A New Apparatus for Detecting Micron-Scale Deviations from Newtonian Gravity (2008)
Weld, D. M., Xia, J., Cabrera, B., Kapitulnik, A.
We describe the design and construction of a new apparatus for detecting or constraining deviations from Newtonian gravity at short length scales. The apparatus consists of a new type of probe with...
Siemons, W., Steiner, M.A., Koster, G., Blank, D.H.A., Beasley, M.R., Kapitulnik, A.
In this paper, we introduce a unique method for fabricating MgB2/MgO multilayers and demonstrate the potential for using them as a new model for disordered superconductors. In this approach, we...
Xia, Jing, Schemm, Elizabeth, Deutscher, G., Kivelson, S.A., Bonn, D.A., Hardy, W.N., ...
The polar Kerr effect in the high-Tc superconductor YBa2Cu3O6+x was measured at zero magnetic field with high precision using a cyogenic Sagnac fiber interferometer. We observed nonzero Kerr...
Xia, Jing, Schemm, Elizabeth, Deutscher, G., Kivelson, S. A., Bonn, D. A., Hardy, W. N., ...
Polar Kerr effect in the high-Tc superconductor \YBCO was measured at zero magnetic field with high precision using a cyogenic Sagnac fiber interferometer. We observed non-zero Kerr rotations of...
Siemons, W., Steiner, M. A., Koster, G., Blank, D. H. A., Beasley, M. R., Kapitulnik, A.
In this paper we introduce a novel method for fabricating MgB$_2$/MgO multilayers and demonstrate the potential for using them as a new model for disordered superconductors. In this approach we...
STM Studies of TbTe3: Evidence for a fully Incommensurate Charge Density Wave (2007)
Fang, A., Ru, N., Fisher, I. R., Kapitulnik, A.
We observe unidirectional charge density wave ordering on the cleaved surface of TbTe3 with a Scanning Tunneling Microscope at ~6 K. The modulation wave-vector q_{CDW} as determined by Fourier...
Jamei, R., Robertson, J., Kim, E-A., Fang, A., Kapitulnik, A., Kivelson, S. A.
While the influence of impurities on the local density of states (LDOS) in a metal is notoriously non-local due to interference effects, low order moments of the LDOS in general can be shown to...
Feedback Control and Characterization of a Microcantilever Using Optical Radiation Pressure (2006)
We describe a method for feedback-regulation of a microcantilever's response using optical radiation pressure. One laser measures the position of the cantilever and another laser applies a force that...
High Temperature Superconducting Films and Crystals (2006)
Kapitulnik, A., Geballe, T. H.
The work carried out under this grant has been the investigation of thin films and single crystals of the layered cuprate high-temperature superconductors, as well as other model systems. A primary...
Constraints on Yukawa-Type Deviations from Newtonian Gravity at 20 Microns (2005)
Smullin, S. J., Geraci, A. A., Weld, D. M., Chiaverini, J., Holmes, S., Kapitulnik, A.
Recent theories of physics beyond the standard model have predicted deviations from Newtonian gravity at short distances. In order to test these theories, we have a built an apparatus that can...
Inhomogeneity Induces Resonance Coherence Peaks in Superconducting BSCCO (2005)
Fang, A. C., Capriotti, L., Scalapino, D. J., Kivelson, S. A., Kaneko, N., Greven, M., ...
In this paper we analyze, using scanning tunneling spectroscopy, the density of electronic states in nearly optimally doped BSCCO in zero field. Focusing on the superconducting gap, we find patches...
STM Studies of Near-Optimal Doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ (2004)
Kapitulnik, A., Fang, A., Howald, C., Greven, M.
In this paper we summarize our STM studies of the density of electronic states in nearly optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ in zero field. We report on the inhomogeneity of the gap...
Steiner, M. A., Boebinger, G., Kapitulnik, A.
The behavior of some high temperature superconductors (HTSC) such as $\rm La_{2-x}Sr_{x}CuO_{4}$ and $\rm Bi_{2}Sr_{2-x}La_xCuO_{6+\delta}$, at very high magnetic field, is similar to that of thin...
Periodic Coherence Peak Height Modulations in Superconducting BSCCO (2004)
Fang, A., Howald, C., Kaneko, N., Greven, M., Kapitulnik, A.
In this paper we analyze, using scanning tunneling spectroscopy (STS), the local density of electronic states (LDOS) in nearly optimally doped BSCCO in zero field. We see both dispersive and...
How to detect fluctuating order in the high-temperature superconductors (2002)
Kivelson, S. A., Fradkin, E., Oganesyan, V., Bindloss, I. P., Tranquada, J. M., Kapitulnik, A., ...
