TY - JOUR
T1 - High-field Fermi surface properties in the low-carrier heavy-fermion compound URu 2Si 2
AU - Aoki, Dai
AU - Knebel, Georg
AU - Sheikin, Ilya
AU - Hassinger, Elena
AU - Malone, Liam
AU - Matsuda, Tatsuma D.
AU - Flouquet, Jacques
PY - 2012/7
Y1 - 2012/7
N2 - We performed the Shubnikov-de Haas (SdH) experiments of the low-carrier heavy-fermion compound URu 2Si 2 at high fields up to 34 T and at low temperatures down to 30 mK. All main SdH branches named α, β, and γ were observed for all the measured field-directions (H k ||001] → ||100], ||100] → ||110] and ||001] → ||110]), indicating that they are attributed to the closed Fermi surfaces with nearly spherical shapes. An anomalous split of branch α was detected for the field along the basal plane; the split immediately disappeared by tilting the field to [001] direction, implying a fingerprint of the hidden order state. High-field experiments reveal the complicated field-dependence of the SdH frequencies and the cyclotron masses due to the Zeeman spin-splitting associated with the Fermi surface reconstruction in the hidden order state with small carrier numbers. A new SdH branch named ω with a large cyclotron mass of 25m 0 was detected at high fields above 23 T close to hidden order instabilities.
AB - We performed the Shubnikov-de Haas (SdH) experiments of the low-carrier heavy-fermion compound URu 2Si 2 at high fields up to 34 T and at low temperatures down to 30 mK. All main SdH branches named α, β, and γ were observed for all the measured field-directions (H k ||001] → ||100], ||100] → ||110] and ||001] → ||110]), indicating that they are attributed to the closed Fermi surfaces with nearly spherical shapes. An anomalous split of branch α was detected for the field along the basal plane; the split immediately disappeared by tilting the field to [001] direction, implying a fingerprint of the hidden order state. High-field experiments reveal the complicated field-dependence of the SdH frequencies and the cyclotron masses due to the Zeeman spin-splitting associated with the Fermi surface reconstruction in the hidden order state with small carrier numbers. A new SdH branch named ω with a large cyclotron mass of 25m 0 was detected at high fields above 23 T close to hidden order instabilities.
KW - Cyclotron effective mass
KW - De Haas-van Alphen effect
KW - Fermi surface
KW - Hidden order
KW - Shubnikov-de Haas effect
KW - Spin split
KW - URu Si
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U2 - 10.1143/JPSJ.81.074715
DO - 10.1143/JPSJ.81.074715
M3 - Article
AN - SCOPUS:84863586191
VL - 81
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 7
M1 - 074715
ER -