Kametani, F., Polyanskii, A. A., Yamamoto, A., Jiang, J., Hellstrom, E. E., Gurevich, A., ...
In order to understand why the inter- and intra-granular current densities of polycrystalline superconducting oxypnictides differ by three orders of magnitude, we have conducted combined...
Appearance of Universal Metallic Dispersion in a Doped Mott Insulator (2008)
Sahrakorpi, S., Markiewicz, R. S., Lin, Hsin, Lindroos, M., Zhou, X. J., Yoshida, T., ...
We have investigated the dispersion renormalization $Z_{disp}$ in La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) over the wide doping range of $x=0.03-0.30$, for binding energies extending to several hundred meV's....
Hicks, C. W., Lippman, T. M., Huber, M. E., Ren, Z. A., Zhao, Z. X., Moler, K. A.
The recently-discovered iron oxypnictide family of superconductors, RFeAsO$_{1-x}$F$_y$, where $R$ is a rare earth, shows evidence that competing magnetism plays a key role in the superconductivity...
Jaroszynski, J., Riggs, S. C., Hunte, F., Gurevich, A., Larbalestier, D. C., Beobinger, G. S., ...
The recent discovery of a new class of superconducting oxypnictides with high transition temperatures may have profound implications for understanding unconventional high-temperature...
Yamamoto, A., Polyanskii, A. A., Jiang, J., Kametani, F., Tarantini, C., Hunte, F., ...
Early studies have found quasi-reversible magnetization curves in polycrystalline bulk rare-earth iron oxypnictides that suggest either wide-spread obstacles to intergranular current or very weak...
Evidence for Supercurrent Connectivity in Conglomerate Particles in NdFeAsO1-d (2008)
Moore, J D, Morrison, K, Yates, K A, Caplin, A D, Yeshurun, Y, Cohen, L F, ...
Here we use global and local magnetometry and Hall probe imaging to investigate the electromagnetic connectivity of the superconducting current path in the oxygen-deficient fluorine-free Nd-based...
Spin-singlet superconductivity with multiple gaps in PrO0.89F0.11FeAs (2008)
Matano, K., Ren, Z. A., Dong, X. L., Sun, L. L., Zhao, Z. X., Zheng, Guo-qing
Since the discovery of high transition-temperature (Tc) superconductivity in copper oxides two decades ago, continuous efforts have been devoted to searching for similar phenomenon in other...
Tarantini, C., Gurevich, A., Larbalestier, D. C., Ren, Z. A., Dong, X. L., Lu, W., ...
We present measurements of the temperature and field dependencies of the magnetization M(T,H) of Nd(O0.89F0.11)FeAs at fields up to 33T, which show that superconductivity with the critical...
Lu, W., Yang, J., Dong, X. L., Ren, Z. A., Che, G. C., Zhao, Z. X.
Diamagnetic susceptibility measurements under high hydrostatic pressure (up to 1.03 GPa) were carried out on the newly discovered Fe-based superconductor LaO_{1-x}F_{x}FeAs(x=0.11). The transition...
The hierarchy of multiple many-body interaction scales in high-temperature superconductors (2006)
Meevasana, W., Zhou, X. J., Sahrakorpi, S., Lee, W. S., Yang, W. L., Tanaka, K., ...
To date, angle-resolved photoemission spectroscopy has been successful in identifying energy scales of the many-body interactions in correlated materials, focused on binding energies of up to a few...
Tunnel ionization of open-shell atoms (2006)
A generalized ADK (Ammosov-Delone-Krainov) theory for ionization of open shell atoms is compared to ionization experiments performed on the transition metal atoms V, Ni, Pd, Ta, and Nb. Our theory is...
Xiao, R. J., Li, K. Q., Yang, H. X., Che, G. C., Zhang, H. R., Ma, C., ...
We performed an extensive investigation on the correlations among superconductivity, structural instability and band filling in Nb1-xB2 materials. Structural measurements reveal that a notable phase...
Anisotropic properties of Bi-2201 thin films grown on vicinal substrates (2005)
Zhang, Y. Z., Wang, Z., Zheng, D. N., Wen, H. H., Zhao, Z. X., Marneffe, J. F., ...
Xiang, J. Y., Liu, Z. Y., Li, J., Wang, P., Wang, R. L., Yang, H. P., ...
Pr$_{1-x}$Ca$_x$Ba$_2$Cu$_3$O$_{7-\delta}$($x\approx$0.5) thin films have been grown on SrTiO$_3$ and YSZ substrates by the pulsed laser ablation. The substrate temperature dependence of orientation...
Evidence of Coherent C-Axis Charge Transport in Underdoped La2-xSrxCuO4 Superconductors (2004)
Kim, Y. H., Hor, P. H., Dong, X. L., Zhou, F., Zhao, Z. X., Wu, Z., ...
