Professor Paolo G. Radaelli OSI: Publications

Prof Radaelli recognised with an MPLS "Excellent Supervisor" Award

Prof Radaelli is one of the 5 Oxford Physicists recognised in the inaugural "Excellence in Research Supervision" award

Read the story at this link

Excellence in Research Supervision

Helical scattering signatures of strain and electronic textures in YbFe2O4 from three-dimensional reciprocal space imaging

(2011)

Authors:

Alexander J Hearmon, Dharmalingam Prabhakaran, Harriott Nowell, Federica Fabrizi, Matthias J Gutmann, Paolo G Radaelli

The polymorphism of ice: five unresolved questions

PHYSICAL CHEMISTRY CHEMICAL PHYSICS 13:41 (2011) 18468-18480

Authors:

Christoph G Salzmann, Paolo G Radaelli, Ben Slater, John L Finney

Direct observation of charge order in triangular metallic AgNiO2 by single-crystal resonant X-ray scattering

(2010)

Authors:

GL Pascut, R Coldea, PG Radaelli, A Bombardi, G Beutier, II Mazin, MD Johannes, M Jansen

Helical spin-waves, magnetic order, and fluctuations in the langasite compound Ba3NbFe3Si2O14

(2010)

Authors:

C Stock, LC Chapon, A Schneidewind, Y Su, PG Radaelli, DF McMorrow, A Bombardi, N Lee, S-W Cheong

Helical spin-waves, magnetic order, and fluctuations in the langasite compound Ba3NbFe3Si2O14

ArXiv 1007.4216 (2010)

Authors:

C Stock, LC Chapon, A Schneidewind, Y Su, PG Radaelli, DF McMorrow, A Bombardi, N Lee, S-W Cheong

Abstract:

We have investigated the spin fluctuations in the langasite compound Ba3NbFe3Si2O14 in both the ordered state and as a function of temperature. The low temperature magnetic structure is defined by a spiral phase characterized by magnetic Bragg peaks at q=(0,0,tau ~ 1/7) onset at TN=27 K as previously reported by Marty et al. The nature of the fluctuations and temperature dependence of the order parameter is consistent with a classical second order phase transition for a two dimensional triangular antiferromagnet. We will show that the physical properties and energy scales including the ordering wavevector, Curie-Weiss temperature, and the spin-waves can be explained through the use of only symmetric exchange constants without the need for the Dzyaloshinskii-Moriya interaction. This is accomplished through a set of ``helical" exchange pathways along the c direction imposed by the chiral crystal structure and naturally explains the magnetic diffuse scattering which displays a strong vector chirality up to high temperatures well above the ordering temperature. This illustrates a strong coupling between magnetic and crystalline chirality in this compound.

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