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ISIS crystallography on TS-II: what can we do with 60 kW?

Acta Crystallographica Section A: Foundations and advances International Union of Crystallography (IUCr) 61:a1 (2005) c98-c98
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The phase diagram of Ca2-xSrxRuO4: crystal structure and physical properties

Acta Crystallographica Section A: Foundations and advances International Union of Crystallography (IUCr) 61:a1 (2005) c13-c13

Authors:

M Braden, O Friedt, O Schumann, J Baier, P Steffens, M Kriener, T Lorenz, F Bouree, G André, A Gukasov, PG Radaelli, S Nakatsuji, Y Maeno
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Materials Research Society Symposium Proceedings: Preface

Materials Research Society Symposium Proceedings 840 (2005) xi-xii

Authors:

SR Bhatia, PG Khalifah, DJ Pochan, PG Radaelli

The phase-diagram of Ca2-xSrxRuO4: Relation between crystal distortions and physical properties

Materials Research Society Symposium Proceedings 840 (2005) 71-78

Authors:

M Braden, O Friedt, O Schumann, J Baier, P Steffens, M Kriener, T Lorenz, F Bourée, G André, A Gukasov, PC Radaelli, S Nakatsuji, Y Maeno

Abstract:

The phase-diagram of Ca2-x.SrxRuO4 has been studied by several diffraction techniques as function of concentration, temperature, pressure and magnetic field. The substitution of Sr through the smaller Ca induces a series of structural phase transitions with a strong impact on the physical properties. The spin triplet superconductor Sr 2RuO4 exhibits an undistorted crystal structure, and the Mott-insulator Ca2RuO4 strong structural distortions. For intermediate structural distortions samples stay metallic but with outstanding properties. Throughout the phase diagram we find a close coupling between the crystal structure on one side and magnetic and electronic behavior on the other side. © 2005 Materials Research Society.
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Crystal structure of the superconducting layered cobaltate Na xCoO2•yD2O

Journal of Physics Condensed Matter 17:21 (2005) 3293-3304

Authors:

DN Argyriou, PG Radaelli, CJ Milne, N Aliouane, LC Chapon, A Chemseddine, J Veira, S Cox, ND Mathur, PA Midgley

Abstract:

We have used electron diffraction and neutron powder diffraction to elucidate the structural properties of superconducting NaxCoO 2•yD2O over a wide compositional range. Our measurements show that superconducting samples exhibit a number of supercells ranging from to , but the predominant modulation, observed also in the neutron data, is a double hexagonal cell with dimensions 2a × 2a × c. Rietveld analysis reveals that D2O is inserted between CoO 2 sheets to form a layered network of NaO6 triangular prisms. Our model removes the need to invoke a 5 K superconducting point compound and suggests that a solid solution of Na is possible within a relatively constant amount of water y. © IOP Publishing Ltd.
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