NMR evidence for a strong modulation of the Bose-Einstein Condensate in BaCuSi${}_2$O${}_6$

S. Kramer, R. Stern, M. Horvatic +3

We present a ${}^{63,65}$Cu and ${}^{29}$Si NMR study of the quasi-2D coupled spin 1/2 dimer compound BaCuSi${}_2$O${}_6$ in the magnetic field range 13-26 T and at temperatures as low as…