Events Calendar

Tunable magnetic phase..., Dr. Arash Akbari-Sharbaf

Thursday, January 18, 2018
1:30 pm - 2:30 pm
Physics & Astronomy Building (PAB)
Room: 100
Physics & Astronomy Department

Department of Physics and Astronomy


Dr. Arash Akbari-Sharbaf

Institut Quantique
Université de Sherbrooke

“Tunable magnetic phase from antiferromagnetic order to quantum spin liquid in Mo_3O_13 cluster magnets”


One of the most sought after magnetic phases is the so-called quantum spin liquid (QSL), with the remarkable property that the spins form a highly-entangled quantum ground state that supports fractional excitations known as spinons, as well as other emergent quasi-particles. A study of a tunable phase from an antiferromagnetic order to a QSL phase will be presented for the family of compounds Li_2In_1-xSc_xMo_3O_8 (with x= 0.2, 0.4, 0.6, 0.8, 1). The crystal structure of this series of compounds can be viewed as Mo_3O_13 magnetic clusters arranged on a triangular lattice, or alternatively, as Mo ions arranged on a asymmetric Kagome lattice with two different Mo-Mo bond lengths. These magnetic Mo plans are separated by nonmagnetic layers composed of Li, In, and Sc ions. Substituting Sc with In induces a chemical pressure that alters the ratio of the two Mo-Mo bond lengths, allowing us to tune the localization of unpaired electrons and the magnetic phases in this system. The primary experimental technique we used for exploring the magnetic phases in this series of compounds was muon spin rotation (μSR), and therefore an introduction of the technique will be presented. μSR measurements will be accompanied by other complementary characterization techniques. In order to shed light on our experimental results, a theoretical description of the behaviour of electrons on the asymmetric Kagome lattice will also be presented using an extended Hubbard model.

STUDENTS – after the talk, you’re encouraged to return to the 2nd floor Atrium lounge to meet with the speaker. 
COFFEE – coffee and cookies will be available in the 2nd floor Atrium lounge at 1:15 p.m.
CELL PHONES – as a courtesy to the speaker and audience, please set your cellphones to “silent” mode. Thanks!
Prof. Michael Cottam
Jodi Guthrie - Assistant to the Chair
(519) 661-2111 x.86438
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