TY - JOUR
T1 - A change of the Fermi surface in UGe2 across the critical pressure
AU - Settai, R.
AU - Nakashima, M.
AU - Araki, S.
AU - Haga, Y.
AU - Kobayashi, T. C.
AU - Tateiwa, N.
AU - Yamagami, H.
AU - Onuki, Y.
PY - 2002/1/14
Y1 - 2002/1/14
N2 - We carried out the de Haas-van Alphen (dHvA) experiment under pressure for a ferromagnet UGe2. The dHvA frequency of a main dHvA branch named α, that corresponds to a majority up-spin band 40-hole Fermi surface, decreases monotonously with increasing pressure, but in the pressure range from P*c (≃1.2 GPa) to pc (≃1.5 GPa) the dHvA signal disappears completely, where pc and p*c correspond to critical pressures for a Curie temperature TC and the second phase transition temperature T* (<TC), respectively. For p > pc we observed new dHvA branches with large cyclotron masses of 19-64m0, which correspond to main Fermi surfaces in the paramagnetic state.
AB - We carried out the de Haas-van Alphen (dHvA) experiment under pressure for a ferromagnet UGe2. The dHvA frequency of a main dHvA branch named α, that corresponds to a majority up-spin band 40-hole Fermi surface, decreases monotonously with increasing pressure, but in the pressure range from P*c (≃1.2 GPa) to pc (≃1.5 GPa) the dHvA signal disappears completely, where pc and p*c correspond to critical pressures for a Curie temperature TC and the second phase transition temperature T* (<TC), respectively. For p > pc we observed new dHvA branches with large cyclotron masses of 19-64m0, which correspond to main Fermi surfaces in the paramagnetic state.
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U2 - 10.1088/0953-8984/14/1/104
DO - 10.1088/0953-8984/14/1/104
M3 - Letter
AN - SCOPUS:0037074517
SN - 0953-8984
VL - 14
SP - L29-L36
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
IS - 1
ER -