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Pyrochlores Grown by Optical Floating Zone Method

Hanna A. Dabkowska 1,  Kate A. Ross 2,  Katharina Fritsch 2,  Hilary M. Noad 2,  Casey Marjerrison 2,  Jacob P. Ruff 2,  Bruce D. Gaulin 1,2,  Teresa Medina 2,  Robert M. D'Ortensio 2,  Tim Munsie 2,  Jose A. Rodriguez 2,  Graeme M. Luke 2,  Antoni Dabkowski 1

1. Brockhouse Institute for Materials Research, McMaster University, 1280 Main Street West, Hamilton L8S4MI, Canada
2. McMaster University, Department of Physics, 1280 Main Street West, Hamilton L8S 4M1, Canada

Abstract
 In this presentation I would like to stress the importance of high quality, well characterized crystals of complex oxides and their solid solutions for understanding geometrically frustrated magnetism.

My example are cubic rare earth pyrochlores RE2M2O7 (where RE is an rare earth element and M = Ti, Sn, V or Zr), hosting many of the unusual, magnetic, frustrated states which are in the centre of attention of solid state physics.

As the rare earth pyrochlores melt congruently at temperatures above the melting point of Pt, the Optical Floating Zone [OFZ] technique proved to be an efficient, crucible-free method for growth of relatively big single crystals. Using oxidizing or neutral growth atmosphere it was possible to crystallize Y2Ti2O7 – diamagnet, a potential inert matrix for actinides transmutation [1], Tb2Ti2O7 - a spin liquid, with thermal longitudinal spin fluctuations which break spin ice rules [2,3], Ho2Ti2O7 and Dy2Ti2O7 – classical, but still not well enough understood, spin ice systems [4-7], mysterious, frustrated XY antiferromagnet Er2Ti2O7 [8] and Yb2Ti2O7 which displays unexpected, quasi-two-dimensional (2D) magnetic correlations within a cubic lattice environment at low temperatures before entering an exotic disordered ground state below T = 265mK [10-12].

Moreover, Lu2V2O7 melts congruently only in reducing conditions and shows ferromagnetic properties.

To investigate even further physical, crystallographic and optical properties of RE pyrochlores by directionally sensitive methods such as neutron scattering or muons experiments, high quality single crystals are essential.

In the presentation effects of growth conditions and composition on crystal properties of these pyrochlores are discussed.

1. Johnson MB, James DD, Bourque A, Hanna A Dąbkowska; Bruce D Gaulin; J. Solid State Chemistry, 182 (2009) 725-729

2. S. Legl, C. Krey, S. R. Dunsiger, H. A. Dabkowska, J. A. Rodriguez, G. M. Luke, and C. Pfleiderer PRL 109 (2012) 047201

3. K. Fritsch, K. A. Ross, Y. Qiu, J. R. D. Copley, T. Guidi, R. I. Bewley, H. A. Dabkowska, and B. D. Gaulin, Phys. Rev. B 87 (2013) 094410

4. J.A. Quilliam, L.R. Yaraskavitch, H.A. Dąbkowska, B.D. Gaulin, J. Kycia Phys. Rev. B, 83 (2011) 094424

5. H. M. Revell, L. R. Yaraskavitch, J. D. Mason, K. A. Ross, H. M. L. Noad, H. A. Dabkowska, B. D. Gaulin, P. Henelius and J. B. Kycia, Nature Physics 9 (2013) 34–37

6. D. Pomaranski, L. R. Yaraskavitch, S. Meng1, K. A. Ross, H. M. L. Noad, H. A. Dabkowska, B. D. Gaulin and J. B. Kycia, Nature Physics Letters (2013) DOI:10.1038/NPHYS2591 .

7. L. R. Yaraskavitch, H. M. Revell, K. A. Ross, H. Noad, S. Meng, H. A. Dabkowska, B. D. Gaulin, and J. B. Kycia Phys. Rev. B, 85 (2012) 020410

8. J. P. C. Ruff, J. P. Clancy, A. Bourque, M. A. White, M. Ramazanoglu, J. S. Gardner, Y. Qiu, J.

R. D. Copley, M. B. Johnson, H. A. Dąbkowska, and B. D. Gaulin, Phys. Rev. Letters 101 (2008), 147205

9. Craig Bryan, Catherine A. Whitman, Michel B. Johnson, Patrick Murray, Alex Bourque, Hanna A. Dabkowska, Bruce D. Gaulin and Mary Anne White Phys. Rev. B 86 (2012) 054303

10. Ross KA, Ruff JPC, Adams CP, J. S. Gardner, H. A. Dąbkowska, Y. Qiu, J. R. D. Copley, and B. D. Gaulin Phys. Rev. Letters 103 (2009) 227202

11. K.A. Ross, L.R. Yaraskavitch, M. Laver, J.S. Gardner, J. A. Quilliam, S. Meng, J.B. Kycia, D. K. Singh, Th. Proen, H.A. Dabkowska, and B.D. Gaulin Phys. Rev. B 84 (2011) 174442

12. K.A. Ross, Th. Proen, H.A. Dabkowska, J. A. Quilliam, L.R. Yaraskavitch, J.B. Kycia, and B.D. Gaulin Phys. Rev. B 86 (2012) 174424

 

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  2. Crystal growth of oxides by Optical Floating Zone techniques

Presentation: Invited oral at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, Topical Session 1, by Hanna A. Dabkowska
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17

Submitted: 2013-04-15 02:48
Revised:   2013-07-17 22:52