Abstract:

Recently, we presented evidence supporting the existence of a novel 
quantum phase in the vicinity of a metamagnetic quantum critical 
point in Sr3Ru2O7 [1]. In this talk, I describe an extensive 
follow-up project which shows that within this phase, the resistivity 
becomes highly anisotropic when a small in-plane field component is 
added to the large out-of-plane field that promotes the metamagnetic 
transition. The characteristics of this anisotropy will be discussed, 
and compared with previous intriguing work on semiconductor 2DEGs [2].

[1] S.A. Grigera, P. Gegenwart, R. A. Borzi, F. Weickert, A. J. 
Schofield, R.S. Perry, T. Tayama, T. Sakakibara, Y. Maeno, A. G. 
Green & A. P. Mackenzie, Science 306, 1155 (2004) and references therein.

[2] M. P. Lilly, K. B. Cooper, J. P. Eisenstein, L. N. Pfeiffer, and 
K. W. West, Phys. Rev. Lett. 82, 395 (1999).