Luan, Lan, Auslaender, Ophir M., Bonn, Douglas A., Liang, Ruixing, Hardy, Walter N., Moler, Kathryn A.
We use magnetic force microscopy to both image and manipulate individual vortex lines threading single crystalline YBa$_2$Cu$_3$O$_{6.4}$, a layered superconductor. We find that when we pull the top...
Huttema, W. A., Bobowski, J. S., Turner, P. J., Liang, Ruixing, Hardy, W. N., Bonn, D. A., ...
High resolution measurements of superfluid density and broadband quasiparticle conductivity have been used to probe the low energy excitation spectrum of nodal quasiparticles in underdoped YBCO....
Mechanics of Individual, Isolated Vortices in a Cuprate Superconductor (2008)
Auslaender, Ophir M., Luan, Lan, Straver, Eric W. J., Hoffman, Jennifer E., Koshnick, Nicholas C., Zeldov, Eli, ...
Superconductors often contain quantized microscopic whirlpools of electrons, called vortices, that can be modeled as one-dimensional elastic objects. Vortices are a diverse playground for condensed...
Electron pockets in the Fermi surface of hole-doped high-Tc superconductors (2008)
LeBoeuf, David, Doiron-Leyraud, Nicolas, Levallois, Julien, Daou, R., Hussey, N. E., ...
High-temperature superconductivity occurs as copper oxides are chemically tuned to have a carrier concentration intermediate between their metallic state at high doping and their insulating state at...
Guikema, J. W., Bluhm, Hendrik, Bonn, D. A., Liang, Ruixing, Hardy, W. N., Moler, K. A.
We report scanning Hall probe microscopy of highly underdoped superconducting YBa_2Cu_3O_{6+x} with T_c ranging from 5 to 15 K which showed distinct flux bundles with less than one superconducting...
Quantum oscillations and the Fermi surface in an underdoped high-Tc superconductor (2008)
Doiron-Leyraud, Nicolas, Proust, Cyril, LeBoeuf, David, Levallois, Julien, Bonnemaison, Jean-Baptiste, Liang, Ruixing, ...
Despite twenty years of research, the phase diagram of high transition- temperature superconductors remains enigmatic. A central issue is the origin of the differences in the physical properties of...
Oxygen Chain Disorder as the Weak Scattering Source in YBa$_2$Cu$_3$O$_{6.50}$ (2006)
Bobowski, J. S., Turner, P. J., Harris, R., Liang, Ruixing, Bonn, D. A., Hardy, W. N.
The microwave conductivity of an ultra-pure single crystal of YBa$_2$Cu$_3$O$_{6.50}$ has been measured deep in the superconducting state as a continuous function of frequency from $0.5\to20$ GHz....
Yamani, Z., Statt, B. W., MacFarlane, W. A., Liang, Ruixing, Bonn, D. A., Hardy, W. N.
Nuclear magnetic resonance (NMR) measurements of CuO chains of detwinned Ortho-II YBa$_2$Cu$_3$O$_{6.5}$ (YBCO6.5) single crystals reveal unusual and remarkable properties. The chain Cu resonance...
Onset of a boson mode at superconducting critical point of underdoped YBa2Cu3Oy (2006)
Doiron-Leyraud, Nicolas, Sutherland, Mike, Li, S. Y., Taillefer, Louis, Liang, Ruixing, Bonn, D. A., ...
The thermal conductivity $\kappa$ of underdoped \Y was measured in the $T \to 0$ limit as a function of hole concentration $p$ across the superconducting critical point at $p_{SC}$ = 5.0%. ``Time...
Harris, R., Turner, P. J., Kamal, Saeid, Hosseini, A. R., Dosanjh, P., Mullins, G. K., ...
Extensive measurements of the microwave conductivity of highly pure and oxygen-ordered \YBCO single crystals have been performed as a means of exploring the intrinsic charge dynamics of a d-wave...
