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Internal pressure in superconducting Cu intercalated Bi₂Se₃

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arxiv 1601.06954 v1 pith:7J2LJ25T submitted 2016-01-26 cond-mat.supr-con cond-mat.str-el

Internal pressure in superconducting Cu intercalated Bi₂Se₃

Amit Ribak , Khanan B. Chashka , Elias Lahoud , Muntaser Naamneh , Shahar Rinott , Yair Ein-Eli , Nicholas C. Plumb , Ming Shi
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Emile Rienks Amit Kanigel
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classification cond-mat.supr-con cond-mat.str-el
keywords internalband-structureintercalatedpressuresuperconductingangle-resolvedband-gapcalculations
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Angle-resolved photoemission spectroscopy is used to study the band-structure of superconducting electrochemically intercalated Cu$_x$Bi$_2$Se$_3$. We find that in these samples the band-gap at the $\Gamma$ point is much larger than in pristine Bi$_2$Se$_3$. Comparison to the results of band-structure calculations indicates that the origin of this large gap is internal stress caused by disorder created by the Cu intercalation. We suggest that the internal pressure may be necessary for superconductivity in Cu$_x$Bi$_2$Se$_3$.

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