On the doping variation of the pseudogap in high-T-c cuprates

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Metal–organic frameworks (MOFs) are promising materials for gas adsorption and separation owing to their tunable structures and large capacities. Given the ubiquity of water vapor in the environment, predicting water adsorption within MOFs is critical, but the classical force fields, such as the UFF, often fail. To overcome this problem, we propose a strategy to fine-tune a machine learning potential (MLP) from the pretrained MACE model for water adsorption within MOFs. We test our strategy on a dataset of

Cellulose is composed of tightly packed glucan chains that give it superior strength but render it recalcitrant to breakdown. The presence of dislocations susceptible to degradation within cellulose fibrils has been postulated for decades, but they have never been directly visualized. We have developed a super-resolution fluorescence microscopy approach to visualize alternating crystalline and disordered regions within bacterial cellulose fibrils. The measured size of crystalline regions ranges from 40 – 40

This thesis investigates the fundamental physics and computational modeling of quantum thermal transport in crystalline systems, focusing on regimes where established theoretical approaches face intrinsic limitations. Thermal transport, studied for decades, remains an active research area due to the shrinking size and increasing complexity of materials and devices, making microscopic and mesoscopic heat propagation both a theoretical challenge and a practical necessity. Central to this work is the study of

Background: Eating disorders (EDs) are serious psychiatric disorders characterised by impairments in neurocognition and altered brain structure. To date the majority of studies have investigated these in acutely ill or recovered individuals. Studying children at familial high risk (FHR) for psychiatric disorders allows investigating vulnerability traits or trait markers that may be present before disorder onset. Our study is the first one to examine executive function and brain structure in girls at FHR for

Background. The small characteristic sizes (in the range of 102 - 103 μm) of Microstructured reactors (MSR) lead to very high specific interfacial area which, in turn, increases heat- and mass transfer efficiency. However, for quasi instantaneous exothermic reactions, the overall reaction kinetics in MSR is strongly influenced by mixing. The characteristic time of the latter phenomenon varies from millisecond to seconds depending on the operating conditions used. If mixing is the rate determining step for h

This report is the summary of what has been done for my TP4 project in second semester at "laboratory of quantum magnetism (LQM)" under the supervision Prof.H.Ronnow. This project is the continuation of first semester regarding to measurement of specific heat of BCPO. The subject is to measure and compare the specific heat of two samples, BiCu2PO6 and BiZn2PO6 under applying pressure. This comparison leads to understanding the change in magnetic structure of BCPO, which has Spin-Gap, after replacing its Cu

The authors calculate energy levels associated with the oxygen vacancy in monoclinic HfO2 using a hybrid density functional which accurately reproduces the experimental band gap. The most stable charge states are obtained for varying Fermi level in the HfO2 band gap. To compare with measured defect levels, they determine total energy differences specific to the considered experiment. Their results show that the oxygen vacancy can consistently account for the defect levels observed in (Poole-Frenkel-type) tr

We have optimized laser ablation thin film deposition and transfer procedures within synchrotron vault, specifically to perform angle-integrated and angle-resolved photoemission spectroscopy (ARPES) on high-T-c and related films without cleaving the samples. However, the chain-containing phases like YBCO-123 easily loose surface oxygen and do not exhibit stable Fermi edge, hence are not suitable for ARPES studies. Direct in situ ARPES studies on strained LSCO-214 films show striking strain effects on the el

The resonant Rayleigh scattering dynamics of excitons in single GaAs quantum wells is investigated. The deviation of the measured intensity from the ideal ensemble average is analyzed as a function of the speckle ensemble size. The influence of the amplitude and correlation length of the exciton disorder potential is traced using a series of samples with varying inhomogeneous broadening and interface island sizes. The experimental data are compared with theoretical predictions using exciton states of spatia

This study has characterized the energetics of both the liquid state and the solid state of two commercially available epoxy resins: a DGEBA- and a TGMDA-based epoxy system. The surface properties of the liquid epoxies were evaluated by wetting measurements using a dynamic contact angle analysis (DCA). The Lifshitz-van der Waals components of the surface tension were found to be similar for both epoxy systems, while the acid-base components were found to be slightly different. Two different techniques were

InP films have been deposited on amorphous sapphire substrate by means of the metallorganic chemical vapour deposition technique with and without PH3/H-2 plasma preactivation. Polycrystalline materials, having average grain sizes of about 40 nm, which, however, vary according to the growth parameters, were obtained. The structural and compositional disorder strongly influence the optical and electrical properties. The most structurally disordered films present the largest photoluminescence (PL) efficiency a

Superconductivity in high-Tc cuprates is particularly sensitive to disorder due to the unconventional d-wave pairing symmetry. We investigated effects of disorder on the spectral properties of Bi2Sr2CaCu2O8+x high-Tc superconductor. We found that already small defect densities suppress the characteristic spectral signature of the superconducting state. The spectral line shape clearly reflects new excitations within the gap, as expected for de

The effects of background n- and p-type doping on Zn diffusion in GaAs/AlGaAs multilayered structures are investigated by secondary-ion-mass spectrometry and photoluminescence measurements. Zn diffusions are performed at 575 degrees C into Si-doped, Be-doped, and Si/Be-codoped identical GaAs/Al0.2Ga0.8As multiple-quantum-well structures. The results obtained by secondary-ion-mass spectrometry show that the Zn diffusion induces an enhancement of Be out-diffusion and the disordering of all structures. The eff

