Projekt

Magnetic dynamics in an antiferromagnet

Udbyder

Vejleder

Sted

København og omegn

In this project, your goal will be to model existing neutron scattering data on the magnetic dynamics (so-called spin waves or magnons) of the honeycomb lattice antiferromagnetic insulator Na2Co2TeO6.

To accomplish this task, you must first get comfortable with the concept of a spin wave or magnon dispersion relation (Chapter 12 in Ref. [1] is a good starting point) and reach an understanding of how a dispersion relation is calculated by the matlab code spinw.  Once you have reached this stage, the next step is to start from the known zigzag magnetic structure of Na2Co2TeO6  (See Figure), and then determine the expected magnetic excitation spectrum for given combinations of nearest, next-nearest, and third-nearest exchange interactions (See chapter 12 in Ref. [1]). Finally, using simple Monte Carlo simulations to perform a powder average, you should compare your theoretical spin wave spectrum to the experimental data (See Figure), and determine the unknown exchange interactions by finding the best fit.

This project is suitable as a bachelor project, but could – in modified form – also be taken as a special course or a master thesis. He project will teach you a lot about magnetism as well as important data analysis techniques.

Useful literature: [1]. C. Kittel, Introduction to Solid State Physics, Wiley (2005); [2] L. Viciu, Q. Huang, E. Morosan, H. W. Sandbergen, N. I Greenbaum, T. McQueen and R. J. Cava, J. Solid State Chem. 180, 1060 (2008);  [3] A. K. Bera, S. M. Yusuf, A. Kumar, C. Ritter, Phys. Rev. B 95, 094424 (2017); [4] https://www.psi.ch/spinw/



Forudsætninger

Quantum mechanics and condensed matter physics (For example, the courses 10102 and 10303). Preferably, you should also have a working knowledge of matlab at the start of the project.

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Kontakt

Virksomhed/organisation

DTU Fysik

Navn

Niels Bech Christensen

Stilling

Seniorforsker

Mail

nbch@fysik.dtu.dk

Vejleder-info

Bachelor i Fysik og Nanoteknologi

Vejleder

Niels Bech Christensen

Type

Bachelorprojekt, Kandidatspeciale, Specialkursus

Skal have taget

10102, 10303

Kandidatuddannelsen i Fysik og Nanoteknologi

Vejleder

Niels Bech Christensen

Type

Bachelorprojekt, Kandidatspeciale, Specialkursus

Skal have taget

10102, 10303

OM DTU

DTU er et teknisk eliteuniversitet med international rækkevidde og standard. Vores mission er at udvikle og nyttiggøre naturvidenskab og teknisk videnskab til gavn for samfundet. 10.000 studerende uddanner sig her til fremtiden, og 5.700 medarbejdere har hver dag fokus på uddannelse, forskning, myndighedsrådgivning og innovation, som bidrager til øget vækst og velfærd.

Find os her

Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby


45 25 25 25

dtu@dtu.dk

CVR-nr. 30 06 09 46

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