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Experimental and theoretical investigation of low-dimensional spin systems
Université Pierre et Marie Curie - Paris 6, PARIS
Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie - IMPMC
Condensed Matter Physics Physical Chemistry Materials Science 
Full Description:

The study of interacting spins on lattices is a very important branch of theoretical condensed matter physics. This field indeed attracts a lot of attention due to its potential connection with superconductivity, as proposed by P.W. Anderson with the Resonating Valence Bond theory, but also in the search of new, exotic quantum ground states. A major limitation of this field resides, however, in the lack of real material systems that could potentially realize these models.

This PhD is focused on the experimental investigation of the magnetic properties of low dimensional compounds (in particular, the new spin chain Li2OCu2(SO4)2) studied in the laboratory (Collège de France) including the synthesis, doping with nonmagnetic impurities, magnetic susceptibility and specific heat (SQUID,PPMS) measurements and eventually, experiments on large instruments such as neutron diffraction and/or inelastic neutron scattering.

This experimental work will be closely coupled with a thorough theoretical study of the electronic structure of these compounds at the Density Functional Theory level in order to estimate the strengths and signs of thedominant magnetic couplings and therefore, to establish a relevant spin Hamiltonian on the basis of ab initio results. In a second step, the study of the properties of this Hamiltonian will be investigated numerically (through exact diagonalization and Density Matrix Renormalization Group techniques) to understand the nature of theground and excited states, model the thermodynamics and establish the phase diagram of these compounds.

The position is to start in January-October 2015, and it will be filled as soon as a suitable candidate is identified. Applicants should have a Master degree in solid-state physics or chemistry. Basic knowledge in DFT and computer programming would be appreciated.

Inquiries should be made directly to Dr. G. Radtke with a copy of the applicant’s curriculum vitae and a cover letter.

Posted on: 30 January 2015Deadline to apply: 01 October 2015Start Date: 01 September 2015 Duration: 36 months
The Fund category is Public Funding - University and the salary is 20-25k€ annual gross
Doctoral School is Physics of Ile-de-France in the Ile-de-France Region.

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