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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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Structural aspects of metamagnetism in Ca_{2-x}Sr_{x}RuO_4 (0.2 < x < 0.5): field tuning of orbital occupation

ArXiv cond-mat/0408015 (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

Abstract:

The crystal structure of Ca_{2-x}Sr_xRuO_4 with 0.2 < x < 1.0 has been studied by diffraction techniques and by high resolution capacitance dilatometry as a function of temperature and magnetic field. Upon cooling in zero magnetic field below about 25 K the structure shrinks along the c-direction and elongates in the a, b planes (0.2 < x < 1.0), whereas the opposite occurs upon cooling at high-field (x = 0.2 and 0.5). These findings indicate an orbital rearrangement driven by temperature and magnetic field, which accompanies the metamagnetic transition in these compounds.
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The structure of intercalated water in superconducting Na$_{0.35}$CoO$_{2}\cdot$1.37D$_{2}$O: Implications for the superconducting phase diagram

(2004)

Authors:

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