Insulating transition in the flux-flow resistivity of a high temperature superconductor (2005)
Morgan, Benjamin, Broun, D. M., Liang, Ruixing, Bonn, D. A., Hardy, W. N., Waldram, J. R.
Measurements of the DC resistivity of under-doped cuprate superconductors have revealed a metal--insulator transition at low temperatures when superconductivity is suppressed by a very large magnetic...
Evaluation of CuO2 plane hole doping in YBa2Cu3O6+x single crystals (2005)
Liang, Ruixing, Bonn, D. A., Hardy, W. N.
The electron hole concentration p in the CuO2 planes of YBa2Cu3O6+x (YBCO) has been evaluated using the unit cell length in the c-direction together with a simple estimation for p in the chain oxygen...
Apparatus for high resolution microwave spectroscopy in strong magnetic fields (2005)
Huttema, W. A., Morgan, B., Turner, P. J., Hardy, W. N., Zhou, Xiaoqing, Bonn, D. A., ...
We have developed a low temperature, high-resolution microwave surface impedance probe that is able to operate in high static magnetic fields. Surface impedance is measured by cavity perturbation of...
Superfluid Density in a Highly Underdoped YBCO Superconductor (2005)
Broun, D. M., Huttema, W. A., Turner, P. J., Ozcan, S., Morgan, B., Liang, Ruixing, ...
The superfluid density rho_s(T) = 1/lambda^2(T) has been measured at 2.64 GHz in highly underdoped YBCO, at 37 dopings with T_c between 3 K and 17 K. Within limits set by the transition width Delta...
The a-axis optical conductivity of detwinned ortho-II YBa_2Cu_3O_6.50 (2005)
Hwang, J., Yang, J., Timusk, T., Sharapov, S. G., Carbotte, J. P., Bonn, D. A., ...
The a-axis optical properties of a detwinned single crystal of YBa_2Cu_3O_6.50 in the ortho II phase (Ortho II Y123, T_c= 59 K) were determined from reflectance data over a wide frequency range (70 -...
Fermi Surface and Quasiparticle Excitations of overdoped Tl2Ba2CuO6+d by ARPES (2005)
Plate, M., Mottershead, J. D. F., Elfimov, I. S., Peets, D. C., Liang, Ruixing, Bonn, D. A., ...
The electronic structure of the high-T_c superconductor Tl2Ba2CuO6+d is studied by ARPES. For a very overdoped Tc=30K sample, the Fermi surface consists of a single large hole pocket centered at...
Doping dependence of the superconducting gap in Tl_2Ba_2CuO_{6+delta} from heat transport (2005)
Hawthorn, D. G., Li, S. Y., Sutherland, M., Boaknin, Etienne, Hill, R. W., Proust, C., ...
We present low-temperature thermal conductivity measurements on the cuprate Tl_2Ba_2CuO_{6+delta} throughout the overdoped regime. In the T -> 0 limit, the thermal conductivity due to d-wave nodal...
Delocalized fermions in underdoped cuprates (2005)
Sutherland, Mike, Li, S. Y., Hawthorn, D. G., Hill, R. W., Ronning, F., Tanatar, M. A., ...
Low temperature heat transport was used to investigate the ground state of high-purity single crystals of the lightly-doped cuprate YBa$_{2}$Cu$_{3}$O$_{6.33}$. Samples were measured on either side...
Universal scaling relation in high-temperature superconductors (2004)
Homes, C. C., Dordevic, S. V., Strongin, M., Bonn, D. A., Liang, Ruixing, Hardy, W. N., ...
Scaling laws express a systematic and universal simplicity among complex systems in nature. For example, such laws are of enormous significance in biology. Scaling relations are also important in the...
Hosseini, A., Broun, D. M., Sheehy, D. E., Davis, T. P., Franz, M., Liang, Ruixing, ...
