TY - JOUR
T1 - Two kinds of cylindrical Fermi surface determined by de Haas-van Alphen experiments in NpCoGa5
AU - Aoki, Dai
AU - Homma, Yoshiya
AU - Shiokawa, Yoshinobu
AU - Yamamoto, Etsuji
AU - Nakamura, Akio
AU - Haga, Yoshinori
AU - Settai, Rikio
AU - Onuki, Yoshichika
PY - 2004/10/1
Y1 - 2004/10/1
N2 - We succeeded in observing de Haas-van Alphen (dHvA) oscillations in an antiferromagnet NpCoGa5 with a tetragonal structure. The dHvA signal was significantly enhanced at higher fields than the metamagnetic transition field Hm (= 43 kOe for H ∥ [001]), where the antiferromagnetic state is changed into the field-induced ferromagnetic (paramagnetic) state. In the paramagnetic state, the Fermi surface was found to consist of two kinds of cylindrical main Fermi surface and small pocket Fermi surfaces. The cyclotron masses of the main Fermi surfaces were considerably large, ranging from 6 to 12 m0. This is the first case where the Fermi surface was determined experimentally in transuranium compounds.
AB - We succeeded in observing de Haas-van Alphen (dHvA) oscillations in an antiferromagnet NpCoGa5 with a tetragonal structure. The dHvA signal was significantly enhanced at higher fields than the metamagnetic transition field Hm (= 43 kOe for H ∥ [001]), where the antiferromagnetic state is changed into the field-induced ferromagnetic (paramagnetic) state. In the paramagnetic state, the Fermi surface was found to consist of two kinds of cylindrical main Fermi surface and small pocket Fermi surfaces. The cyclotron masses of the main Fermi surfaces were considerably large, ranging from 6 to 12 m0. This is the first case where the Fermi surface was determined experimentally in transuranium compounds.
KW - De Haas-van Alphen effect
KW - Fermi surface
KW - NpCoGa
KW - Transuranium compound
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U2 - 10.1143/JPSJ.73.2608
DO - 10.1143/JPSJ.73.2608
M3 - Article
AN - SCOPUS:11344272985
VL - 73
SP - 2608
EP - 2611
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 10
ER -