We discuss fluctuating order in a quantum disordered phase proximate to a quantum critical point, with particular emphasis on fluctuating stripe order. Optimal strategies for extracting information...
New Experimental Constraints on Non-Newtonian Forces below 100 microns (2002)
Chiaverini, J., Smullin, S. J., Geraci, A. A., Weld, D. M., Kapitulnik, A.
We have searched for large deviations from Newtonian gravity by means of a microcantilever-based Cavendish-style experiment. Our data eliminate from consideration mechanisms of deviation that posit...
Periodic Density of States Modulations in Superconducting $\rm Bi_2Sr_2CaCu_2O_{8+\delta}$ (2002)
Howald, C., Eisaki, H., Kaneko, N., Greven, M., Kapitulnik, A.
In this paper we show, using scanning tunneling spectroscopy (STS), the existence of static striped density of electronic states in nearly optimally doped $\rm Bi_2Sr_2CaCu_2O_{8+\delta}$ in zero...
Sasagawa, T., Mang, P. K., Vajk, O. P., Kapitulnik, A., Greven, M.
Although La(2)Cu(1-x)Li(x)O(4) [Li-LCO] differs from La(2-x)Sr(x)CuO(4) [Sr-LCO] in many ways (e.g., the absence of metallic transport, high-Tc superconductivity, and incommensurate antiferromagnetic...
Coexistence of charged stripes and superconductivity in Bi2Sr2CaCu2O8+d (2002)
Howald, C., Eisaki, H., Kaneko, N., Kapitulnik, A.
One of the most important outstanding problems in condensed matter physics is determination the ground state of strongly correlated electron system, in particular high-temperature superconductors...
Inherent Inhomogeneities in Tunneling Spectra of BSCCO Crystals in the Superconducting State (2001)
Howald, C., Fournier, P., Kapitulnik, A.
Scanning Tunneling Spectroscopy on cleaved BSCCO(2212) single crystals reveal inhomogeneities on length-scales of $\sim$30 $\AA$. While most of the surface yields spectra consistent with a d-wave...
Microcantilever Studies of Angular Field Dependence of Vortex Dynamics in BSCCO (2000)
Chiaverini, J., Yasumura, K., Kapitulnik, A.
Using a nanogram-sized single crystal of BSCCO attached to a microcantilever we demonstrate in a direct way that in magnetic fields nearly parallel to the {\it ab} plane the magnetic field penetrates...
Deviations from Matthiessen's Rule for ${\rm SrRuO_3}$ and ${\rm CaRuO_3}$ (2000)
Klein, L., Kats, Y., Wiser, N., Konczykowski, M., Reiner, J. W., Geballe, T. H., ...
We have measured the change in the resistivity of thin films of ${\rm SrRuO_3}$ and ${\rm CaRuO_3}$ upon introducing point defects by electron irradiation at low temperatures, and we find significant...
Chiaverini, J., Eckstein, J. N., Bozovic, I., Doniach, S., Kapitulnik, A.
The large flux-flow velocity behavior of the high temperature superconductor BSCCO in the mixed state is studied by measurement of the current-voltage characteristic as a function of temperature and...
Thermal conductivity of pure and Mg-doped CuGeO_3 in the incommensurate phase (2000)
Takeya, J., Tsukada, I., Ando, Yoichi, Masuda, T., Uchinokura, K., Tanaka, I., ...
The thermal conductivity \kappa of Cu_1-xMg_xGeO_3 is measured in magnetic fields up to 16 T. At the transition field H_c to the high-field incommensurate (I) phase, \kappa abruptly decreases. While...
Observation of domain wall resistivity in $\rm SrRuO_3$ (1999)
Klein, L., Kats, Y., Marshall, A. F., Reiner, J. W., Geballe, T. H., Beasley, M. R., ...
$\rm SrRuO_3$ is an itinerant ferromagnet with $T_c \sim 150 \rm K$. When $\rm SrRuO_3$ is cooled through $T_c$ in zero applied magnetic field, a stripe domain structure appears whose orientation is...
Impurity-Induced Bound Excitations on the Surface of Bi2Sr2CaCu2O8 (1999)
Yazdani, Ali, Howald, C. M., Lutz, C. P., Kapitulnik, A., Eigler, D. M.
We have probed the effects of atomic-scale impurities on superconductivity in Bi_{2}Sr_{2}CaCu_{2}O_{8} by performing low-temperature tunneling spectroscopy measurements with a scanning tunneling...
Sisson, D. L., Doettinger, S. G., Kapitulnik, A., Liang, R., Bonn, D. A., Hardy, W. N.
