Teitl: Magnetisation as a function of time and field.

Dyfyniad
Giblin SR (2016). Magnetisation as a function of time and field.. Cardiff University. http://doi.org/10.17035/d.2016.0008219696

Manylion y Set Ddata

Cyhoeddwr: Cardiff University

Dyddiad (y flwyddyn) pryd y daeth y data ar gael i'r cyhoedd: 2016

Fformat y data: .xlxs

Amcangyfrif o gyfanswm maint storio'r set ddata: Llai na 100 megabeit

Nifer y ffeiliau yn y set ddata: 1

DOI : 10.17035/d.2016.0008219696

DOI URL: http://doi.org/10.17035/d.2016.0008219696

Disgrifiad

A non-Ohmic current that grows exponentially with the square root of applied electric field is well known from thermionic field emission (the Schottky effct), electrolytes (the second Wien effct) and semiconductors (the Poole-Frenkel effect). It is a universal signature of the attractive Coulomb force between positive and negative electrical charges, which is revealed as the charges are driven in opposite directions by the force of an applied electric field. Here we apply thermal quenches to spin ice to prepare metastable populations of bound pairs of positive and negative emergent magnetic monopoles at millikelvin temperatures. We find that the application of a magnetic field results in a universal exponential-root field growth of magnetic current, thus confirming the microscopic Coulomb force between the magnetic monopole quasiparticles and establishing a magnetic analogue of the Poole-Frenkel effect. At temperatures above 300 mK, gradual restoration of kinetic monopole equilibria causes the non-Ohmic current to smoothly evolve into the high field Wien effect for magnetic monopoles, as confirmed by comparison to a recent and rigorous theory of the Wien effect in spin ice. Our results extend the universality of the exponential-root field form into magnetism and illustrate the power of emergent particle kinetics to describe far-from equilibrium response in complex systems.

The data comprises magnetisation as a function of time (up to <= 1300s) for different field in spin ice for a range of magenetic field values 0.01 - 0.14T in 0.01T increments.

Research results based upon these data are available at http://doi.org/10.1038/nphys3704