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Atomic structure at the nanoscale a 21st century materials challenge
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R. Endoh et al.,

PRB 68, 115106 (2003).

HIGHLIGHT

Slide 34

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays

0.5s

1s

30s

0.5s

MAR345 exposures: 0.5s, 1s, 30s,

~2 minute break in exposing, 0.5s

HIGHLIGHT

Slide 35

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays

0.5s

1s

30s

0.5s

MAR345 exposures: 0.5s, 1s, 30s,

~2 minute break in exposing, 0.5s

HIGHLIGHT

Slide 36

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays

0.5s

1s

30s

0.5s

MAR345 exposures: 0.5s, 1s, 30s,

~2 minute break in exposing, 0.5s

HIGHLIGHT

Slide 37

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays

0.5s

1s

30s

0.5s

MAR345 exposures: 0.5s, 1s, 30s,

~2 minute break in exposing, 0.5s

HIGHLIGHT

Slide 38

30s

30s

0.5s

Melting observed in present study is approximately order of magnitude “faster” than that in the earlier reports

H. Ishibashi et al., PRB 66, 144424 (2002).

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays

HIGHLIGHT

Slide 39

15s

15s

30s

0.5s

Cumulative

Data

Collection

exposure

collection

Continuous

Exposure

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays – local aspects

HIGHLIGHT

Slide 40

15s

15s

30s

0.5s

Collection: 250 msec snapshot

Exposure: continuous 23 sec

Snapshot

Data

Collection

exposure

collection

23 sec

Differences due to statistics only,

the underlying local structures are the same!

CuIr2S4: Melting the long range ordered dimerization pattern by x-rays – local aspects

HIGHLIGHT

Slide 41

Diffraction

Diffraction

patterns

(long range order)

PDF

profiles

(short range order)

Temperature

Doping

Irradiation

CuIr2S4: Melting the long range ordered dimerization pattern – overview

HIGHLIGHT

Slide 42

CuIr2S4 thiospinel: Summary

CuIr2S4 thiospinel: Summary

Do the dimers survive locally when the long range order is removed by:

1. Temperature: NO: the local dimers are destroyed

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