We have observed the plasma edge in the normal state c-axis far-infrared (far-IR) reflectivity of La2-xSrxCuO4 (LSCO) single crystals at an unlikely Sr-doping concentration x = 0.07 but not in x =...
Multiple Bosonic Mode Coupling in Electron Self-Energy of (La_2-xSr_x)CuO_4 (2004)
Zhou, X. J., Shi, Junren, Yoshida, T., Cuk, T., Yang, W. L., Brouet, V., ...
High resolution angle-resolved photoemission spectroscopy data along the (0,0)-($\pi$,$\pi$) nodal direction with significantly improved statistics reveal fine structure in the electron self-energy...
Zhou, X. J., Yoshida, T., Yang, W. L., Brouet, V., Zhou, F., ...
High resolution angle-resolved photoemission measurements on underdoped (La$_{2-x}$Sr$_x$)CuO$_4$ system show that, at energies below 70 meV, the quasiparticle peak is well defined around the...
Ren, Z. A., Che, G. C., Ni, Y. M., Dong, C., Chen, H., Jia, S. L., ...
In this paper, the $Fe$-containing superconductors $Fe_{0.5}Cu_{0.5}Ba_2YCu_2O_{7+\delta}$, $Fe_{0.5}Cu_{0.5}BaSrYCu_2O_{7+\delta}$ and $Fe_{0.5}Cu_{0.5}Sr_2YCu_2O_{7+\delta}$ were successfully...
Zhou, F., Hor, P. H., Dong, X. L., Ti, W. X., Xiong, J. W., Zhao, Z. X.
A series of high-quality under-doped La2-xSrxCuO4 superconductor crystals with x = 0.063 - 0.125 were prepared by traveling-solvent floating-zone (TSFZ) technique. We found by dc magnetic...
Tong, X. M., Zhao, Z. X., Lin, C. D.
We studied the recollision dynamics between the electrons and D$_2^+$ ions following the tunneling ionization of D$_2$ molecules in an intense short pulse laser field. The returning electron...
Probing Molecular Dynamics at Attosecond Resolution with Femtosecond Laser Pulses (2003)
Tong, X. M., Zhao, Z. X., Lin, C. D.
The kinetic energy distribution of D$^+$ ions resulting from the interaction of a femtosecond laser pulse with D$_2$ molecules is calculated based on the rescattering model. From analyzing the...
Kim, Y. H., Hor, P. H., Dong, X. L., Zhou, F., Zhao, Z. X., Song, Y. S., ...
Through far-infrared studies of La2-xSrxCuO4 single crystals for x = 0.063, 0.07, 0.09, and 0.11, we found that only ~ 0.2 % of the total holes participated in the nearly dissipationless normal state...
The mechanical relaxation study of polycrystalline MgCNi3 (2003)
Yao, Y. X., Ying, X. N., Huang, Y. N., Wang, Y. N., Ren, Z. A., Che, G. C., ...
The mechanical relaxation spectra of a superconducting and a non-superconducting MgCNi3 samples were measured from liquid nitrogen temperature to room temperature at frequency of kilohertz. There are...
Van Look, L., Zhu, B. Y., Jonckheere, R., Zhao, B. R., Zhao, Z. X., Moshchalkov, V. V.
We investigate vortex pinning in thin superconducting films with a square array of rectangular submicron holes ("antidots"). Two types of antidots are considered: antidots fully perforating the...
Influence of Carbon Concentration on the Superconductivity in MgCxNi3 (2003)
Shan, L., Xia, K., Liu, Z. Y., Wen, H. H., Ren, Z. A., Che, G. C., ...
The influence of carbon concentration on the superconductivity (SC) in MgC$_{x}$Ni$_3$ has been investigated by measuring the low temperature specific heat combined with first principles electronic...
Wen, H. H., Liu, Z. Y., Xu, Z. A., Weng, Z. Y., Zhou, F., Zhao, Z. X.
Nernst effect has been measured for an underdoped and an optimally doped $La_{2-x}Sr_xCuO_4$ single crystal with the magnetic field applied along different directions. For both samples, when $H \|$...
Universal nodal Fermi velocity (2003)
Zhou, X. J., Yoshida, T., Lanzara, A., Bogdanov, P. V., Kellar, S. A., Shen, K. M., ...
Quantum tunneling of vortices in a MgB$_2$ superconductor (2002)
Zhang, Y. Z., Deltour, R., Wen, H. H., Jin, C. Q., Ni, Y. M., Jia, S. L, ...
Magnetic relaxation in a MgB$_2$ superconductor was measured. The temperature dependence of the normalized relaxation rate was determined for three different magnetic fields. By extrapolating these...
Irreversibility line of the MgB$_{2}$ superconductor (2001)
Zhang, Y. Z., Deltour, R., Wen, H. H., De Marneffe, J. F., Chen, H., Wang, S. F., ...
Magneto-resistivity of a c-axis oriented MgB$_{2}$ thin film was studied in perpendicular and parallel magnetic fields up to $\sim $23 T with temperatures down to 0.38 K. Resistive critical magnetic...
