Relaxation in Spin Ice and New Frustrated Materials
Abstract
My students and I have been working with P. Schiffer, A.P. Ramirez, Q. Huang and J.W. Lynn in recent years in the study of both well-known materials and new materials with geometrically frustrating lattices. Our role in the collaboration has primarily been to synthesize both pure and doped polycrystalline materials and single crystals to help elucidate various aspects of the geometric frustration, and uncover new geometrically frustrated compounds. Our most recent efforts have been concerned with the effect of dilution on the spin relaxation in pyrochlore spin ice compounds and related phases, and we have uncovered a crossover from classical to quantum mechanical relaxation at low temperatures. I will describe some of our work in that area but will also describe our chemical and structural work on new materials with different frustrating lattices than have been studied earlier, and on well known lattices with different kinds of magnetic atoms imbedded in them. References "Quantum-Classical Reentrant Relaxation Crossover in Dy2Ti2O7 Spin-Ice", J. Snyder, B. G. Ueland, H. Karunadasa, J. S. Slusky, R. J. Cava, Ari Mizel, and P. Schiffer, Phys Rev. Lett. 91, 107201 (2003) "Ba2LnSbO6 and Sr2LnSbO6 (Ln = Dy, Ho, Gd) double perovskites: Lanthanides in the geometrically frustrating fcc lattice", H, Karunadasa, Q. Huang, B.G. Ueland, P. Schiffer, and R.J. Cava, Proc. Nat. Acad. Sci. USA 100 8097 (2003)
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MAR.D2001C