The magnetic field dependence of the specific heat of Zn-doped single crystals of YBa_{2}Cu_3O_{6.95} was measured between 2 and 10 K and up to 8 Tesla. Doping levels of 0, 0.15%, 0.31%, and 1% were...
Ando, Yoichi, Takeya, J., Abe, Yasushi, Nakamura, K., Kapitulnik, A.
The thermal conductivity \kappa of Bi-2212 is measured in pure and Zn-doped crystals as a function of temperature and magnetic field. The in-plane resistivity is also measured on the identical...
Joint Services Electronics Program. (1998)
Harris, S. E., Bloom, D. M., Byer, R. L., Quante, C. F., Kapitulnik, A.
During this period the research activities were organized into four work units: Development of an All-Silicon Integrated Optical Modulator for High Speed Data Communications; Synthetic Nonlinear...
Surface Impedance of the High TC Oxide Superconductors, (1998)
Hylton, T. L., Beasley, M. R., Kapitulnik, A., Carini, John P., Drabeck, Lawrence
We review briefly our results on measurements of the millimeter wave surface impedance of ceramic, thin film and single crystal samples of the high-Tc oxide superconductors. The observed losses and...
Surface Impedance Studies of the High Tc Oxide Superconductors, (1998)
Hylton, T. L., Beasley, M. R., Kapitulnik, A., Carini, John P., Drabeck, Lawrence
We review briefly our results on measurements of the millimeter wave surface impedance of ceramic, thin film and single crystal samples of the high-Tc oxide superconductors. The observed losses and...
Beasley, M. R., Geballe, T. H., Kapitulnik, A.
Progress under AFOSR Contract F49620-92-C-0004 for the period 15 October 1991 to 31 October 1992 is reported. Important results include studies of the grain boundaries in a-axis oriented high-Tc...
Beasley, M. R., Geballe, T. H., Kapitulnik, A.
The aims of this program were to synthesize increasingly high-quality thin film and single crystals of the high Tc and other novel superconductors. We also proposed to study their physical...
Advanced Superconducting Materials and Device Concepts (1998)
Beasley, M. R., Geballe, T. H., Kapitulnik, A.
Various materials and physical processes relevant to the electronic applications of high-Tc superconductivity have been studied. The materials include 123 YBaCuO, 2212 BiSrCaCuO, SrRuO3, SrCuO2,...
Advanced Superconducting Materials and Device Concepts (1998)
Beasley, M. R., Kapitulnik, A., Geballe, T. H., Hammond, R. H.
The properties of advanced materials and phenomena basic to the development of new and/or improved superconducting electronic technologies were studied. These include the conducting magnetic oxide...
Beasley, M. R., Kapitulnik, A., Geballe, T. H.
High-temperature superconducting conductors for power application have been identified as a critical enabling technology for future Air Force systems. Work on the materials science and factors...
Optical Anisotropy of Bi2Sr2CaCu2O8. (1998)
Kim, J. H., Bozovic, I., Mitzi, D. B., Kapitulnik, A.
The optical anisotropy of single crystal Bi2Sr2CaCu2O8 in the 0.08-0.5 eV region is investigated by polarized reflectance measurements. A very large anisotropy is found in this spectral region. The...
Microstructural Interaction of Y2Ba4Cu8O16 Stacking Faults Within YBa2Cu3O(7-x). (1998)
Marshall, A. F., Char, K., Barton, R. W., Kapitulnik, A., Laderman, S. S.
A transmission electron microscopy study of a post-annealed YBa2Cu3O(7-x) thin films shows that extra Cu-O planes within the structure can aggregate as stacking faults to form a defect microstructure...
Dissipation effects on the superconductor-insulator transition in 2-D superconductors (1998)
Results on the superconductor to insulator transition in two-dimensional films are analyzed in terms of coupling of the system to a dissipative bath. Upon lowering the temperature the parameter that...
Thermal Conductivity of the Spin Peierls Compound CuGeO_3 (1998)
Ando, Yoichi, Takeya, J., Sisson, D. L., Doettinger, S. G., Tanaka, I., Feigelson, R. S., ...
The thermal conductivity of the Spin-Peierls (SP) compound CuGeO_3 was measured in magnetic fields up to 16 T. Above the SP transition, the heat transport due to spin excitations causes a peak at...
Non-Fermi liquid behavior of SrRuO_3 -- evidence from infrared conductivity (1998)
Kostic, P., Okada, Y., Schlesinger, Z., Reiner, J. W., Klein, L., Kapitulnik, A., ...
The reflectivity of the itinerant ferromagnet SrRuO_3 has been measured between 50 and 25,000 cm-1 at temperatures ranging from 40 to 300 K, and used to obtain conductivity, scattering rate, and...
