Tc for a Ba0.6K0.4BiO3 single crystal

Cited by 10 publications

References 25 publications

XAFS Studies of the Behaviour of Bi in Co/Cu Multilayers

XAFS Studies of the Behaviour of Bi in Co/Cu Multilayers

CDW and Similarity of the Mott Insulator-to-Metal Transition in Cuprates with the Gas-to-Liquid-Liquid Transition in Supercooled Water

BPS D-branes from an Unstable D-brane

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