Xuan, Y., Tao, H. J., Li, Z. Z., Lin, C. T., Ni, Y. M., Zhao, B. R., ...
Temperature and doping dependent tunneling spectroscopy on $Bi_2Sr_2CaCu_2O_{8+\delta}$ single crystals has been investigated by using break-junction technique. The results provide direct evidence...
Effect of Mg and C contents in MgCNi3, and structure and superconductivity of MgCNi3-xCox (2001)
Ren, Z. A., Che, G. C., Jia, S. L., Chen, H., Ni, Y. M., Zhao, Z. X.
The effect of Mg and C contents on TC in MgCNi3, and structure and superconductivity of MgCNi3-xCox were studied. It is found that the excess of Mg and C in initial material mixture is favorable to...
Preparation and Superconductivity of a MgB2 Superconducting Tape (2001)
Che, G. C., Li, S. L., Ren, Z. A., Li, L., Jia, S. L., Ni, Y. M., ...
A MgB2 superconducting tape has been successfully prepared by a new way of boron diffusion into Mg tape. This tape superconductor has a Tc of 39 K with a sharp transition width of 0.4 K, high bulk...
Superconducting properties and c-axis superstructure of Mg1-xAlxB2 (2001)
Xiang, J. Y., Zheng, D. N., Li, J. Q., Li, L., Lang, P. L., Chen, H., ...
The superconducting and structural properties of a series of Mg1-xAlxB2 samples have been investigated. X-ray diffraction results confirmed the existence of a structural transition associated with...
Superconductivity and Aluminum Ordering in Mg1-xAlxB2 (2001)
Li, J. Q., Li, L., Liu, F. M., Dong, C., Xiang, J. Y., Zhao, Z. X.
Superconductivity and structural properties of Mg1-xAlxB2 materials have been systematically investigated. Evident modifications in both superconductivity and microstructure are identified to...
Structural features, stacking faults, and grain boundaries in MgB2 superconducting materials (2001)
Li, J. Q., Li, L., Zhou, Y. Q., Ren, Z. A., Che, G. C., Zhao, Z. X.
The structural properties of MgB2 superconductors have been analyzed by means of convergent-beam electron diffraction, high-resolution transmission-electron microscopy, and theoretical simulations....
Flux dynamics and vortex phase diagram of the new superconductor $MgB_2$ (2001)
Wen, H. H., Li, S. L., Zhao, Z. W., Ni, Y. M., Ren, Z. A., Che, G. C., ...
Magnetic critical current density and relaxation rate have been measured on $MgB_2$ bulks from 1.6 K to $T_c$ at magnetic fields up to 8 Tesla. A vortex phase diagram is depicted based on these...
Superconductivity at 49 K in copper doping magnesium diboride (2001)
Sun, Y. P., Song, W. H., Dai, J. M., Zhao, B., Du, J. J., Wen, H. H., ...
This paper has been withdrawn by the author(s) because some experimental results have not been checked by the last two authors.
Li, S. L., Wen, H. H., Zhao, Z. W., Ni, Y. M., Ren, Z. A., Che, G. C., ...
The lower critical field $H_{c1}$ has been carefully measured on a well shaped cylindrical sample of the new superconductor $MgB_2$ fabricated by high pressure synthesis. The penetration depth...
Strong quantum fluctuation of vortices in the new superconductor $MgB_2$ (2001)
Wen, H. H., Li, S. L., Zhao, Z. W., Ni, Y. M., Ren, Z. A., Che, G. C., ...
By using transport and magnetic measurement, the upper critical field $H_{c2}(T)$ and the irreversibility line $H_{irr}(T)$ has been determined. A big separation between $H_{c2}(0)$ and $H_{irr}(0)$...
Wen, H. H., Chen, X. H., Yang, W. L., Zhao, Z. X.
By measuring the superconducting diamagnetic moments for an underdoped and an overdoped La_{2-x}Sr_xCuO_4 single crystal with equal qualities and roughly equal transition temperatures, it is found...
Zhang, Y. Z., Deltour, R., Qin, Y. L., Li, L., Zhao, Z. X., ...
Zhang, Y. Z., Deltour, R., Qin, Y. L., Weu, H. H., Li, L., ...
Upper critical and irreversibility field of over-doped Tl2Ba2CuO6+d superconductors (2000)
Zheng, D. N., Li, J. Q., Lin, C. T., Yan, S. L., Fang, L., Ni, Y. M., ...
Booth, C. H., Bridges, F., Boyce, J. B., Claeson, T., Zhao, Z. X., Cervantes, P.
We present K-edge XAFS (X-Ray Absorption Fine Structure) data for various concentrations of Pr in Y$_{1- x}$Pr$_{x}$Ba$_{2}$Cu$_{3}$O$_{7}$. The character of the Pr K-edge XAFS data indicate that...