arXiv subjects

X. Q. Huang

Publications and source records attributed to X. Q. Huang.

11 recordsLinked to original sources

arXiv2012

Short-range symmetry breaking induced structural collapse and Tc enhancement in 122-type iron pnictide superconductors

In this paper, we investigate analytically the experimental observations of structural collapse and Tc enhancement in the rare earth-doped 122-type iron-based pnictide superconductors [S. R. Saha et.al. Phys. Rev. B 85, 024525 (2012), arXiv:1105.4798 (2011); B. Lv et al. PNAS 108, 15705 (2011).]. Based on the real-space effective c-axis lattice constant theory of superconductivity [X. Q. Huang, arXiv:1001.5067], it is shown that the abrupt c-axis reduction of the superconductors is due to the structural phase transition (an ultra-short-range symmetry breaking) of the charge stripe lattice. The existence of this phase transition corresponds to the change from the full-doped superconducting planes to the half-doped superconducting planes in the studied superconductors. It is estimated that this phase transition may help to promote the superconducting transition temperature of the 122 family up to as high as 80 K.

cond-mat.supr-con↗

arXiv2011

Are the high-Tc superconductors strongly correlated electron systems?

In this paper, we argue that the high-temperature superconductors do not belong to strong correlated electron systems. It is shown that both the two-dimensional Hubbard and t-J models are inadequate for describing high temperature superconductivity. In our opinion, a superconducting phase should be an energy minimum electronic state which can be described in a new framework where the electron-electron interactions (both on-site Hubbard term and off-site term) and the electron-phonon interaction can be completely suppressed.

cond-mat.supr-con↗

arXiv2011

Does the isotope effect of mercury support the BCS theory?

In this paper, we reexamine the results of isotope effect experiments of the conventional monoatomic superconductor (Hg). It is shown clearly that the isotopic coefficients of mercury can be largely deviated from $α=0.5$, the standard value suggested by the phonon-mediated BCS pairing theory. According to the reported experimental results of various mercury isotopes, a giant isotope effect ($α=2.896$) is numerically found in the data. This study indicates that the validity of the conventional BCS theory cannot be verified by the isotope effect.

cond-mat.supr-con↗

arXiv2010

The Physical Origins of the Meissner Effect and London Penetration Depth

Based on the recent developed real-space theory of superconductivity (arXiv:0910.5511 and arXiv:1001.5067), we study the physical nature of the Meissner effect and London penetration depth in conventional and non-conventional superconductors. It is argued that they originate from an exactly the same reason of the real-space quasi-one-dimensional periodic dynamic charge stripes in the superconductors. The fundamental relationship between the London penetration depth and the superconducting electron density is qualitatively determined.

cond-mat.supr-con↗

arXiv2010

Magic doping: From the localized hole-pair to the checkerboard patterns

Intensive experiments have revealed that the superconductivity of the hole-doped cuprates can be strongly suppressed at the so-called magic doping fractions. Despite great research efforts, the origin of the `magic doping' remains mysterious. Recently, we have developed a real-space theory of high-temperature superconductivity which reveals the intrinsic relationship between the localized Cooper pair and the localized hole pair (arXiv:1007.3536). Here we report that the theory can naturally explain the emergence of non-superconducting checkerboard phases and the magic doping problem in hole-doped cuprate superconductors. It clearly shows that there exist only seven `magic numbers' in the cuprate family at $x=$1/18, 1/16, 2/25, 1/9, 1/8, 2/9 and 1/4 with 6a*6a, 4a*4a, 5a*5a, 3a*3a, 4a*4a, 3a*3a and 2a*2a checkerboard patterns, respectively. Moreover, our framework leads directly to a satisfactory explanation of the most recent discovery [M. J. Lawler, et al. Nature 466, 347 (2010)] of the symmetries broken within each copper-oxide unit in hole-doped cuprate superconductors. These findings may shed new light on the mechanism of superconductivity.

cond-mat.supr-con↗

arXiv2010

Model of d-wave electron pairing in hole doped cuprate superconductors: A possible explanation for the pseudogap regime

The real-space localized hole pair is constructed in the Cu-O plane of the hole-doped cuprate superconductors. We prove analytically and numerically that two electrons, due to the nearest-neighbor Coulomb repulsive confinement effect, can be in pairing inside a single plaquette with the d-wave symmetry. The scenario supports the `no glue' pairing picture for the cuprates. Based on the scenarios, the physical origin of the Fermi pocket (or Fermi arc) and the two pseudogap behavior are provided. Our framework leads directly to a unified linear relationship between the pseudogap temperature T* and the hole doping level x in these compounds.

