Muons and magnets

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Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives

PHYSICAL REVIEW B 88:6 (2013) ARTN 060401

Authors:

JD Wright, MJ Pitcher, W Trevelyan-Thomas, T Lancaster, PJ Baker, FL Pratt, SJ Clarke, SJ Blundell
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Quantum states of muons in fluorides

(2012)

Authors:

JS Möller, D Ceresoli, T Lancaster, N Marzari, SJ Blundell
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Odd-frequency pairing in (TMTSF)2ClO4

(2012)

Authors:

FL Pratt, T Lancaster, SJ Blundell, C Baines
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Three-dimensional Heisenberg spin-glass behavior in SrFe 0.90Co 0.10O 3.0

Physical Review B - Condensed Matter and Materials Physics 86:6 (2012)

Authors:

J Lago, SJ Blundell, A Eguia, M Jansen, T Rojo

Abstract:

The series SrFe 1-xCo xO 3 evolves from spiral antiferromagnetic order to long-range ferromagnetism on increasing Co doping. In the Fe-rich region below the onset of ferromagnetism (x ≤ 0.20), there exists a number of disordered magnetic ground states. Here we present a detailed study of the composition SrFe 0.90Co 0.10O 3, which we find to display quasicanonical spin-glass behavior. The analysis of its freezing transition by means of muon spin relaxation (μSR) spectroscopy and ac and dc susceptibility suggests that the system constitutes a new experimental realization of the three-dimensional Heisenberg spin-glass model with weak random anisotropy. The derived critical exponents are consistent with predictions by Kawamura's chiral driven freezing scenario with a bimodal exchange distribution. © 2012 American Physical Society.
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BF 4 (py = pyridine): Evidence for spin exchange along strongly distorted F⋯H⋯F - bridges in a one-dimensional polymeric chain

Inorganic Chemistry 51:14 (2012) 7520-7528

Authors:

JL Manson, AG Baldwin, BL Scott, J Bendix, RE Del Sesto, PA Goddard, Y Kohama, HE Tran, S Ghannadzadeh, J Singleton, T Lancaster, JS Möller, SJ Blundell, FL Pratt, VS Zapf, J Kang, C Lee, MH Whangbo, C Baines

Abstract:

Figure Persented: [Ni(HF 2)(3-Clpy) 4]BF 4 (py = pyridine) is a simple one-dimensional (1D) coordination polymer composed of compressed NiN 4F 2 octahedra that form chains with bridging HF 2- ligands. In spite of significant distortion of the HF 2- bridge, a quasi-1D antiferromagnetic (AFM) behavior was observed with J FHF = 4.86 K. © 2012 American Chemical Society.
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