TY - JOUR
T1 - Successive magnetic transitions in a frustrated compound YbAgGe
AU - Umeo, Kazunori
AU - Yamane, Kyoutarou
AU - Muro, Yuji
AU - Katoh, Kenichi
AU - Niide, Yuzuru
AU - Ochiai, Akira
AU - Morie, Takaaki
AU - Sakakibara, Toshiro
AU - Takabatake, Toshiro
PY - 2004/3/1
Y1 - 2004/3/1
N2 - Low-temperature properties of a heavy fermion compound YbAgGe have been investigated by electrical resistivity, specific heat and magnetization measurements on a single crystalline sample. This compound, crystallizing in the hexagonal ZrNiAl-type structure, undergoes two magnetic phase transitions at TMI = 0.8 K (second order) and TM2 = 0.65 K (first order). Below TM2, the jump of the resistivity along the a axis indicates gap formation on the Fermi surface along the a axis. The extremely small magnetic entropy of 0.6 J/mol K released at TMI is attributed to the combination of the Kondo effect and magnetic frustration effect. When the magnetic field B ∥ a is increased to 5 T, TMI is depressed to 0 K. At this critical magnetic field, the magnetic susceptibility χ follows the Curie-Weiss law, χ-1 - χ0-1 ∝ T, in a wide temperature range from 0.45 K to 300 K.
AB - Low-temperature properties of a heavy fermion compound YbAgGe have been investigated by electrical resistivity, specific heat and magnetization measurements on a single crystalline sample. This compound, crystallizing in the hexagonal ZrNiAl-type structure, undergoes two magnetic phase transitions at TMI = 0.8 K (second order) and TM2 = 0.65 K (first order). Below TM2, the jump of the resistivity along the a axis indicates gap formation on the Fermi surface along the a axis. The extremely small magnetic entropy of 0.6 J/mol K released at TMI is attributed to the combination of the Kondo effect and magnetic frustration effect. When the magnetic field B ∥ a is increased to 5 T, TMI is depressed to 0 K. At this critical magnetic field, the magnetic susceptibility χ follows the Curie-Weiss law, χ-1 - χ0-1 ∝ T, in a wide temperature range from 0.45 K to 300 K.
KW - Geometrical frustration
KW - Heavy fermion compound
KW - Magnetic transition
KW - YbAgGe
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U2 - 10.1143/JPSJ.73.537
DO - 10.1143/JPSJ.73.537
M3 - Article
AN - SCOPUS:12344287591
VL - 73
SP - 537
EP - 540
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 3
ER -