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QED3 Phase Diagram. Courtesy of N.P. Ong. Nernst Effect in HTS. Vortex fluctuations in the pseudogap state !!. BiSrCaCuO. Z. A. Xu et al., Nature 406 , 486 (2000). HTS are Nodal d-wave Superconductors (Phase sensitive exps., ARPES, FT-STS, etc.). Tsuei & Kirtley, 1997.

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Nernst effect in hts

Courtesy of N.P. Ong

Nernst Effect in HTS

Vortex fluctuations in the

pseudogap state !!

BiSrCaCuO

Z. A. Xu et al., Nature 406, 486 (2000)


HTS are Nodal d-wave Superconductors

(Phase sensitive exps., ARPES, FT-STS, etc.)

Tsuei &

Kirtley, 1997

FT-STS measured D

ARPES D(q), Mesot -PRL 83,840 (1999)

FT-STS from

Davis’ group,

Nature 422, 520 (2003).

Courtesy of J.C. Davis


“Electron Crystal” in Underdoped Cuprates M. Vershinin et al., Science 303, 1995 (2004); T. Hanaguri, C. Lupien et al., Nature 430, 1001 (2004)

Underdoped Ca2-xNaxCuO2Cl2

x=0.08 (I), 0.10 (SC), 0.12 (SC)

Courtesy of J.C. Davis


150 pS

35 pS

Courtesy of A. Yazdani

Pseudogap State

K-Space

100K

Modulation along the Cu-O bond direction

500Å x 200 Å

Cu-O

Vershinin et al.Science 303, 1995 (2004)


Hofstadter butterfly and cooper pair density wave in hts

“Electron Crystal” in HTS

(Vershinin, et al.,

Hanaguri, Lupien, et al.)

Hofstadter Butterfly and Cooper Pair Density Wave in HTS

Hofstadter “Butterfly” Spectrum

Dual theory supplies the connection

between two phenomena. It leads to

Hofstadter “magic fractions” f = p/q

for Cooper pair CDW at special x:

f = p/q = (1-x)/2 !!


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