Conveners
Science Session: Session 1
- Francis Pratt (STFC)
Science Session: Early Career Presentations
- Mark Telling (STFC)
Science Session: Session 2
- Peter Baker (STFC)
Science Session: Session 3
- Sayani Biswas (ISIS)
Science Session: Session 4
- Adam Berlie (Science and Technology Facilities Council)
MnO has been the skeleton in the closet for the numerous scientists that have been trying to model and understand the μSR results of magnetic oxides [1-8]. In zero field, this material shows a single precession frequency whose origin was hard to reconcile with the proposed muon sites and the possible formation of muonium-like states [4-6]. The picture is further complicated by a time-window...
We are carrying out DFT investigations in conjunction with muSR measurements in order to reveal electronic states of strongly corelated systems, organic molecular systems and battery materials. As our first step, we tried to creproduce muSR results on the mother material of the La-based high-Tc superconducting oxide, La2CuO4 (LCO), which is a typical strongly correlated system. There were some...
Muons are part of natural cosmic radiation but can also be generated at spallation sources for material science and particle physics applications. Recently, pulsed muons have been used to characterize the density of free charge carriers in semiconductors and their recombination lifetime. Muon beam irradiation can also result in the formation of dilute levels of crystal defects in silicon. We...
"The Kagome lattice, characterized by a 2D arrangement of corner-sharing triangles, exemplifies frustration's pivotal role in the emergence of intriguing magnetic phases and quantum spin liquids. The pursuit of materials realizing such quantum states recently led to the discovery of a new family of kagome compounds. These compounds arise from substituting Zn²⁺ with Y³⁺ in the renowned spin...
"Muonic X-ray Emission Spectroscopy is a non-destructive method of elemental analysis, which has recently been used in cultural heritage [1] for finding the chemical composition of artifacts. It is desirable to have a robust way of computationally modelling these experiments, to allow for simpler and more systematic identification of elemental X-ray intensities. When a muon is captured by an...
"V_{1/3}NbS_2, an intercalated transition-metal dichalcogenide, has been investigated previously using a variety of techniques, resulting in different conclusions about its magnetic properties.
We present muon-spin relaxation (μSR) and susceptibility measurements which examine both the static and dynamic magnetic behaviour of V_{1/3}NbS_2. A transition to long-range magnetic order
has been...
For deeper understanding of exotic magnetic phenomena of condensed matters, the muon spin relaxation (µSR) measurement is a powerful experimental technique to probe local magnetic properties of condensed matters. In order to understand SR results, we are approaching to magnetic phenomena of by using the density functional theory (DFT) calculations. I am going to report our recent results of...
This project aims to enhance the understanding of systems studied using the muSR technique by integrating experimental data with simulation. By combining WiMDA and MuSpinSim in real-time communication via sockets, we use atomic variables from simulations as fitting parameters. This approach allows our simulated models to be finely tuned to match experimental observations, enabling the recovery...
In this talk, I will present concrete examples of applications of the MSCP's software tools for the interpretation of a set of concrete muon experiments. The examples will comprise applications in catalysis, magnetic materials and superconductors.
The metal-organic-framework (MOF) compound Cu3(HOTP)2 is a small-gap semiconductor containing a kagome lattice of antiferromagnetically coupled S = 1/2 CuII spins with exchange coupling J~2 K. The J calculated using DFT+U matches experiment and structural modelling shows frustrated layer stacking without long-range order. Muon spin relaxation confirms no magnetic ordering down to 50 mK and...
An important point of applying the muon to battery studies is understanding the muon dynamics within battery materials. To address this issue, our first target system is LiFePO4. The diffusion of Li-ion directly corresponds to the fluctuation rate of the muon. On the other hand, due to the zero-vibration motion of the muon, the implanted muon also has the probability to diffuse inside the...
Deoxyribonucleic acid (DNA) is a complex molecule composed of nucleotides that store genetic information used in the development of all living things. Nitrogenous bases can be either guanine (G), adenine (A), cytosine (C), or thymine (T). The properties of DNA have attracted considerable interest from physicists, chemists, and material scientists due to its capability to act as a medium for...
The FAMU experiment aims to measure the hyperfine splitting (HFS) of the muonic hydrogen in the ground state to get insight into the proton magnetic structure. The FAMU is located at RIKEN-RAL muon facility. Here, the muon beam is directed onto a gas target to form muonic hydrogen. Then, a mid-infrared pulsed laser, specifically developed by the collaboration, is injected in the target. The...
I will give an accessible introduction to unsupervised machine learning and dimensionality reduction, analysing the role they can play in condensed matter physics research. I will then focus on principal component analysis (PCA) as a particularly simple and effective way to achieve this and explain, in practical terms, how one can deploy this technique for the analysis of muon spectroscopy data.
Long charge carrier lifetimes are a key feature of hybrid organic-inorganic perovskites, contributing to their use in highly efficient solar cells. Ionic motion is considered to influence both the carrier lifetimes and the delicate structural stability of the perovskite framework. Our µSR study on (CH3NH3)PbX3 (X = Br, Cl) single crystals investigates these relationships by examining the...
A setup for microwave excitation around 4 GHz has been constructed at the Swiss muon source at PSI. Two classes of experiments are shown, where μSR with such microwave excitation has the potential to obtain new insights. The first example is microwave spectroscopy of muonium centres that are formed after a delay upon muon implantation, which causes dephasing in transverse-field μSR. The second...
Crystalline silicon is used for >90% of photovoltaic solar cells. Electron-hole pairs are produced when light of certain frequencies is absorbed. Some of these charge carriers are lost due to recombination processes in the silicon before they are collected, and the lifetime (or diffusion length) of the carriers defines the quality of a silicon wafer. Photoexcited muon spin spectroscopy...
