ARPES features of the AF insulators Sr2CuO2Cl2 and Ca2CuO2Cl2 close to the AF zone boundary

Ronning, F.; Kim, C.; Damascelli, A.; Armitage, N. P.; Lü, Donghui; Shen, Kyle; Miller, L. L.; Kim, Y.J.; Kastner, M. A.; Birgeneau, R. J.; Shen, Zhi‐Xun

doi:10.1016/s0921-4534(00)01090-x

Cited by 3 publications

(7 citation statements)

References 16 publications

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“…9 for comparison. Here we remark that experimental data [34,35] of n r k seem to be photon-energy dependent, indicating the effect of the electron-photon matrix element, and there also exits controversies [34,35] on whether the "remnant Fermi surface" defined near the sharpest drop of n r k in k-space is meaningful or not. But in the present approach the momentum dependence of n r k does not represent any real Fermi surface structure of the Mott antiferromagnet at half-filling.…”

Section: Conclusion and Discussionmentioning

confidence: 90%

Spin-charge separation in the single-hole-doped Mott antiferromagnet

2001

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The motion of a single hole in a Mott antiferromagnet is investigated based on the t − J model. An exact expression of the energy spectrum is obtained, in which the irreparable phase string effect [Phys. Rev. Lett. 77, 5102 (1996)] is explicitly present. By identifying the phase string effect with spin backflow, we point out that spin-charge separation must exist in such a system: the doped hole has to decay into a neutral spinon and a spinless holon, together with the phase string. We show that while the spinon remains coherent, the holon motion is deterred by the phase string, resulting in its localization in space. We calculate the electron spectral function which explains the line shape of the spectral function as well as the "quasiparticle" spectrum observed in angle-resolved photoemission experiments. Other analytic and numerical approaches are discussed based on the present framework. 71.27.+a, 74.20.Mn,

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Section: Conclusion and Discussionmentioning

confidence: 90%

Spin-charge separation in the single-hole-doped Mott antiferromagnet

2001

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“…The physical picture of the antiferromagnetic (SDW) insulator as a phase-disordered d-wave superconductor is further supported by the ARPES data on the insulating Ca 2 CuO 2 Cl 2 and Sr 2 CuO 2 Cl 2 [8], [9]. These experiments show two unexpected features of the insulating state: 1) although the ARPES spectral function is broad, one can nevertheless identify a remnant of the Fermi surface, 2) the dispersion at such an approximate "Fermi surface" has a d-wave form, except that it becomes rounded and without the characteristic cusp at low energies.…”

Section: Introductionmentioning

confidence: 83%

“…where U = diag{e −iφA , e iφB , e −iφA , e iφB }. Since any given vortex defect is either in group A or B, and therefore associated either with up, or with down spin by the transformation (9), circling around it with the transformed fermion would yield either 2π or zero of the accumulated phase change. Components of the new field Ψ are therefore single-valued functions.…”

Section: Coupling To Topological Defectsmentioning

confidence: 99%

“…This simplicity suggests that an inverted approach to the high-T c problem may be more natural [7]: if there exists a d-wave state in the phase diagram, which other states can in principle be inferred from it? The purpose of this paper is to establish the theoretical framework for answering this question, answer it, and show how this may help explain some salient features of the cuprates phase diagram and the angle resolved photo emission spectroscopy (ARPES) experiments in the insulating state [8], [9].…”

Section: Introductionmentioning

confidence: 99%

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QED3theory of underdoped high-temperature superconductors

