Emergence of preformed Cooper pairs from the doped Mott insulating state in Bi2Sr2CaCu2O8+δ

被引：200

作者：

Yang, H. -B. ^{[1
]}

Rameau, J. D. ^{[1
]}

Johnson, P. D. ^{[1
]}

Valla, T. ^{[1
]}

Tsvelik, A. ^{[1
]}

Gu, G. D. ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

来源：

NATURE | 2008年 / 456卷 / 7218期

关键词：

D O I：

10.1038/nature07400

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Superconductors are characterized by an energy gap that represents the energy needed to break the pairs of electrons (Cooper pairs) apart. At temperatures considerably above those associated with superconductivity, the high- transition- temperature copper oxides have an additional 'pseudogap'. It has been unclear whether this represents preformed pairs of electrons that have not achieved the coherence necessary for superconductivity, or whether it reflects some alternative ground state that competes with superconductivity(1). Paired electrons should display particle - hole symmetry with respect to the Fermi level (the energy of the highest occupied level in the electronic system), but competing states(2-4) need not show such symmetry. Here we report a photoemission study of the underdoped copper oxide Bi2Sr2CaCu2O8+delta that shows the opening of a symmetric gap only in the anti-nodal region, contrary to the expectation that pairing would take place in the nodal region. It is therefore evident that the pseudogap does reflect the formation of preformed pairs of electrons and that the pairing occurs only in well- defined directions of the underlying lattice.

引用

页码：77 / 80

页数：4

共 25 条

[1] Angle-resolved photoemission spectra in the cuprates from the d-density wave theory -: art. no. 100504 [J].

Chakravarty, S ;

Nayak, C ;

Tewari, S .

PHYSICAL REVIEW B, 2003, 68 (10)

[2] Hidden order in the cuprates [J].

Chakravarty, S ;

Laughlin, RB ;

Morr, DK ;

Nayak, C .

PHYSICAL REVIEW B, 2001, 63 (09)

[3] Angle-resolved photoemission studies of the cuprate superconductors [J].

Damascelli, A ;

Hussain, Z ;

Shen, ZX .

REVIEWS OF MODERN PHYSICS, 2003, 75 (02) :473-541

[4] Spin-gap proximity effect mechanism of high-temperature superconductivity [J].

Emery, VJ ;

Kivelson, SA ;

Zachar, O .

PHYSICAL REVIEW B, 1997, 56 (10) :6120-6147

[5] Photoemission above the Fermi level: The top of the minority d band in nickel [J].

Greber, T ;

Kreutz, TJ ;

Osterwalder, J .

PHYSICAL REVIEW LETTERS, 1997, 79 (22) :4465-4468

[6] Evolution of the pseudogap from Fermi arcs to the nodal liquid [J].

Kanigel, A. ;

Norman, M. R. ;

Randeria, M. ;

Chatterjee, U. ;

Souma, S. ;

Kaminski, A. ;

Fretwell, H. M. ;

Rosenkranz, S. ;

Shi, M. ;

Sato, T. ;

Takahashi, T. ;

Li, Z. Z. ;

Raffy, H. ;

Kadowaki, K. ;

Hinks, D. ;

Ozyuzer, L. ;

Campuzano, J. C. .

NATURE PHYSICS, 2006, 2 (07) :447-451

[7] EVIDENCE FOR THE HIGH-SPIN TO LOW-SPIN STATE TRANSITION IN ORDERED FE3PT INVAR [J].

KISKER, E ;

WASSERMANN, EF ;

CARBONE, C .

PHYSICAL REVIEW LETTERS, 1987, 58 (17) :1784-1787

[8] Doped spin liquid: Luttinger sum rule and low temperature order [J].

Konik, RM ;

Rice, TM ;

Tsvelik, AM .

PHYSICAL REVIEW LETTERS, 2006, 96 (08)

[9] Abrupt onset of a second energy gap at the superconducting transition of underdoped Bi2212 [J].

Lee, W. S. ;

Vishik, I. M. ;

Tanaka, K. ;

Lu, D. H. ;

Sasagawa, T. ;

Nagaosa, N. ;

Devereaux, T. P. ;

Hussain, Z. ;

Shen, Z.-X. .

NATURE, 2007, 450 (7166) :81-84

[10] ITERATIVE TECHNIQUE FOR RECTIFICATION OF OBSERVED DISTRIBUTIONS [J].

LUCY, LB .

ASTRONOMICAL JOURNAL, 1974, 79 (06) :745-754

← 1 2 3 →