Muons and magnets

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Two-gap superconductivity with line nodes in CsCa$_2$Fe$_4$As$_4$F$_2$

(2017)

Authors:

Franziska KK Kirschner, Devashibhai T Adroja, Zhi-Cheng Wang, Franz Lang, Michael Smidman, Peter J Baker, Guang-Han Cao, Stephen J Blundell
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Nodal multigap superconductivity in KCa$_2$Fe$_4$As$_4$F$_2$

(2017)

Authors:

M Smidman, FKK Kirschner, DT Adroja, AD Hillier, F Lang, ZC Wang, GH Cao, SJ Blundell
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Low-field spin dynamics of Cr7Ni and Cr7Ni-Cu-Cr7Ni molecular rings as detected by mu SR

PHYSICAL REVIEW B 96:18 (2017) ARTN 184403

Authors:

S Sanna, P Arosio, L Bordonali, F Adelnia, M Mariani, E Garlatti, C Baines, A Amato, KPV Sabareesh, G Timco, REP Winpenny, SJ Blundell, A Lascialfari
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Proposal for the Detection of Magnetic Monopoles in Spin Ice via Nanoscale Magnetometry

(2017)

Authors:

Franziska KK Kirschner, Felix Flicker, Amir Yacoby, Norman Y Yao, Stephen J Blundell
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Strong coupling of microwave photons to antiferromagnetic fluctuations in an organic magnet

Physical Review Letters American Physical Society 119:14 (2017) 147701

Authors:

Matthias Mergenthaler, Junjie Liu, Jennifer Le Roy, Natalia Ares, Amber Thompson, Lapo Bogani, F Luis, Stephen Blundell, T Lancaster, Arzhang Ardavan, G Andrew D Briggs, Peter J Leek, Edward Laird

Abstract:

Coupling between a crystal of di(phenyl)-(2,4,6-trinitrophenyl)iminoazanium (DPPH) radicals and a superconducting microwave resonator is investigated in a circuit quantum electrodynamics (cQED) architecture. The crystal exhibits paramagnetic behavior above 4 K, with antiferromagnetic correlations appearing below this temperature, and we demonstrate strong coupling at base temperature. The magnetic resonance acquires a field angle dependence as the crystal is cooled down, indicating anisotropy of the exchange interactions. These results show that multi-spin modes in organic crystals are suitable for cQED, offering a platform for their coherent manipulation. They also utilize the cQED architecture as a way to probe spin correlations at low temperature.
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