Annual progress report of the Department of Solid State Physics 1 January - 31 December 1996

Research in the department is concerned with “Materials with Distinct Physical and Chemical Properties”. The principal activities of the department in the period from 1 January to 31 December, 1996, are presented in this Progress Report. Neutron and X-ray diffraction techniques are used to study a wide variety of problems in condensed matter physics and include: twoand three-dimensional structures, magnetic ordering, heavy fermions, high Tc superconductivity, phase transitions in model systems, precipitation phenomena, and nano-scale structures in various materials. The research in chemistry includes chemical synthesis and physico-chemical investigation of small molecules and polymers, with emphasis on polymers with new optical properties, block copolymers, surface modified polymers, and supramolecular structures. Related to these problems there is work going on in theory, Monte Carlo simulations, computer simulation of molecules and polymers and methods of data analysis. This report contains unpublished results and should not be quoted without permission from the authors. Frontpage illustration: The Mo6Cl14 2cluster forms orange-yellow crystals with the planar trioxatricornane cation (insert). A perspective view of the structure is shown with Mo: Blue; Cl: Green; C: Grey; O: Red. ISBN 87-550-2233-2 ISSN 0106-2840 ISSN 0907-0249 Grafisk Service Risø 1997

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[3]  M. Bergström.  Thermodynamics of Vesicle Formation from a Mixture of Anionic and Cationic Surfactants , 1996 .

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[6]  D. McMorrow.  Artificial magnetic superlattices , 1996 .

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[8]  K. Bechgaard,et al.  Thiaheterohelicenes 2. Synthesis of alkylated thiaheterohelicenes , 1996 .

[9]  Spinodal decomposition of a polystyrene/poly(cyclohexyl acrylate-stat-butyl methacrylate) blend , 1996 .

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[12]  Johnson,et al.  Strain in Nanoscale Germanium Hut Clusters on Si(001) Studied by X-Ray Diffraction. , 1996, Physical review letters.

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[18]  Formation of titled clusters in the electrochemical deposition of copper on n-GaAs(001) , 1996 .

[19]  K. Mortensen.  Structural studies of aqueous solutions of PEO - PPO - PEO triblock copolymers, their micellar aggregates and mesophases; a small-angle neutron scattering study , 1996 .

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[37]  Y. Kitaoka,et al.  Magnetic quantum phase transition in MnSi , 1999 .

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[39]  H. Fuess,,et al.  Thermal treatment of YBa2Cu3−xAlxO6+δ single crystals in different atmospheres and neutron-diffraction study of excess oxygen pinned by the Al substituents , 1996 .

[40]  K. Kjaer,et al.  Head-group variations and monolayer structures of diol derivatives , 1996 .

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[42]  H. Frielinghaus,et al.  Composition Fluctuations and Coil Conformation in a Poly(ethylene−propylene)−Poly(ethylethylene) Diblock Copolymer as a Function of Temperature and Pressure , 1996 .

[43]  Yoshimura,et al.  Raman-active phonons in Bi2Sr2Ca1-xYxCu2O8+d (x=0-1): Effects of hole filling and internal pressure induced by Y doping for Ca, and implications for phonon assignments. , 1996, Physical review. B, Condensed matter.

[44]  K. Mortensen,et al.  Solutes in small amounts provide for lipid-bilayer softness: cholesterol, short-chain lipids, and bola lipids , 1996, European Biophysics Journal.

[45]  P. Schurtenberger,et al.  Cross-Section Structure of Cylindrical and Polymer-Like Micelles from Small-Angle Scattering Data. I. Test of Analysis Methods , 1996 .

[46]  Packing of protein structures in clusters with magic numbers , 1997 .

[47]  J. Hill,et al.  X-ray Resonant Exchange Scattering: Polarization Dependence and Correlation Functions , 1996 .

[48]  P. Gehring,et al.  Observation of two length scales above TN in a holmium thin film , 1996 .

[49]  Henrik M. Rønnow,et al.  Magnetic properties of holmium-erbium alloys , 1996 .

[50]  H. Egsgaard,et al.  Synthesis of deuterated clenbuterol , 1996 .

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[53]  Peterson,et al.  Chiral and herringbone symmetry breaking in water-surface monolayers. , 1996, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[54]  Søren Brunak,et al.  Protein Folds: A Distance-Based Approach , 1995 .

[55]  G. R. Luckhurst,et al.  Orientational ordering in the nematic phase of a thermotropic liquid crystal: A small angle neutron scattering study , 1996 .

[56]  P. Lindgård.  Properties of Magnetic Nano-Particles , 1996 .

[57]  N. Larsen,et al.  Ordering of the Disk-like 2,3,6,7,10,11-Hexakis(hexylthio)triphenylene in Solution and at a Liquid−Solid Interface , 1996 .

[58]  K. Lefmann,et al.  Neutron thermometry of highly polarized silver nuclei , 1996 .

[59]  Shapiro,et al.  Magnetic excitations in the itinerant ferromagnet UFe2. , 1996, Physical review. B, Condensed matter.

[60]  Dosanjh,et al.  Structural phase transitions in bulk YBa2Cu3O6+x with x=0.35 and x=0.36. , 1996, Physical review. B, Condensed matter.

[61]  J. Schneider,et al.  Dynamics of Oxygen ordering in YBa2Cu3O6+x studied by neutron and high-energy synchrotron x-ray diffraction , 1997 .

[62]  J. S. Pedersen,et al.  Polydimethylsiloxane networks at equilibrium swelling : extracted and nonextracted networks , 1996 .

[63]  Nagao,et al.  Crossover from mean field to three-dimensional Ising critical behavior in a three-component microemulsion system. , 1996, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[64]  K. Mortensen,et al.  Identification of an intermediate-segregation regime in a diblock copolymer system , 1996 .

[65]  Peter Schurtenberger,et al.  Scattering Functions of Semiflexible Polymers with and without Excluded Volume Effects , 1996 .

[66]  M. Stamm,et al.  Change of phase behaviour of diblock copolymers upon application of pressure , 1996 .

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[68]  Thorup,et al.  Structural, electrical, magnetic, and optical properties of bis-benzene-1,2-dithiolato-Au(IV) crystals. , 1996, Physical review. B, Condensed matter.

[69]  R. Cowley,et al.  Persistence of helical magnetic order in dysprosium - holmium superlattices , 1996 .

[70]  Baker,et al.  Monte Carlo determination of heteroepitaxial misfit structures. , 1996, Physical review. B, Condensed matter.

[71]  K. Schaumburg,et al.  New 6,6′-disubstituted-binaphthol derivatives as chiral dopants: Synthesis and temperature dependence of molecular conformations , 1996 .

[72]  S. Hvilsted,et al.  Peptide oligomers for holographic data storage , 1996, Nature.

[73]  S. Hvilsted,et al.  Atomic force and optical near‐field microscopic investigations of polarization holographic gratings in a liquid crystalline azobenzene side‐chain polyester , 1996 .

[74]  K. Bechgaard,et al.  Direct Oxidative Cyclization of 1,2-Bis(benzothiophene-2-yl)ethylenes as a Replacement of Photocyclization in the Synthesis of Thiaheterohelicenes , 1996 .

[75]  M. Bergström.  Derivation of Size Distributions of Surfactant Micelles Taking into Account Shape, Composition, and Chain Packing Density Fluctuations , 1996 .

[76]  M. Jørgensen,et al.  Selective Halogen-Lithium Exchange Reaction of Bromine-Substituted 25,26,27,28-Tetrapropoxycalix[4]arene. , 1996, The Journal of organic chemistry.