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Observation of three-dimensional Heisenberg-like ferromagnetism in single crystal La0.875Sr0.125MnO3

Physical Review B - Condensed Matter and Materials Physics 68:13 (2003)

Authors:

S Nair, A Banerjee, V Narlikar, D Prabhakaran, T Boothroyd

Abstract:

We report measurements and analysis of the magnetic critical phenomena in a single crystal of La0.875Sr0.125MnO3. The critical exponents associated with the ferromagnetic transition have been determined from ac susceptibility and dc magnetization data. Techniques like the Kouvel-Fischer plots, the modified Arrots plots, and the critical isotherm analysis were used for this purpose. The values of the exponents γ, β, and δ obtained are found to match very well with those predicted for the three-dimensional Heisenberg model. Our results are consistent with recent numerical calculations and suggest that though the double exchange interaction is driven by the motion of conduction electrons, the effective magnetic interaction near the transition is renormalized to a short range one. © 2003 The American Physical Society.
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A μ+SR study of the rare earth antiferromagnet PrO2

JOURNAL OF PHYSICS-CONDENSED MATTER 15:49 (2003) PII S0953-8984(03)70866-2

Authors:

T Lancaster, SJ Blundell, FL Pratt, CH Gardiner, W Hayes, AT Boothroyd
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Magnetic state of Yb in Kondo-lattice YbNi2B2C - art. no. 104407

PHYSICAL REVIEW B 67:10 (2003) ARTN 104407

Authors:

AT Boothroyd, JP Barratt, P Bonville, PC Canfield, A Murani, AR Wildes, RI Bewley
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Structural and superionic properties of Ag+-rich ternary phases within the AgI?MI2 systems

Journal of Physics Condensed Matter IOP Publishing 14:49 (2002) 13579

Authors:

S Hull, DA Keen, P Berastegui
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Spin reorientation transition in the incommensurate stripe-ordered phase of La3/2Sr1/2NiO4

Physical Review B - Condensed Matter and Materials Physics 66:21 (2002) 2124051-2124054

Authors:

PG Freeman, AT Boothroyd, D Prabhakaran, D González, M Enderle

Abstract:

The spin ordering of La3/2Sr1/2NiO4 was investigated by magnetization measurements and by unpolarized and polarized-neutron diffraction. Spin ordering with an incommensurability ε≈0.445 is observed below TSO∼80 K. On cooling, a spin reorientation is observed at 57±1 K, with the spin axes rotating from 52° ±4° to 780°±3°.
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