Lab Home | Phone | Search
Center for Nonlinear Studies  Center for Nonlinear Studies
 Home 
 People 
 Current 
 Affiliates 
 Alumni 
 Visitors 
 Students 
 Research 
 ICAM-LANL 
 Quantum 
 Publications 
 Publications 
 2007 
 2006 
 2005 
 2004 
 2003 
 2002 
 2001 
 2000 
 <1999 
 Conferences 
 Workshops 
 Sponsorship 
 Talks 
 Colloquia 
 Colloquia Archive 
 Seminars 
 Postdoc Seminars Archive 
 Quantum Lunch 
 CMS Colloquia 
 Q-Mat Seminars 
 Q-Mat Seminars Archive 
 Archive 
 Kac Lectures 
 Dist. Quant. Lecture 
 Ulam Scholar 
 Colloquia 
 
 Jobs 
 Students 
 Summer Research 
 Student Application 
 Visitors 
 Description 
 Past Visitors 
 Services 
 General 
 PD Travel Request 
 
 History of CNLS 
 
 Maps, Directions 
 CNLS Office 
 T-Division 
 LANL 
 
Thursday, December 01, 2011
2:00 PM - 2:45 PM
CNLS Conference Room (TA-3, Bldg 1690)

Postdoc Seminar

Orbital and magnetic ordering in ZnV2O4

Yasuyuki Kato
T-4 and CNLS

Spinel group comprise corner sharing tetrahedra and constitute paradigmatic examples of geometrically frustrated lattices. The spinel compound, ZnV2O4, is a Mott insulator with a rather small charge gap that undergoes a structural cubic to tetragonal transition at T=50(K). A magnetic transition at a lower temperature of T=40(K) has also been reported for this compound. The magnetic ordering corresponds to up-up-down-down spin configurations for chains oriented along the yz and zx directions. The origin of this magnetic ordering and the lack of orbital ordering in this material has been an open problem for several decades. The main obstacle was the lack of controlled and unbiased approaches for solving the correlated and frustrated model. I will introduce a novel quantum Monte Carlo method that can simulate the three-band Hubbard model relevant for these materials without generating any serious problem. We will see that this unbiased approach not only explains the observed magnetic ordering but also the lack of orbital ordering.

Host: Kipton Barros, T-4 and CNLS