In the cuprate superconductor $YBa_2Cu_3O_{6+x}$, hole doping in the $CuO_2$ layers is controlled by both oxygen content and the degree of oxygen-ordering. At the composition $\rm YBa_2Cu_3O_{6.35}$,...
Pereg-Barnea, T., Turner, P. J., Harris, R., Mullins, G. K., Bobowski, J. S., Raudsepp, M., ...
Zero-field electron spin resonance (ESR) of dilute Gd ions substituted for Y in the cuprate superconductor YBa$_2$Cu$_3$O$_{\rm 6+y}$ is used as a novel technique for measuring the absolute value of...
Diffusion of Nonequilibrium Quasiparticles in a Cuprate Superconductor (2003)
Gedik, N., Orenstein, J., Liang, Ruixing, Bonn, D. A., Hardy, W. N.
We report a transport study of nonequilibrium quasiparticles in a high-Tc cuprate superconductor using the transient grating technique. Low-intensity laser excitation (at photon energy 1.5 eV) was...
Single-quasiparticle stability and quasiparticle-pair decay in YBa2Cu3O6.5 (Ortho II) (2003)
Gedik, N., Blake, P., Spitzer, R. C., Orenstein, J., Liang, Ruixing, Bonn, D. A., ...
We report results and analysis of time-resolved photoinduced reflectivity experiments on the cuprate superconductor YBa2Cu3O6.5. The sample, which has Tc=45 K, was characterized by a high degree of...
Transport in Ultraclean YBa$_2$Cu$_3$O$_7$: neither Unitary nor Born Impurity Scattering (2003)
Hill, R. W., Lupien, Christian, Sutherland, M., Boaknin, Etienne, Hawthorn, D. G., Proust, Cyril, ...
The thermal conductivity of ultraclean YBa$_2$Cu$_3$O$_7$ was measured at very low temperature in magnetic fields up to 13 T. The temperature and field dependence of the electronic heat conductivity...
Sum rules and energy scales in the high-temperature superconductor YBa2Cu3O6+x (2003)
Homes, C. C., Dordevic, S. V., Bonn, D. A., Liang, Ruixing, Hardy, W. N.
The Ferrell-Glover-Tinkham (FGT) sum rule has been applied to the temperature dependence of the in-plane optical conductivity of optimally-doped YBa_2Cu_3O_{6.95} and underdoped YBa_2Cu_3O_{6.60}....
Superconductivity and Field-Induced Magnetism in Pr$_{2-x}$Ce$_x$CuO$_4$ Single Crystals (2003)
Sonier, J. E., Poon, K. F., Luke, G. M., Kyriakou, P., Miller, R. I., Liang, Ruixing, ...
We report muon-spin rotation/relaxation (muSR) measurements on single crystals of the electron-doped high-T_c superconductor Pr$_{2-x}$Ce$_x$CuO$_4$. In zero external magnetic field,...
Sutherland, Mike, Hawthorn, D. G., Hill, R. W., Ronning, F., Wakimoto, S., Zhang, H., ...
Heat transport in the cuprate superconductors YBa$_2$Cu$_3$O$_{y}$ and La$_{2-x}$Sr$_x$CuO$_4$ was measured at low temperatures as a function of doping. A residual linear term kappa_{0}/T is observed...
Growth of Orthorhombic Tl-2201 Single Crystals by the Self-Flux Method (2002)
Peets, D. C., Liang, Ruixing, Bonn, D. A., Hardy, W. N., Raudsepp, M.
This article's content has now been absorbed into cond-mat/0609250, which supercedes it.
Top-Seeded Melt-Growth of YBa_2Cu_3O_x Crystals for Neutron Diffraction Studies (2002)
Peets, D. C., Liang, Ruixing, Stock, C., Buyers, W. J. L., Tun, Z., Taillefer, L., ...
We have grown cubic centimetre-size crystals of YBa2Cu3Ox suitable for neutron studies, by a top-seeded melt-growth technique. Growth conditions were optimized with an eye toward maximizing phase...
