Quantum spin dynamics

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Quantum spin coherence in halogen-modified Cr$_7$Ni molecular nanomagnets

(2014)

Authors:

Danielle Kaminski, Amy L Webber, Christopher J Wedge, Junjie Liu, Grigore A Timco, Inigo J Vitorica-Yrezabal, Eric JL McInnes, Richard EP Winpenny, Arzhang Ardavan
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Synthesis, structure and magnetism of the mixed-valent phosphonate cage, [MnIIMnIII 12(μ4-O)6(μ-OH)6(O3P–t-Bu)10(OH2)2(DMF)4]·[2MeOH·4DMF]

Polyhedron Elsevier 72 (2014) 35-42

Authors:

Vadapalli Chandrasekhar, Joydeb Goura, Kandasamy Gopal, Junjie Liu, Paul Goddard
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Coherent electron spin manipulation in a dilute oriented ensemble of molecular nanomagnets: pulsed EPR on doped single crystals.

Chem Commun (Camb) 50:1 (2014) 91-93

Authors:

Fabrizio Moro, Danielle Kaminski, Floriana Tuna, George FS Whitehead, Grigore A Timco, David Collison, Richard EP Winpenny, Arzhang Ardavan, Eric JL McInnes

Abstract:

Doping a Cr7Zn molecular nanomagnet into a diamagnetic and isostructural host allows pulsed X-band EPR on single crystals, including relaxation and nutation experiments on the S = 3/2 ground state.
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A Microscopic and Spectroscopic View of Quantum Tunneling of Magnetization

Chapter in Molecular Magnets, Springer Nature (2014) 77-110

Authors:

Junjie Liu, Enrique del Barco, Stephen Hill
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Superconducting fluctuations in organic molecular metals enhanced by Mott criticality.

Sci Rep 3 (2013) 3390

Authors:

Moon-Sun Nam, Cécile Mézière, Patrick Batail, Leokadiya Zorina, Sergey Simonov, Arzhang Ardavan

Abstract:

Unconventional superconductivity typically occurs in materials in which a small change of a parameter such as bandwidth or doping leads to antiferromagnetic or Mott insulating phases. As such competing phases are approached, the properties of the superconductor often become increasingly exotic. For example, in organic superconductors and underdoped high-T(c) cuprate superconductors a fluctuating superconducting state persists to temperatures significantly above T(c). By studying alloys of quasi-two-dimensional organic molecular metals in the κ-(BEDT-TTF)₂X family, we reveal how the Nernst effect, a sensitive probe of superconducting phase fluctuations, evolves in the regime of extreme Mott criticality. We find strong evidence that, as the phase diagram is traversed through superconductivity towards the Mott state, the temperature scale for superconducting fluctuations increases dramatically, eventually approaching the temperature at which quasiparticles become identifiable at all.
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