TY - JOUR
T1 - Multiple magnetic transitions in a frustrated Heavy-Fermion Antiferromagnet YbAgGe under magnetic field and pressure
AU - Kubo, Hirokazu
AU - Umeo, Kazunori
AU - Katoh, Kenichi
AU - Ochiai, Akira
AU - Takabatake, Toshiro
N1 - Publisher Copyright:
© 2010 The Physical Society of Japan.
PY - 2010/6/1
Y1 - 2010/6/1
N2 - The magnetization M and magnetoresistance of a heavy-fermion antiferromagnet YbAgGe have been measured under pressures P up to 2.7 GPa and magnetic fields B up to 9.5 T. This compound crystallizing in the hexagonal ZrNiAl-type structure with a quasi-kagome lattice of Yb ions has two magnetically ordered phases, namely, phase I (T ≤ TM2 = 0:65 K) and phase II (TM2 ≤ T ≤ TM1 = 0:8 K). With increasing pressure to 2.2 GPa, M (B∥a = 9:5 T) at 0.3K increases from 1.5μB/Yb to 1.8μB/Yb, while M (B∥c = 9:5 T) hardly changes. The metamagnetic transition field in M (B∥a) decreases from 4.6 T for P = 0 to 3.3 T for P = 2:2 GPa. As the pressure exceeds P∗ = 1:6 GPa, both TM and the initial slope of M (B∥a) steeply increase and the area of phase I for Bka expands. These observations suggest that the magnetic frustration of the Yb quasi-kagome lattice is partially suppressed by the application of pressure above 1.6 GPa or magnetic field Bka above 4.5 T. Detailed B-T phase diagrams under pressures up to 2.7 GPa are discussed with respect to the magnetic frustration in YbAgGe.
AB - The magnetization M and magnetoresistance of a heavy-fermion antiferromagnet YbAgGe have been measured under pressures P up to 2.7 GPa and magnetic fields B up to 9.5 T. This compound crystallizing in the hexagonal ZrNiAl-type structure with a quasi-kagome lattice of Yb ions has two magnetically ordered phases, namely, phase I (T ≤ TM2 = 0:65 K) and phase II (TM2 ≤ T ≤ TM1 = 0:8 K). With increasing pressure to 2.2 GPa, M (B∥a = 9:5 T) at 0.3K increases from 1.5μB/Yb to 1.8μB/Yb, while M (B∥c = 9:5 T) hardly changes. The metamagnetic transition field in M (B∥a) decreases from 4.6 T for P = 0 to 3.3 T for P = 2:2 GPa. As the pressure exceeds P∗ = 1:6 GPa, both TM and the initial slope of M (B∥a) steeply increase and the area of phase I for Bka expands. These observations suggest that the magnetic frustration of the Yb quasi-kagome lattice is partially suppressed by the application of pressure above 1.6 GPa or magnetic field Bka above 4.5 T. Detailed B-T phase diagrams under pressures up to 2.7 GPa are discussed with respect to the magnetic frustration in YbAgGe.
KW - Heavy fermion
KW - Magnetic frustration
KW - Magnetic phase diagram
KW - Pressure
KW - YbAgGe
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U2 - 10.1143/JPSJ.79.064715
DO - 10.1143/JPSJ.79.064715
M3 - Article
AN - SCOPUS:78649677406
SN - 0031-9015
VL - 79
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 6
M1 - 064715
ER -