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Spin-charge gauge theory of "pseudogap": Theory versus experiments
Marchetti, PA; Su, ZB; Yu, L
2003
Conference Name4th International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials
Source PublicationINTERNATIONAL JOURNAL OF MODERN PHYSICS B
Volume17
Issue18-20
Pages3359-3362
Conference DateJAN 16-21, 2003
Conference PlaceSAN DIEGO, CALIFORNIA
Publication PlaceSINGAPORE
ISSN0217-9792
PublisherWORLD SCIENTIFIC PUBL CO PTE LTD
AbstractWe propose an explanation of several experimental features related to the "pseudogap" in high T-c cuprates in terms of a spin-charge gauge theory. In this approach, based on a formal spin-charge separation applied to the t-J model, the low energy effective action describes gapful spinons (with a theoretically derived doping dependence of the gap m(s) similar to J(delta\ ln delta\(1/2), where delta is the doping concentration) and holons with "small" Fermi surface (epsilon(F) similar to tdelta) interacting via a gauge field. The main effect of gauge fluctuations is to introduce a dissipation similar toT/chi, where chi is the diamagnetic susceptibility. The competition between the two energy scales, m(s) and T/chi, is the root in our approach of many phenomena peculiar to in-plane transport properties of the "pseudogap phase". Furthermore the gauge interaction induces binding of spinon and holon into an "electron" resonance. This binding introduces another energy scale, the recombination rate, which dominates the out-of-plane resistivity, yielding an insulating behavior. A good agreement is found between the experimental data and theoretically derived doping and temperature dependence of resistivity, both in-plane and out-of-plane, and spin relaxation.
KeywordT-J MODEL NORMAL-STATE CUPRATE SUPERCONDUCTORS LA2-XSRXCUO4 RESISTIVITY BOSONIZATION FERMIONS FIELDS
DOI10.1142/S0217979203020983
URL查看原文
Indexed ByCPCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Applied ; Physics, Condensed Matter ; Physics, Mathematical
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Document Type会议论文
Identifierhttp://ir.itp.ac.cn/handle/311006/23728
CollectionSCI会议论文
Affiliation1.Dept Phys, I-35131 Padua, Italy
2.Ist Nazl Fis Nucl, I-35131 Padua, Italy
3.Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Marchetti, PA,Su, ZB,Yu, L. Spin-charge gauge theory of "pseudogap": Theory versus experiments[C]. SINGAPORE:WORLD SCIENTIFIC PUBL CO PTE LTD,2003:3359-3362.
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