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Crystal structure of the superconducting layered cobaltate NaxCoO2•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
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Structural anomalies and multiferroic behavior in magnetically frustrated TbMn2O5.

Phys Rev Lett 93:17 (2004) 177402

Authors:

LC Chapon, GR Blake, MJ Gutmann, S Park, N Hur, PG Radaelli, S-W Cheong

Abstract:

We have studied the magnetostructural phase diagram of multiferroic TbMn2O5 as a function of temperature and magnetic field by neutron diffraction. Dielectric and magnetic anomalies are found to be associated with steps in the magnetic propagation vector, including a rare example of a commensurate-incommensurate transition on cooling below 24 K, and in the structural parameters. The geometrically frustrated magnetic structure is stabilized by "canted antiferroelectric" displacements of the Mn3+ ions, an example of the magnetic Jahn-Teller effect. The Tb moments order ferromagnetically at low temperatures in an applied field, while the Mn magnetic structure is largely unchanged.
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Structural anomalies and multiferroic behavior in magnetically frustrated TbMn2O5

Physical Review Letters 93:17 (2004) 1-177402

Authors:

LC Chapon, GR Blake, MJ Gutmann, S Park, N Hur, PO Radaelli, SW Cheong

Abstract:

The magnetostructural phase diagram of multiferroic TbMn2O 5 was investigated as a function of temperature and magnetic field by neutron diffraction. It was observed that dielectric and magnetic anomalies were associated with steps in the magnetic propagation vector, and in the structural parameters. The geometrically frustrated magnetic structure were found to be stabilized by "canted antiferroelectric" displacements of the Mn3+ ions. It was found that the Tb moments order ferromagnetically at low temperatures in an applied field, while the Mn magnetic structure is largely unchanged.
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Diffraction probes of charge and orbital ordering: from perovskites to geometrically frustrated systems

Acta Crystallographica Section A: Foundations and advances International Union of Crystallography (IUCr) 60:a1 (2004) s58-s58
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Structural aspects of metamagnetism in Ca_{2-x}Sr_{x}RuO_4 (0.2 < x < 0.5): field tuning of orbital occupation

(2004)

Authors:

M Kriener, P Steffens, J Baier, O Schumann, T Zabel, T Lorenz, O Friedt, R Mueller, A Gukasov, P Radaelli, P Reutler, A Revcolevschi, S Nakatsuji, Y Maeno, M Braden
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