Strain amplification of the 4k chain instability in Sr Cu O
Strain amplification of the 4k chain instability in Sr Cu O
Strain amplification of the 4k chain instability in Sr Cu O
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<strong>Sr</strong> 14-x Ca x <strong>Cu</strong> 24 O 41 (SCCO)<br />
Fukuda, PRB, 66, 12104 (2002)<br />
• Cha<strong>in</strong>s buckle to accommodate ladder:<br />
c ≈ 7c L ≈ 10c c<br />
1<br />
c = 27.3 Å<br />
• <strong>Sr</strong> 2+ , O 2– ⇒ <strong>Cu</strong> 2.25+<br />
isoelectronic to perovskite cuprates<br />
• 6 holes / formula unit. Most are <strong>in</strong> <strong>the</strong><br />
<strong>cha<strong>in</strong></strong>. 3<br />
• Conductivity governed by ladders 2<br />
<strong>Cu</strong>O 2<br />
<strong>Cu</strong> 2<br />
O 3<br />
• Sp<strong>in</strong> gap at all temperatures 4 : Pair<strong>in</strong>g<br />
1 Etrillard, Physica C, 403, 290 (2004); Braden, PRB, 69, 214426 (2004)<br />
2<br />
Osafune, PRL, 78, 1980 (1997)<br />
3 Nücker, PRB, 62, 14384 (2000); Piskunov, PRB, 72, 064512 (2005); Rusydi, PRB, 75, 10450 (2007)<br />
4 Carter, PRL., 77, 1378 (1996); Takigawa, PRB, 57, 1124 (1998); Matsuda, PRB, 56, 14499 (1997)
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