cond-mat.str-el↗

arXiv2010

A real-space effective c-axis lattice constant theory of superconductivity

Based on the recent developed real-space picture of superconductivity, we study the stability of the superconducting vortex lattices in layered superconductors. It is shown that the effective c-axis lattice constant play a significant role in promoting the superconducting transition temperature in these materials. An unified expression Tc(max)=10c*-28 can be applied to estimate the highest possible Tc(max) for a given layered superconductor with an effective c-axis lattice constant c*. For the newly discovered iron-based superconductors, our results suggest that their Tc cannot exceed 60K, 50K and 40K for the 1111, 21311 and 122 series, respectively. In the case of copper-based oxide superconductors, it seems that the highest Tc can reach about 161K without applying of the external pressure. In our theoretical framework, we could interpret the experimental results of the completely different superconducting transition temperatures obtained in two very similar cuprate superconductors (La{2-x}Ba{x}CuO{4} of 40K and Sr{2-x}Ba{x}CuO{3+δ} of 98K). In addition, the physical reason why the superconductivity does not occur in noble metals (like gold, silver and copper) is discussed. Finally, we argue that the metallic hydrogen cannot exhibit superconductivity at room temperature, it even cannot be a superconductor at any low temperature.

cond-mat.str-el↗

arXiv2009

A Real Space Description of the Superconducting and Pseudogap Phase

In this work, we study the relationship between the superconducting phase and pseudogap phase in a real-space picture. We suggest that the superconducting ground states are guaranteed by the energy minimum charge structure of the quasi-one-dimensional Peierls chains (static vortex lines). It is shown that there is a charge ordering phase transition from the Peierls chains (the superconducting ground state) to the periodic chains (the superconducting excited state) in any superconductors. In our scenarios, all the superconducting electrons can be considered as the "inertial electrons"at some stable zero-force positions. Furthermore, we prove analytically that two electrons, due to a short-range real space Coulomb confinement effect (the nearest-neighbor electromagnetic interactions), can be in pairing inside a single plaquette with four negative ions. This implies that the pseudogap phenomenon can be found from a wide variety of materials, not just the cuprate superconductors.

cond-mat.str-el↗

arXiv2009

The Mystery of Superconductivity: Glue or No Glue?

In this study, a possible non-quasiparticle glue for superconductivity of both conventional and unconventional superconductors is explored in a pure electron picture. It is shown clearly that the moving electrons due to the electromagnetic interaction can self-organize into some quasi-one-dimensional real-space charge stripes, which can further form some thermodynamically stable vortex lattices with trigonal or tetragonal symmetry. The relationships among the charge stripes, the Cooper pairs and the Peierls phase transition are discussed. The suggested mechanism (glue) of the superconductivity may be valid for the one- and two-dimensional superconductors. We also argue that the highest critical temperature of the doped superconductors is most likely to be achieved around the Mott metal-insulator transition.

cond-mat.supr-con↗

arXiv2009

New insight into the Hall effect

In this paper, we develop a unified theory for describing Hall effect in various electronic systems based on a pure electron picture (without the hole concept). We argue that the Hall effect is the magnetic field induced symmetry breaking of the charge carrier's spatial distribution. Due to the interaction of the charge carriers and the ion lattice, there are two possible symmetry breaking mechanisms which cause different signs of Hall coefficient in a Hall material. The scenario provides an explicit explanation of the sign different of the Hall coefficient in the N-type and P-type semiconductors, the sign reversal induced by both temperature and magnetic field in different materials, and the integer and fractional quantum Hall effect (QHE) in two-dimensional electron gas (2DEG) of GaAs/AlGaN heterostructures.

cond-mat.str-el↗

arXiv2006

New interpretation of the atomic spectra and other quantum phenomena: A mixed mechanism of classical $LC$ circuits and quantum wave-particle duality

We study the energy conversion laws of the macroscopic harmonic $LC $ oscillator, the electromagnetic wave (photon) and the hydrogen atom. As our analysis indicates that the energies of these apparently different systems obey exactly the same energy conversion law. Based on our results and the wave-particle duality of electron, we find that the atom in fact is a natural microscopic $LC$ oscillator. In the framework of classical electromagnetic field theory we analytically obtain, for the hydrogen atom, the quantized electron orbit radius. Without the adaptation of any other fundamental principles of quantum mechanics, we present a reasonable explanation of the polarization of photon, the Zeeman effect, Selection rules and Pauli exclusion principle. Particularly, it is found that a pairing Pauli electron can move closely and steadily in a DNA-like double helical electron orbit. Our results also reveal an essential connection between electron spin and the intrinsic helical movement of electron and indicate that the spin itself is the effect of quantum confinement. In addition, a possible physical mechanism of superconductivity and the deeper physical understandings of the electron mass, zero point energy, and the hardness property of electron are also provided. Finally, we show analytically that the Dirac's quantization of magnetic monopole is merely a special handed electron at absolute zero-temperature, which strongly suggests that any efforts to seek for the magneticmonopole in real space will be entirely in vain. Furthermore, it appears that the electron's spin and the magnetic monopole are actually two different concepts for one possible physical phenomenon.

physics.gen-ph↗