Doping Bi2Sr2Ca1Cu2O8+y with Co causes a superconductor-insulator transition. We study correlations between changes in the electrical resistivity rho(ab)(T) and the electronic bandstructure using identical single crystalline samples. For undoped samples the resistivity is linear in temperature and has a vanishing residual resistivity. In angle resolved photoemission these samples show dispersing band-like states. Co-doping decreases Te and causes and increase in the residual resistivity. Above a threshold C

We report on striking sensitivity of the superconducting properties of ion-beam sputtered YBa2Cu3O6.9 films to the lattice disorder (induced by varying growth temperatures). Tc decreases with increasing disorder, while the width of the resistive transition and the normal state resistivity increase. We give a quantitative significance to this trend by expressing the degree of the disorder in terms of the lattice coherence length rc that is extracted from the width of X-ray diffraction rocking curves. We find

A comparative study has been made of iodine-intercalated Bi2Sr2Ca1Cu2Ox single crystal and 1 atm O2 annealed Bi2Sr2Ca1Cu1Ox single crystal using an AC susceptibility measurement, X-ray photoemission (XPS) and angle-resolved ultraviolet photoemission spectroscopy (ARUPS). The AC susceptibility measurement indicates that O2 doped samples studied have a T(c) of 84 K, whereas T(c) of the iodine-doped samples studied are 80 K. XPS Cu 2p core-level data establish that the hole concentration in the CuO2 planes is

GaAs/AlxGa1-xAs multiple-quantum-well (MQW) structures with identical well thicknesses but with different Al contents x in the barrier (x almost-equal-to 0.1, 0.2, 0.45, and 1) were grown by molecular-beam epitaxy to study the impurity-induced disordering mechanism. The disordering of the structures is observed directly by transmission electron microscopy on cleaved wedges of the sample, by the secondary electron imaging mode of scanning electron microscopy, and by secondary-ion-mass spectroscopy after Zn d

A study of the formation of In- and Au-GaAs(100) interfaces is reported. The metal overlayers are deposited in ultrahigh vacuum on room-temperature (RT) and low-temperature (LT) (100)GaAs grown by molecular-beam epitaxy, following the evaporation of a protective As capping layer from the semiconductor surface. High-resolution photoemission spectroscopy and low-energy electron diffraction are used to characterize these interfaces. In forms a two-dimensional interface layer plus clusters at RT and LT, with re

Four models taken from the literature, which permit calcn. of heats of combustion from elemental anal., are evaluated from a theor. point of view. In order to obtain exptl. values of heat of combustion with a higher degree of accuracy than that in the literature, an improved sample prepn. technique based on lyophilization of microbial biomass was developed. Heat of combustion was detd. by direct measurement in a calorimeter and compared to calcd. values from each of the literature models. Giese's formula pr

A dynamic simulation method was applied to det. the state of a stagewise gas absorption column. The unsteady state heat and mass balances for each real stage were integrated up to the steady state, considering all possible heat effects. The new method resulted in stable convergence of the 2-point boundary value problem. Earlier studies of the influences of typical operating and system variables on the capacity of an absorber were extended. The transport capacity of the gas phase for heat, solvent evapn., th

On the doping variation of the pseudogap in high-T-c cuprates

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Generalized Machine Learning Potentials for Water Adsorption in Al-Based Metal–Organic Frameworks Considering Framework Flexibility

Direct super-resolution imaging of the disordered and crystalline nanostructure of bacterial cellulose fibrils

Theoretical and computational advances in quantum and hydrodynamic thermal transport

Neurobiology and cognition in offspring at high-risk of eating disorders: exploring imaging-derived trait markers

Effect of hot spots in microstructured reactors on product distribution during quasi-instantaneous exothermic reactions

AC-measurements of specific heat in BCPO

Oxygen vacancy in monoclinic HfO2: A consistent interpretation of trap assisted conduction, direct electron injection, and optical absorption experiments

Direct photoemission spectroscopy and electronic properties of in situ grown, strained high-T-c and related oxide films

Resonant Rayleigh scattering dynamics of excitons in single quantum wells

Characterization of epoxy resin surface energetics

Luminescence study of the disorder in polycrystalline InP thin films

Defect-induced changes in the spectral properties of high-Tc cuprates

Effects of background n- and p-type doping on Zn diffusion in GaAs AlGaAs multiple-quantum-well structures

Localization Effects in Transition-Metal Doped Bi2sr2cacu2o8+Y High-Temperature Superconductors

Effects of lattice disorder on the superconducting properties of YBa2Cu3O6.9 films

Effect of Iodine Doping on Bi2Sr2Ca1Cu2Ox - Charge-Transfer or Interlayer Coupling

Self-Interstitial Mechanism for Zn Diffusion-Induced Disordering of Gaas/Alxga1-Xas (X=0.1-1) Multiple-Quantum-Well Structures

Formation of Interfaces between In and Au and GaAs(100) Studied with Soft-X-Ray Photoemission Spectroscopy

The relationship between elemental composition and heat of combustion of microbial biomass

Gas absorption with heat effects. I. New computational method