Boundary Effects in High-Tc Superconducting. (1997)
This work examines the thermal boundary resistance between high-Tc superconducting films and insulating substrates. In particular we compare c-axis and a-axis films and different oxygen...
Dynamical Phase Transition in a Driven Disordered Vortex Lattice (1996)
Ryu, Seungoh, Hellerqvist, M., Doniach, S., Kapitulnik, A., Stroud, D.
Using Langevin dynamics, we have investigated the dynamics of vortices in a disordered two dimensional superconductor subjected to a uniform driving current. The results provide direct numerical...
Field-driven topological glass transition in a model flux line lattice (1996)
Ryu, Seungoh, Kapitulnik, A., Doniach, S.
We show that the flux line lattice in a model layered HTSC becomes unstable above a critical magnetic field with respect to a plastic deformation via penetration of pairs of point-like disclination...
Effects of Columnar Pins on Flux Line Dynamics (1993)
Ryu, Seungoh, Kapitulnik, A., Doniach, S.
The effects of columnar pins on the flux lines in a model High-Tc superconductor in an applied field are studied through Monte Carlo simulations. An analytic solution for a single line case is...
Fluctuations of the mass of the infinite cluster at percolation (1984)
Kapitulnik, A., Frid, N., Deutscher, G.
We have measured the fluctuations of the mass M of the infinite cluster in percolation, as well as those of fractal objects and discontinuous thin films of Pb. It was found that these fluctuations...
Hall coefficient and conduction in a 2D percolation system (1984)
Palevski, A., Rappaport, M.L., Kapitulnik, A., Fried, A., Deutscher, G.
Complementary measurements of the conductivity and the Hall coefficient in 2D semi-continuous thin films of Au have been performed. It is shown that the sheet conductance near the percolation...
Fluctuations of the mass of the infinite cluster at percolation (1984)
Kapitulnik, A., Frid, N., Deutscher, G.
We have measured the fluctuations of the mass M of the infinite cluster in percolation, as well as those of fractal objects and discontinuous thin films of Pb. It was found that these fluctuations...
Hall coefficient and conduction in a 2D percolation system (1984)
Palevski, A., Rappaport, M.L., Kapitulnik, A., Fried, A., Deutscher, G.
Complementary measurements of the conductivity and the Hall coefficient in 2D semi-continuous thin films of Au have been performed. It is shown that the sheet conductance near the percolation...
Fluctuations of the mass of the infinite cluster at percolation (1984)
Kapitulnik, A., Frid, N., Deutscher, G.
We have measured the fluctuations of the mass M of the infinite cluster in percolation, as well as those of fractal objects and discontinuous thin films of Pb. It was found that these fluctuations...
Hall coefficient and conduction in a 2D percolation system (1984)
Palevski, A., Rappaport, M.L., Kapitulnik, A., Fried, A., Deutscher, G.
Complementary measurements of the conductivity and the Hall coefficient in 2D semi-continuous thin films of Au have been performed. It is shown that the sheet conductance near the percolation...
The effect of crystallinity on the morphology of evaporated Al-Ge thin films (1981)
Kapitulnik, A., Rappaport, M.L., Deutscher, G.
Al-Ge mixtures have been co-evaporated onto glass substrates heated to ∼ 180 °C. At this temperature both the Al and the Ge were crystalline. Electron micrographs show a random structure....
The effect of crystallinity on the morphology of evaporated Al-Ge thin films (1981)
Kapitulnik, A., Rappaport, M.L., Deutscher, G.
Al-Ge mixtures have been co-evaporated onto glass substrates heated to ∼ 180 °C. At this temperature both the Al and the Ge were crystalline. Electron micrographs show a random structure....
The effect of crystallinity on the morphology of evaporated Al-Ge thin films (1981)
Kapitulnik, A., Rappaport, M.L., Deutscher, G.
Al-Ge mixtures have been co-evaporated onto glass substrates heated to ∼ 180 °C. At this temperature both the Al and the Ge were crystalline. Electron micrographs show a random structure....
Coexistence of periodic modulation of quasiparticle states and superconductivity in Bi2Sr2CaCu2O8+δ
Howald, C., Eisaki, H., Kaneko, N., Kapitulnik, A.
In this article we show, using scanning tunneling spectroscopy, the existence of static striped density of electronic states in nearly optimally doped Bi2Sr2CaCu2O8+δ in zero field. This modulation...
Coexistence of periodic modulation of quasiparticle states and superconductivity in Bi2Sr2CaCu2O8+δ
Howald, C., Eisaki, H., Kaneko, N., Kapitulnik, A.
In this article we show, using scanning tunneling spectroscopy, the existence of static striped density of electronic states in nearly optimally doped Bi2Sr2CaCu2O8+δ in zero field. This modulation...