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2007

3/2-Fermi liquid: the secret of high-Tc cuprates

Baskaran, G.

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Electrical and magnetic properties of underdoped cuprates in the spin gap phase, a precursor to high Tc superconducting state, is riddled with puzzles.

We propose a novel reference state to study this phase, where each hole dopant adds one real holon and one real spinon, with Haldane exclusion statistics $g_{\rm h} =1$ and $g_{\rm s} = {1/2}$, to a fairly inert (pseudo gaped) spin liquid vacuum, resulting in a low density spin-charge liquid.
Spins and charges interact and form a novel collective state, a \textit{3/2-Fermi liquid}.
A holon pairs with a spinon; this hole like fermion composite carries charge +e and a spin-\hlf moment and novel exclusion statistics $g_{\rm hole} = {3/2}$.

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J.C. Campuzano, M.R. Norman and M. Randeria, in Physics of Superconductors, vol. II, Ed. K.H. Bennemann and K.H. Ketterson (Springer, Berlin) 2004, page. 167;
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2007
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