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inelastic neutron scattering spectra of quantum magnets

Prof Radu Coldea

Professor of Physics

Research theme

  • Quantum materials

Sub department

  • Condensed Matter Physics

Research groups

  • Quantum magnetism and quantum phase transitions
Radu.Coldea@physics.ox.ac.uk
Telephone: 01865 (2)72335
Clarendon Laboratory, room 111.1
  • About
  • Publications

Our research explores the experimental manifestation of cooperative quantum effects in strongly-interacting electron materials in novel regimes of “strong frustration” and “quantum criticality”, when electrons are “on the verge” of order. We probe the microscopic electronic states directly using neutron and synchrotron x-ray scattering on single crystals, combined with magnetometry and in-house heat capacity at mK temperatures and high magnetic field to drive quantum phase transitions. Of recent interest are quantum materials with strong correlations and spin-orbit coupling, where we have discovered unconventional forms of magnetic order and/or spin dynamics, and magnetic quasiparticles with topological properties. 

 

Research interests

quantum materials
quantum phase transitions

Selected publications

Order-by-Disorder from Bond-Dependent Exchange and Intensity Signature of Nodal Quasiparticles in a Honeycomb Cobaltate

Nature Communications
Miska Elliot, Paul McClarty, Dharmalingam PRABHAKARAN, Roger JOHNSON, Helen Walker, Pascal Manuel, Radu COLDEA

Avoided quasiparticle decay and enhanced excitation continuum in the spin-1/2 near-Heisenberg triangular antiferromagnet Ba3CoSb2O9

Physical Review B: Condensed Matter and Materials Physics
David Macdougal, Stephanie Williams, Dharmalingam Prabhakaran, Robert I Bewley, David J Voneshen, Radu Coldea

Glide symmetry breaking and Ising criticality in the quasi-1D magnet CoNb2O6

Proceedings of the National Academy of Sciences National Academy of Sciences 117:41 (2020) 25219-25224
Michele Fava, Radu Coldea, Siddharth Ashok Parameswaran

Unconventional magnetic order on the hyperhoneycomb Kitaev lattice in β-Li2IrO3: Full solution via magnetic resonant x-ray diffraction

PHYSICAL REVIEW B 90:20 (2014) ARTN 205116
A Biffin, RD Johnson, Sungkyun Choi, F Freund, S Manni, A Bombardi, P Manuel, P Gegenwart, R Coldea
See all publications

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