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a simple superconductor?

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FeSe<br />

A key observation is that the clean<br />

superconducting phase exists only<br />

in those samples prepared with<br />

intentional Se deficiency.<br />

• A small magnetic anomaly is<br />

observed at 105 K, which is more<br />

pronounced in the FC<br />

measurements.<br />

• Inset shows the magnetic<br />

hysteresis of the sample<br />

measured at 2 K. It confirms the<br />

superconducting characteristic of<br />

the sample.<br />

ICMR Summer School on Novel Superconductors 2009

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