Quantum matter in high magnetic fields

Research group

Research theme

Sub department

About

Spin freezing and magnetic inhomogeneities in bilayer manganites

(2003)

Authors:

AI Coldea, SJ Blundell, CA Steer, JF Mitchell, FL Pratt
More details from the publisher

Synthesis and Characterization of Ru‐Doped n = 1 and n = 2 Ruddlesden—Popper Manganates.

ChemInform Wiley 33:48 (2002) 7-7

Authors:

Daniel J Gallon, Peter D Battle, Stephen J Blundell, Jonathan C Burley, Amalia I Coldea, Edmund J Cussen, Matthew J Rosseinsky, Christopher Steer
More details from the publisher

Synthesis and characterization of Ru-doped n = 1 and n = 2 Ruddlesden-Popper manganates

Chemistry of Materials 14:9 (2002) 3976-3983

Authors:

DJ Gallon, PD Battle, SJ Blundell, JC Burley, AI Coldea, EJ Cussen, MJ Rosseinsky, C Steer

Abstract:

Polycrystalline samples of Sr3MnRuO7 and Sr2Mn0.5Ru0.5O4 have been synthesized and characterized by neutron diffraction, dc magnetometry, and magnetotransport measurements. They are, respectively, n = 2 and n = 1 members of the Ruddlesden-Popper (RP) An+1BnO3n+1 family; both have tetragonal (I4/mmm) symmetry and a disordered distribution of Ru and Mn over the six-coordinate sites within the perovskite layers of the RP structure. Neither compound shows long-range magnetic order at 2 K, but a spin-glass transition is observed at 16 K (n = 1) or 25 K (n = 2). In the case of the n = 2 compound only, the magnetic transition is accompanied by a reduction in the zero-field electrical conductivity. A maximum magnetoresistance of ∼8% in 14 T is found in both compounds.
More details from the publisher
More details

ChemInform Abstract: Spin, Charge, and Orbital Ordering in the B‐Site Diluted Manganates La2‐xSrxGaMnO6.

ChemInform Wiley 33:14 (2002) no-no

Authors:

PD Battle, SJ Blundell, JB Claridge, AI Coldea, EJ Cussen, LD Noailles, MJ Rosseinsky, J Singleton, J Sloan
More details from the publisher

Growth of large La1-xSrxMnO3 single crystals under argon pressure by the floating-zone technique

J CRYST GROWTH 237 (2002) 806-809

Authors:

D Prabhakaran, AI Coldea, AT Boothroyd, S Blundell

Abstract:

We report the growth of single crystals of La1-xSrxMnO3 (x = 0.0-0.3) by the floating-zone technique in an image furnace under high argon pressure (6-8 atm). Ail excess of Mn in the polycrystalline starting material was used to compensate for the evaporation during growth. single crystals of diameter 8 mm and length 70 mm have been obtained. The phase purity, composition and quality of the crystals were analysed by X-ray diffraction and electron probe microanalysis. We discuss the effect on the crystal growth of varying the amount of Mn excess and of the composition of the growth atmosphere. We also present magnetization and resistivity data for a few of the samples. (C) 2002 Elsevier Science B.V. All rights reserved.
More details from the publisher