Atomic structure at the nanoscale a 21st century materials challenge

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R. Endoh et al.,

PRB 68, 115106 (2003).

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Slide 34

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

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Slide 35

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

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Slide 36

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

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Slide 37

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

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Slide 38

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

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Slide 39

15s

30s

0.5s

Cumulative

Data

Collection

exposure

collection

Continuous

Exposure

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

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Slide 40

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

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Slide 41

Diffraction

patterns

(long range order)

PDF

profiles

(short range order)

Temperature

Doping

Irradiation

CuIr2S4: Melting the long range ordered dimerization pattern – overview

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Slide 42

CuIr2S4 thiospinel: Summary

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

1. Temperature: NO: the local dimers are destroyed