2007/07/31 by Suchitra E. Sebastian, N. Harrison, P. Sengupta +7 · 1 citation
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1073/pnas.0804320105
published as PNAS 105, 20157 (2008) · 14 pages, 3 figures
arxiv created 2008/04/07 · arxiv updated 2011/12/08
We measure a sequence of quantum Hall-like plateaux at 1/q: 9 >= q >= 2 and p/q = 2/9 fractions in the magnetisation with increasing magnetic field in the geometrically frustrated spin system SrCu2(BO3)2. We find that the entire observed sequence of plateaux is reproduced by solving the Hofstadter problem on the system lattice when short-range repulsive interactions are included, thus providing a sterling demonstration of bosons confined by a magnetic and lattice potential mimicking fermions in the extreme quantum limit.