2002

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Q E D 3 theory of underdoped high tem perature superconductors Igor F.H erbut D epartm ent ofPhysics,Sim on Fraser U niversity,B urnaby,B ritish C ol um bia, C anada V 5A 1S6T he l ow -energy theory ofd-w ave quasi parti cl es coupl ed to uctuati ng vortex l oopsthatdescri besthel ossofphase coherence i n a tw o di m ensi onald-w ave superconductor at T = 0 i s deri ved from rst pri nci pl es. T he theory has the form of2+ 1 di m ensi onal quantum el ectrodynam i cs (Q E D 3), and i s proposed asan e ecti ve descri pti on ofthe T = 0 superconductori nsul ator transi ti on and of the pseudogap phase i n underdoped cuprates. T he coupl i ng constant ("charge") i n thi s theory i s proporti onalto the dualorder param eter ofthe X Y m odel ,w hi ch i s assum ed to be descri bi ng uctuati ons ofthe phase ofthe superconducti ng order param eter. Fi ni teness of the charge i s then tantam ount to the appearance ofi n ni tel y l arge vortex l oops, i . e. to the l oss of phase coherence i n the system . T he pri nci palresul t i s thatthe destructi on ofsuperconducti ng phasecoherencei n thed-w avesuperconductors typi cal l y,and i m m edi atel y,l eadsto the appearance ofanti ferrom agneti sm . T hi s transi ti on can be understood i n term s of the spontaneous breaki ng ofan approxi m ate "chi ral " SUc(2) sym m etry, w hi ch m ay be di scerned at l ow enough energi es i n the standard d-w ave superconductor. T he m echani sm of thi s spontaneous sym m etry breaki ng i s form al l y anal ogous to the dynam i cal m ass generati on i n the Q E D 3, w i th the "m ass" here bei ng proporti onal to staggered m agneti zati on. O ther phases w i th broken chi ralsym m etry i ncl ude the transl ati onal l y i nvari ant "d+ i p" and "d+ i s" i nsul ators, and the one-di m ensi onalcharge-densi ty and spi n-densi ty w aves,w hi ch are al li nsul ati ng descendants ofthe d-w ave superconductor. A l lthe i nsul ati ng states have the neutralspi n-1=2 exci tati ons that one can i denti fy i n the superconductor con ned by the l ogari thm i c potenti al . El ectron repul si on i s i n thi s form ali sm represented by a parti cul ar quarti c perturbati on to the Q E D 3 acti on,w hi ch breaks the chi ralsym m etry and sel ects the anti ferrom agnet as the preferred broken sym m etry state. Iform ul ate the m ean-el d theory ofthe anti ferrom agneti c i nstabi l i ty i n presenceofa short-rangerepul si vei nteracti on,and nd the staggered m agneti zati on to be si gni cantl y enhanced deeperi nsi de the i nsul ati ng state. T he theory o ersan expl anati on for the rounded d-w ave-l i ke di spersi on seen i n A R PES experi m ents on the i nsul ati ng C a2C uO 2 C l2 (F.R onni ng et. al .,Sci ence 282,2067 (1998). ) R el ati ons to other theoreti cal approaches to the hi gh-Tc probl em are di scussed.

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“…Oxychloride cuprates have received considerable interests by physicists as ideal two dimensional model compounds of HTS. For instance, recently series experiments of angle resolved photoemission spectroscopy (ARPES) have been conducted on the 0201 type oxychloride cuprates [5][6][7]. More recently an antiferromagnetism and hole pair checkerboard model was theoretically proposed to understand the possible evolution from a Mott insulator to a superconducting regime with increasing carrier doping in HTS [8].…”

Section: Introductionmentioning

confidence: 99%

High pressure synthesis of a new superconductor Sr2CuO2+δCl2−y induced by “apical oxygen doping”

Liu

Qin

et al. 2005

Physica C: Superconductivity and its Applications

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Using the apical oxygen doping mechanism, i.e. a partial substitution of divalence O for the monovalence Cl, a p-type oxychloride cuprate superconductor, Sr 2 CuO 2+ Cl 2-y , was synthesized at high pressure high temperature. The x-ray diffraction refinement suggests the superconductor crystallizes into a 0201 structure with space group I4/mmm and lattice parameters being a=3.92Å, c=15.6 Å. The magnetic susceptibility as well as resistance measurements indicated that the bulk superconductivity with transition temperature (T c ) 30K was achieved in the sample.

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ARPES features of the AF insulators Sr2CuO2Cl2 and Ca2CuO2Cl2 close to the AF zone boundary

Cited by 3 publications

References 16 publications

Spin-charge separation in the single-hole-doped Mott antiferromagnet

Spin-charge separation in the single-hole-doped Mott antiferromagnet

QED3theory of underdoped high-temperature superconductors

High pressure synthesis of a new superconductor Sr2CuO2+δCl2−y induced by “apical oxygen doping”

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