Phys. Rev. Lett. 94, 096802 (2005) [4 pages]Spin Degree of Freedom in the ν=1 Bilayer Electron System Investigated by Nuclear Spin RelaxationReceived 19 October 2004; published 10 March 2005 The nuclear-spin-relaxation rate 1/T1 has been measured in a bilayer electron system at and around total Landau level filling factor ν=1. The measured 1/T1, which probes electron spin fluctuations, is found to increase gradually from the quantum Hall (QH) state at low fields through a phase transition to the compressible state at high fields. Furthermore, 1/T1 in the QH state shows a noticeable increase away from ν=1. These results demonstrate that, as opposed to common assumption, the electron spin degree of freedom is not completely frozen either in the QH or the compressible states. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.096802
DOI:
10.1103/PhysRevLett.94.096802
PACS:
73.43.Nq, 73.20.–r, 73.21.Fg
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