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There are 13 papers published in subject: > since this site started. |
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1. A Method for Microscopic Modeling AC Josephson Effect | |||
LI Qiang | |||
Physics 03 February 2015 | |||
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Abstract:A method for microscopic modeling AC Josephson effect is provided. Microscopic studies based on the model reveal that electromagnetic radiation is due to two-boson time- dependent process. It is also revealed that generation of the double frequency components is due to the superconducting non-linear characteristics of the junction system. | |||
TO cite this article:LI Qiang. A Method for Microscopic Modeling AC Josephson Effect[OL].[ 3 February 2015] http://en.paper.edu.cn/en_releasepaper/content/4631565 |
2. Theoretical Studies of Microscopic Mechanisms of Flux Quantum and Superconducting and Normal Persistent Currents | |||
LI Qiang | |||
Physics 02 February 2015 | |||
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Abstract:Flux quantum corresponds to wave vector of the superconducting carrier electrons, which should be deep electrons of surface states. We provide a microscopic explanation to superconducting and normal persistent currents. The generation of persistent carrier electron does not dissipate energy; instead there would be emission of real phonons and release of corresponding energy into the environment; but the normal carrier electrons involved still dissipate energy. There should be a build-up of energy of the middle state C and a build-up of the probability of virtual transition of electrons to the middle state, and the corresponding relaxation should accordingly exist. | |||
TO cite this article:LI Qiang. Theoretical Studies of Microscopic Mechanisms of Flux Quantum and Superconducting and Normal Persistent Currents[OL].[ 2 February 2015] http://en.paper.edu.cn/en_releasepaper/content/4631562 |
3. Network structure of electron states in superconducting cuprates systems and its binding energy | |||
LI Qiang | |||
Physics 24 November 2012 | |||
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Abstract:A model of electron state structure of superconducting cuprates system is presented, in which network of criss-cross loops is identified and substantial tolerance to requirements on binding energy establishment is generated. Binding energy is not established and maintained in single pair of electrons. In fact, no edge in the network can always keep its binding energy, but every state/vertex in the network is always kept in a binding energy state; when a first edge loses its binding energy, a second edge connecting to the upper vertex of the first edge establishes its binding energy, and the overall binding energy of all edges in the network remains constant. Thus, electron interactions mediated by respective lattice modes enhance, rather than compete with, one another; the more edges are included in the network, the more likely binding energy is established/preserved. Significance of phonon depletion at nodal region in the model is discussed. | |||
TO cite this article:LI Qiang. Network structure of electron states in superconducting cuprates systems and its binding energy[OL].[24 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4498044 |
4. Pattern of electron pairing from node to antinode in Bi2212 superconducting system and underlying microscopic mechanism | |||
LI Qiang | |||
Physics 20 June 2012 | |||
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Abstract:If electronic states exist in the superconducting/pseudo gap, why don't electrons staying on the "Fermi Level" at the node jump to those states in the gap to enjoy the energy benefit of the gap? This question has now found an answer by consideration of pairing instability, which is measured by the phonon number of the mediating lattice mode responsible for the pairing concerned. We have obtained a full picture of electron pairing pattern in Bi2212 system, from node to antinode, in which the magnitude of gap is a measure of relative instability of electron pairing at the gap location. Bogoliubov quasiparticles are explained as excitations by, and means for dissipating, the phonons concentrated to the winning mode(s) in mode competition among mediating lattice modes. Superconducting gap is identified as a kinked band section. Some of the depleted modes in the mode competition should be responsible to high-temperature superconductivity. | |||
TO cite this article:LI Qiang. Pattern of electron pairing from node to antinode in Bi2212 superconducting system and underlying microscopic mechanism[OL].[20 June 2012] http://en.paper.edu.cn/en_releasepaper/content/4471387 |
5. Fe doped epitaxial YBCO films prepared by chemical solution deposition | |||
Zhang Hong,Wang Wentao,Zhao Yong | |||
Physics 05 January 2012 | |||
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Abstract:YBCO coated conductor has wide prospect in large scale application. But low current carrying capability restrain the practical application of YBCO coated conductor at high temperatures and high magnetic fields. Therefor, It is crucial for the preparation of theYBCO coated conductor with high critical current density. In this paper, epitaxial, dense, smooth and crack-free Fe doped YBCO films were prepared on LaAlO3 (LAO) single crystal substrate via a fluorine-free polymer-assisted metal organic deposition (PA-MOD) method. The effects of Fe doping on microstructure and superconducting character of YBCO films were investigated. The critical temperature for superconducting of the Fe doped YBCO film degrades slightly. However, In-field critical current density of YBCO films improves with this dilute Fe doping, except the doping quantity x = 0.005 compare to the pure YBCO film. Therefore, the current carring capability of YBCO film can improve through doping appropriate Fe in to the YBCO. It means that Fe doping in YBCO film may be a feasible way to prepare high performance conted conductor. | |||
