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Adsorption-site mixing at a continuous order-disorder phase transition

Schwennicke, C.; Sandhoff, M.; Sklarek, W.; Jürgens, D.; Pfnür, Herbert (College Park, MD : American Physical Society, 1995)

The temperature-dependent probability of occupation of the two threefold-coordinated adsorption sites was determined for the system S/Ru(0001) at a coverage of 0.33, analyzing energy-dependent intensity curves [I(E) curves] ...
Continuous order-disorder phase transitions of the p(2×2) and (3 × 3) R30°superstructures of sulfur on Ru(001): Effective critical exponents and finite-size effects

Sokolowski, M.; Pfnür, Herbert (College Park, MD : American Physical Society, 1994)

Critical properties of the two-dimensional order-disorder phase transitions of the p(2×2) and the (3 × 3) R30°superstructures of sulfur chemisorbed on Ru(001) were determined by spot-profile analysis using high-resolution ...
Critical scattering at the order-disorder phase transition of Si(111)-√3×√3R30°-Au surface: A phase transition with particle exchange

Nakajima, Y.; Voges, C.; Nagao, T.; Hasegawa, S.; Klos, G.; Pfnür, Herbert (College Park, MD : American Physical Society, 1997)

The Si(111)-√3×√3-Au phase, which coexists with three-dimensional islands of excess Au at coverages above 1 monolayer and at temperatures above 700 K, is shown to undergo a temperature driven order-disorder phase transition ...
Depinning transitions between adsorbate chains coupled by Friedel oscillations

Godzik, G.; Block, T.; Pfnür, Herbert (College Park, MD : American Physical Society, 2003)

The low coverage phase transitions of the p(8×1) and the p(5×1) chain structures of the Sr/Mo(112) system have been investigated with low-energy electron diffraction (LEED) at constant coverages. It turns out that both ...
Effect of oxygen impurities on the critical properties of the (2×2)-2H/Ni(111) order-disorder phase transition

Budde, K.; Schwenger, L.; Voges, C.; Pfnür, Herbert (College Park, MD : American Physical Society, 1995)

Critical behavior of the two-dimensional order-disorder phase transition of the (2×2)-2H structure on Ni(111) was studied by high-resolution low-energy electron-diffraction experiments, both for the pure system and with ...
Effect of random quenched impurities on the critical behavior of a four-state Potts system in two dimensions: An experimental study

Schwenger, L.; Budde, K.; Voges, C.; Pfnür, Herbert (College Park, MD : American Physical Society, 1994)

Critical behavior of the order-disorder phase transition of the (2×2)-2H structure on Ni(111) was investigated for the pure system and in the presence of 0.3%-3% of a monolayer of preadsorbed atomic oxygen. Depending on ...
Experimental determination of the phase-transition critical exponents and by integrating methods

Voges, C.; Pfnür, Herbert (College Park, MD : American Physical Society, 1998)

Integrating methods in low-energy electron diffraction—turning the instrument to low resolution in k∥—can reliably be used to study critical properties of continuous two-dimensional phase transitions and to determine ...
From Spin Glasses to Negative-Weight Percolation

Hartmann, Alexander K.; Melchert, Oliver; Norrenbrock, Christoph (Basel : MDPI, 2019)

Spin glasses are prototypical random systems modelling magnetic alloys. One important way to investigate spin glass models is to study domain walls. For two dimensions, this can be algorithmically understood as the calculation ...
Introducing the crystalline phase of dicalcium phosphate monohydrate

Lu, Bing-Qiang; Willhammar, Tom; Sun, Ben-Ben; Hedin, Niklas; Gale, Julian D.; Gebauer, Denis (Berlin : Nature Research, 2020)

Calcium orthophosphates (CaPs) are important in geology, biomineralization, animal metabolism and biomedicine, and constitute a structurally and chemically diverse class of minerals. In the case of dicalcium phosphates, ...
Model studies of methanol selective oxidation over copper catalysts

Zhou, Ling (Hannover : Universität, 2005)

[no abstract]
On the Thermal Capacity of Solids

Feldhoff, Armin (Basel : MDPI, 2022)

The term thermal capacity appears to suggest a storable thermal quantity. However, this claim is not redeemed when thermal capacity is projected onto “heat”, which, like all energy forms, exits only in transit and is not ...
Phase transitions in the adsorption system Li/Mo(112)

Fedorus, A.; Kolthoff, D.; Koval, V.; Lyuksyutov, I.; Naumovets, A.; Pfnür, Herbert (College Park, MD : American Physical Society, 2000)

Experimental studies of the phase transitions in the adsorption system Li/Mo(112) are presented. This system is a model system for highly anisotropic interactions. From measurements of the half-widths of the low-energy ...
Phase transitions of the striped domain-wall phases of S on Ru(0001)

Sokolowski, M.; Pfnür, Herbert (College Park, MD : American Physical Society, 1995)

Atomic sulfur chemisorbed on Ru(0001) forms a striped network of domain walls (DW's) at coverages above completion of a commensurate (3 × 3) R30°structure (θ>0.333). At high coverages (θ=0.48), this DW network transforms ...
Structural modifications of quasi-one-dimensional submonolayers by impurity doping

Godzik, G.; Block, T.; Pfnür, Herbert (College Park, MD : American Physical Society, 2004)

In this study, carried out by analysis of intensities and spot profiles in low energy electron diffraction, we investigated the influence of electronegative oxygen atoms as dopants on the long range order, the thermal ...
Surface structure and reactivity of platinum in the oxidation of ammonia

Zeng, Yingfeng (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2008)

[no abstract]
Tensor-network approach for quantum metrology in many-body quantum systems

Chabuda, Krzysztof; Dziarmaga, Jacek; Osborne, Tobias J.; Demkowicz-Dobrzański, Rafał (London : Nature Publishing Group, 2020)

Identification of the optimal quantum metrological protocols in realistic many particle quantum models is in general a challenge that cannot be efficiently addressed by the state-of-the-art numerical and analytical methods. ...
Untersuchungen zum Phasenumwandlungs- und Ordnungsparameterverhalten ferroelastischer Systeme mittels der lokalen Sonden Raman-, IR- und NMR-Spektroskopie

Engelhardt, Astrid (Hannover : Universität, 2003)

[no abstract]

Now showing items 1-17 of 17

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