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SUMMARY:IMX Seminar Series - Probing singlet states in frustrated magnets 
 with muons
DTSTART:20240429T131500
DTEND:20240429T141500
DTSTAMP:20260428T030558Z
UID:6a6c25648707f3f7f8d4eed50e05b94a8a943eeb170e50d1cba557b0
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Stephen Blundell\, Oxford University\, UK\nThe technique
  of muon-spin rotation (μSR) has emerged as one of the most important spe
 ctroscopic techniques in condensed matter physics\, used to study everythi
 ng from superconductors to skyrmions. As I will describe\, it is now possi
 ble to understand the interaction between the muon and its neighbouring sp
 ins in quantitative detail to probe entanglement and decoherence [1] and t
 o characterise the muon site in many different materials with high accurac
 y [2\,3]. An outstanding problem is that many magnetically frustrated syst
 ems exhibit what is known as persistent spin dynamics (PSD) in μSR experi
 ments\, the origin of which has remained mysterious since their discovery 
 in the 1990s. As the temperature is lowered\, the muon-spin relaxation rat
 e rises (as would be expected for the slowing-down of spin fluctuations) b
 ut this rate then saturates at low temperature. To explain this phenomenon
 \, I will describe how muons can couple to singlet states [4] and how this
  can be extended to understand the way muons couple to a variety of system
 s exhibiting highly frustrated magnetism. μSR experiments are usually car
 ried out without resonance\, but I will describe a new project which aims 
 to use insights from magnetic resonance and include them into μSR\, there
 by extending the reach of the technique.\nReferences:\n[1] J. M. Wilkinson
  and S. J. Blundell Phys. Rev. Lett.\, 125\, 087201 (2020)\n[2] S. J. Blun
 dell and T. Lancaster Appl. Phys. Rev.\, 10 \, 021316 (2023)\n[3] P. Bonf
 à\, I. J. Onuorah\, F. Lang\, I. Timrov\, L. Monacelli\, C. Wang\, X. Sun
 \, O. Petracic\, G.Pizzi\, N. Marzari\, S. J. Blundell\, and R. De Renzi\,
  Phys. Rev. Lett. 132\, 046701 (2024)\n[4] S. J. Blundell J. Phys.: Conf. 
 Ser.\, 2462\, 012001 (2023)\n\nBio: Stephen Blundell is a Professor of Phy
 sics in Oxford University\, working in the Department of Physics\, and bas
 ed in the Clarendon Laboratory. He studied physics at Cambridge University
 \, but moved to Oxford after his PhD. He is also a Professorial Fellow of 
 Mansfield College\, Oxford and is the author of several textbooks on diffe
 rent aspects of physics. His research focusses on using muon-spin rotation
  to study a range of organic and inorganic materials\, particularly those 
 showing interesting magnetic\, superconducting\, or dynamical properties. 
 Recently he has been developing a technique called DFT+μ for understandin
 g muon sites\, and is building a capability to use radio frequency and mic
 rowave pulses to control the muon spin during muon-spin rotation experimen
 ts.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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