Theory of the Nuclear Magnetic 1/T1 Relaxation Rate in Conventional and Unconventional Magnets

This book develops a detailed, quantitative theory of NMR 1/T1 relaxation rates and shows how they could be used to measure the speed at which energy travels in a wide range of magnetic materials.

One of the best ways to "lift the lid" on what is happening inside a given material is to study it using nuclear magnetic resonance (NMR). Of particular interest are NMR 1/T1 relaxation rates, which measure how fast energy stored in magnetic nuclei is transferred to surrounding electrons.

This thesis develops a detailed, quantitative theory of NMR 1/T1 relaxation rates, and shows for the first time how they could be used to measure the speed at which energy travels in a wide range of magnetic materials.

This theory is used to make predictions for"Quantum Spin Nematics", an exotic form of quantum order analogous to a liquid crystal. In order to do so, it is first necessary to unravel how spin nematics transport energy. This thesis proposes a new way to do this, based on the description of quarks in high-energy physics.

Experiments to test the ideas presented are now underway in laboratories across the world.

Nominated as an outstanding Ph.D. thesis by the University of Bristol, UK Theory provides quantitatively correct description of experiments Makes predictions for how to recognise the elusive quantum spin nematic state Includes supplementary material: sn.pub/extras

Inhalt
What is frustrated magnetism and why should you care?.- An introduction to field theory in magnetic systems: the Néel antiferromagnet.- Angle-resolved NMR: a theory of the 1/T1 relaxation rate in magnetic systems.- Theory of the NMR relaxation rate in magnetic Fe pnictides.- Field theoretical description of quantum spin-nematic order.- How to recognise the quantum spin-nematic state.