Liang, Ruixing, Bonn, D. A., Hardy, W. N., Wynn, Janice C., Moler, K. A., Lu, L., ...
High-purity and homogeneous YBa2Cu3Oy single crystals with carrier doping level near the AFM-SC boundary have been obtained in the oxygen content range between y = 6.340 and 6.370. The crystals are...
Turner, P. J., Harris, R., Kamal, Saeid, Hayden, M. E., Broun, D. M., Morgan, D. C., ...
There has long been a discrepancy between microwave conductivity measurements in high temperature superconductors and the conductivity spectrum expected in the simplest models for impurity scattering...
Photoinduced Changes of Reflectivity in Single Crystals of YBa2Cu3O6.5 (Ortho II) (2001)
Segre, G. P., Gedik, N., Orenstein, J., Bonn, D. A., Liang, Ruixing, Hardy, W. N.
We report measurements of the photoinduced change in reflectivity of an untwinned single crystal of YBa2Cu3O6.5 in the ortho II structure. The decay rate of the transient change in reflectivity is...
Dulic, Diana, Hak, J., Hardy, W. N., Koshelev, A. E., Liang, Ruixing, ...
Infrared spectroscopy has been used to investigate the temperature dependence and c-axis magnetic field dependence of the Josephson plasma resonance in optimally doped Tl2Ba2CaCu2O8 thin films, and...
Giant Peak Effect Observed in Ultrapure YBCO Crystal (1999)
Shi, Jing, Ling, X. S., Liang, Ruixing, Bonn, D. A., Hardy, W. N.
A giant peak in the temperature dependence of the screening current is observed in the ac magnetic response of an ultra-pure YBa$_2$Cu$_3$O$_{6.993}$ crystal in a magnetic field. At H = 2.0 T ({\bf...
Microwave Spectroscopy of Thermally Excited Quasiparticles in YBa_2Cu_3O_{6.99} (1998)
Hosseini, A., Harris, R., Kamal, Saeid, Dosanjh, P., Preston, J., Liang, Ruixing, ...
We present here the microwave surface impedance of a high purity crystal of $YBa_2Cu_3O_{6.99}$ measured at 5 frequencies between 1 and 75 GHz. This data set reveals the main features of the...
Bidinosti, C. P., Hardy, W. N., Bonn, D. A., Liang, Ruixing
We present measurements of the magnetic field dependence of the penetration depth Lambda(H) for untwinned YBa_2Cu_3O_6.95 for temperatures from 1.2 to 70 K in dc fields up to 42 gauss and directions...
Growth of High Quality YBCO Single Crystals Using BaZrO (1998)
Using Bazro Crucibles, Ruixing Liang, D. A. Bonn, W. N. Hardy
High density BaZrO 3 ceramic crucibles have been successfully fabricated and used to grow high quality YBa 2 Cu 3 O 7-x single crystals by the BaO-CuO self flux method. The ceramic crucibles are...
Kamal, S., Liang, Ruixing, Hosseini, A., Bonn, D. A., Hardy, W. N.
We have succeeded in growing very high purity (99.995%) YBa_2Cu_3O_{7-delta} crystals in BaZrO_3 crucibles and have measured Delta-lambda(T) and R_s(T) at 1 GHz in crystals with various oxygen...
Sonier, J. E., Brewer, J. H., Kiefl, R. F., Bonn, D. A., Dunsiger, S. R., Hardy, W. N., ...
The internal field distribution in the vortex state of YBa2Cu3O6.60 is shown to be a sensitive measure of both the magnetic penetration depth and the vortex-core radius. The temperature dependence of...
Moler, Kathryn A., Baar, David J., Liang, Ruixing, Hardy, Walter N., Kapitulnik, Aharon
The anisotropy of the magnetic field dependence of the specific heat of YBa$_2$Cu$_3$O$_{7 - {\rm \delta}}$ can be used to identify different low-energy excitations, which include phonons, spin-$...