Quantum matter in high magnetic fields

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Chemistry of naturally layered manganites (invited)

Journal of Applied Physics AIP Publishing 83:11 (1998) 6379-6384

Authors:

PD Battle, N Kasmir, JE Millburn, MJ Rosseinsky, RT Patel, LE Spring, JF Vente, SJ Blundell, W Hayes, AK Klehe, A Mihut, J Singleton

Abstract:

Experiments on three double-layer (n=2) Ruddlesden–Popper (RP) systems are reported. Doping Sr1.8La1.2Mn2O7 (Tc=126 K) with Nd to form Sr1.8La1.2−xNdxMn2O7 leads to a reduction in Curie temperature for low doping levels (x=0.2), and to behavior reminiscent of Sr1.8Nd1.2Mn2O7 for x⩾0.7. This suggests that it may be possible to control the temperature of maximum magnetoresistance chemically in these phases. The application of pressure (0

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Chemistry of naturally layered manganites (invited)

Journal of Applied Physics AIP Publishing 83:11 (1998) 6379-6384

Authors:

PD Battle, N Kasmir, JE Millburn, MJ Rosseinsky, RT Patel, LE Spring, JF Vente, SJ Blundell, W Hayes, AK Klehe, A Mihut, J Singleton

Abstract:

Experiments on three double-layer (n=2) Ruddlesden–Popper (RP) systems are reported. Doping Sr1.8La1.2Mn2O7 (Tc=126 K) with Nd to form Sr1.8La1.2−xNdxMn2O7 leads to a reduction in Curie temperature for low doping levels (x=0.2), and to behavior reminiscent of Sr1.8Nd1.2Mn2O7 for x⩾0.7. This suggests that it may be possible to control the temperature of maximum magnetoresistance chemically in these phases. The application of pressure (0<P/GPa⩽1.8) is shown to modify the magnetotransport properties of Sr2NdMn2O7 to resemble those of Sr1.9Nd1.1Mn2O7. The changes can be explained by considering the relative strength of ferromagnetic and antiferromagnetic interactions within the material. Finally, the need for careful phase analysis of n=2 RP materials is demonstrated by the misleading magnetization data recorded for a sample of Sr1.8Sm1.2Mn2O7 containing ∼2.8% of an n=∞ perovskite phase.
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Magnetoresistance in high oxidation state iron oxides

Chemical Communications Royal Society of Chemistry (RSC) 0:9 (1998) 987-988

Authors:

PD Battle, MA Green, MJ Rosseinsky, LE Spring, JF Vente, PD Battle, MA Green, J Lago A Mihut, LE Spring, J Singleton
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Stability study of conducting polypyrrole films and polyvinylchloride-polypyrrole composites doped with different counterions

Materials Chemistry and Physics Elsevier 49:2 (1997) 174-178

Authors:

M Brie, R Turcu, A Mihut
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Correlation between the electrochemical synthesis conditions and the optical properties of polypyrrole

Synthetic Metals Elsevier 84:1-3 (1997) 825-826

Authors:

R Turcu, M Brie, G Leising, A Niko, V Tosa, A Mihut, A Bot
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