Out-of-Plane Sulfur Distortions in the Bi4O4S3 Superconductor

The local atomic structure of the non-magnetic layered superconductor Bi4O4S3 was investigated using neutron diffraction and pair density function (PDF) analysis. Although on average, the crystal structure is well ordered, evidence for local, out–of–plane sulfur distortions is provided, which may act as a conduit for charge transfer from the SO4 blocks into the superconducting BiS2 planes. In contrast with LaO1−xFxBiS2, no sulfur distortions were detected in the planes, which indicates that charge density wave fluctuations are not supported in Bi4O4S3.

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Phase Transitions in Al87Ni7Nd6

MRS Proceedings ◽

10.1557/proc-806-mm9.2 ◽

2003 ◽

Vol 806 ◽

Author(s):

Despina Louca ◽

K. Ahn ◽

A. K. Soper ◽

S. J. Poon ◽

G. J. Shiflet

Keyword(s):

Phase Transitions ◽

Neutron Diffraction ◽

Metallic Glass ◽

Atomic Structure ◽

Crystalline Phase ◽

Room Temperature ◽

Local Environment ◽

Pair Density ◽

Pdf Analysis ◽

Increasing Temperature

ABSTRACTThe local atomic structure of Al87Ni7Nd6 amorphous metallic glass was determined upon heating by neutron diffraction and the pair density function (PDF) analysis. Two isotopes of Ni with very different scattering intensities were used (58Ni and 60Ni) to separate the local environment of the transition metal. A distinct pre-peak observed in reciprocal space arises because of chemical clustering of Ni atoms. With increasing temperature the coherence length of this peak increases indicating an enhancement in atomic clustering. In addition, precipitation of Al metal is first observed at 200 °C with heating. Binary and ternary Al phases form as the temperature increases further to 500 °C although the majority crystalline phase is Al. The local atomic topology at the intermediate temperatures can be represented with a model that is a combination of the atomic structure at room temperature plus Al.

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A study of the magnetoresistance of the charge-transfer salt at hydrostatic pressures of up to 20 kbar: evidence for a charge-density-wave ground state and the observation of pressure-induced superconductivity

Journal of Physics Condensed Matter ◽

10.1088/0953-8984/8/33/009 ◽

1996 ◽

Vol 8 (33) ◽

pp. 6005-6017 ◽

Cited By ~ 25

Author(s):

W Lubczynski ◽

S V Demishev ◽

J Singleton ◽

J M Caulfield ◽

L du Croo de Jongh ◽

...

Keyword(s):

Charge Transfer ◽

Charge Density ◽

Ground State ◽

Charge Density Wave ◽

Density Wave ◽

A Charge

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X-ray diffuse scattering as precursor of incommensurate Peierls transitions in one-dimensional organic charge transfer conductors

Zeitschrift für Kristallographie - Crystalline Materials ◽

10.1524/zkri.219.11.711.52440 ◽

2004 ◽

Vol 219 (11) ◽

Cited By ~ 10

Author(s):

Jean-Paul Pouget

Keyword(s):

Charge Transfer ◽

Charge Density Wave ◽

Diffuse Scattering ◽

Lattice Distortion ◽

Density Wave ◽

Periodic Lattice ◽

One Dimensional ◽

X Ray ◽

Charge Transfer Salts ◽

A Charge

AbstractQuasi-one dimensional (1D) conductors of the TTF-TCNQ family of charge transfer salts exhibit a Peierls transition which stabilizes a periodic lattice distortion (PLD), accompanied by a charge density wave (CDW) modulation, with an incommensurate 2

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