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[Cu(HF2)2(pyz)]n: A rectangular antiferromagnetic lattice with a spin exchange path made up of two different FHF- bridges

Angewandte Chemie International Edition 50:7 (2011) 1573-1576

Authors:

JL Manson, ML Warter, JA Schlueter, T Lancaster, AJ Steele, SJ Blundell, FL Pratt, J Singleton, RD McDonald, C Lee, MH Whangbo, A Plonczak

Abstract:

The two-dimensional antiferromagnet [Cu(HF2)2(pyz)] n (pyz=pyrazine) has a rectangular lattice (see picture) displaying two types of FHF- bridging modes. The spin exchange through Cu-(FHF)2-Cu is about 90% stronger than through Cu-pyz-Cu, and the 1,1-coordinated FHF-, which is close in nature to F - ⋯ HF, is largely responsible for the exchange. C black, Cu red, F green, H cyan. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

[Cu(HF(2) )(2) (pyrazine)](n) : A Rectangular Antiferromagnetic Lattice with a Spin Exchange Path Made Up of Two Different FHF(-) Bridges.

Angew Chem Int Ed Engl (2011)

Authors:

JL Manson, ML Warter, JA Schlueter, T Lancaster, AJ Steele, SJ Blundell, FL Pratt, J Singleton, RD McDonald, C Lee, MH Whangbo, A Plonczak

[Cu(HF2)2(pyrazine)]n: A Rectangular Antiferromagnetic Lattice with a Spin Exchange Path Made Up of Two Different FHF− Bridges

Angewandte Chemie Wiley (2011) n/a-n/a

Authors:

Jamie L Manson, Michelle L Warter, John A Schlueter, Tom Lancaster, Andrew J Steele, Stephen J Blundell, Francis L Pratt, John Singleton, Ross D McDonald, Changhoon Lee, Myung-Hwan Whangbo, Alex Plonczak

Superconductivity and fluctuating magnetism in quasi-two-dimensional κ-(BEDT-TTF)2Cu[N(CN)2]Br probed with implanted muons

Physical Review B Condensed Matter and Materials Physics 83:2 (2011)

Authors:

T Lancaster, SJ Blundell, FL Pratt, JA Schlueter

Abstract:

A muon-spin relaxation (μ+SR) investigation is presented for the molecular superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br. Evidence is found for low-temperature phase separation throughout the bulk of the material, with only a fraction of the sample showing a superconducting signal, even for slow cooling. Rapid cooling reduces the superconducting fraction still further. For the superconducting phase, the in-plane penetration depth is measured to be λ||=0.47(1)μm, and evidence is seen for a vortex decoupling transition in applied fields above 40 mT. The magnetic fluctuations in the normal state produce a precipitous drop in relaxation rate above 100 K, and we discuss the possible causes for the unusual relaxation that we observe for T>Tc. © 2011 American Physical Society.

[Cu(HF(2))(2)(pyrazine)](n): A Rectangular Antiferromagnetic Lattice with a Spin Exchange Path Made Up of Two Different FHF(-) Bridges.

Angew Chem Int Ed Engl (2011)

Authors:

JL Manson, ML Warter, JA Schlueter, T Lancaster, AJ Steele, SJ Blundell, FL Pratt, J Singleton, RD McDonald, C Lee, MH Whangbo, A Plonczak