TO cite this article:Zhang Hong,Wang Wentao,Zhao Yong. Fe doped epitaxial YBCO films prepared by chemical solution deposition[J]. |
6. Little-Parks-like effect in mesoscopic superconducting rings | |||
ZHA Guoqiao | |||
Physics 29 October 2011 | |||
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Abstract:The temperature T dependence of the superconducting state transition with applied magnetic flux Φ in small mesoscopic rings surrounded by a medium is investigated by the phenomenologicalGinzburg-Landau theory. The influences of the confinement effect and the effect of surface superconductivity on the Φ-T phase diagram are considered. With reducing the width of the ring arm, a Little-Parks-like oscillation for the superconducting/normal transition is found, which is similar to the recent experimental measurements. Furthermore, decreasing the ring size or the superconductivity near the surface leads to an intermittent superconducting transition for the Little-Parks-like effect. Such a behavior is ready to be checked by the future experiments. | |||
TO cite this article:ZHA Guoqiao. Little-Parks-like effect in mesoscopic superconducting rings[OL].[29 October 2011] http://en.paper.edu.cn/en_releasepaper/content/4447780 |
7. Golden Rule Characteristics of Electron-Lattice Interaction, Electron-pairing, and Phonon Depletion at Fermi Surface in Cuprates | |||
LI Qiang | |||
Physics 05 November 2010 | |||
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Abstract:In this paper, a model of electron pairing is presented based on a nonstationary interpretation of electron-lattice interactions. From a nonstationary view, electron-lattice system has an intrinsic time dependent characteristics as featured by Golden Rule. The primary essence of Golden Rule is resonance, by which electrons on matched pairing states are tuned to the lattice wave modes. If an electron pair is tuned with a sufficiently good quality factor, the threshold phonon of the pair can become redundant and can be released from the pair to produce a binding energy. Lattice modes falling in a common linewidth can compete with one another, much like modes competing in a lasing system. In cuprates, due to near-parallel band splitting features at or near Fermi Surface (EF), a great number of electron pairs are tuned to a relatively small number of lattice wave modes, leading to strong and effective mode competition and phonon transfer from EF towards the "kink", which results in phonon depletion at and near EF. This depletion should be responsible for enhanced superconducting critical temperature (Tc) of cuprates. Also discussed are the competition among multiple pairings associated with a common electron state and some effects of such competition on superconductivity. | |||
TO cite this article:LI Qiang. Golden Rule Characteristics of Electron-Lattice Interaction, Electron-pairing, and Phonon Depletion at Fermi Surface in Cuprates[OL].[ 5 November 2010] http://en.paper.edu.cn/en_releasepaper/content/4390614 |
8. Phonon as carrier of electromagnetic interaction between lattice wave modes and electrons and its role in superconductivity | |||
Li Qiang | |||
Physics 19 May 2010 | |||
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Abstract:In this paper we report the new results mainly including: 1) recognition that phonon is carrier of electromagnetic interaction between its lattice wave mode and electrons; 2) recognition that binding energy of electron pairs of high-temperature superconductivity is due to escape of optical threshold phonons, of electron pairs at or near Fermi level, from crystal by direct radiation; 3) recognition that binding energy of electron pairs of low-temperature superconductivity is possibly due to escape of non-optical threshold phonons by anharmonic crystal interactions; and, 4) recognition of two possible mechanisms explaining why some crystals never have a superconducting phase. While electron pairing is phonon-mediated in general, HTS should be associated with electron pairing mediated by optical phonon at or near EF, so the rarity of HTS corresponds to the rarity of such pairing match | |||
TO cite this article:Li Qiang. Phonon as carrier of electromagnetic interaction between lattice wave modes and electrons and its role in superconductivity[OL].[19 May 2010] http://en.paper.edu.cn/en_releasepaper/content/4373101 |
9. A mechanism of electron pairing relating to superconductivity | |||
Li Qiang | |||
Physics 17 April 2010 | |||
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Abstract:Mechanism of superconductivity is based on a mechanism of electron pairing near EF with definite binding energy. A candidate mechanism of such electron pairing is described in this paper. Electron pairs are induced by EM wave modes generated by corresponding lattice wave modes. The pairs are formed between E(k) faces, with definite binding energies. The binding energy of an electron pair is characterized by the frequency of the EM mode that induces the pairing. | |||
TO cite this article:Li Qiang. A mechanism of electron pairing relating to superconductivity[OL].[17 April 2010] http://en.paper.edu.cn/en_releasepaper/content/42033 |
10. Magnetization of Superconducting Rings | |||
Ma Xiaobai,Liu Liang,Wang Furen ,Nie Ruijuan ,Yao Dan,Dai Yuandong | |||
Physics 14 January 2009 | |||
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Abstract:We calculate the free energy of superconducting rings with two junction and superconducting ring array under different external magnetic fields, and give the phase branch diagram of the system within a range near the superconducting transition temperature. A theory of π junction and 0 junction is provided to explain the paramagnetic Meissner effect in both low Tc and high Tc superconductors. | |||
TO cite this article:Ma Xiaobai,Liu Liang,Wang Furen , et al. Magnetization of Superconducting Rings[OL].[14 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27818 |
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