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Magnetic Order Induced by Fe Doping in the Intermediate Valence System β-YbAlB4
K. Kuga,S. Nakatsuji 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have succeeded in doping Fe at the Al site in the intermediate valence and quantum criticalmaterial β-YbAlB4 up to 6%. Our measurements of the magnetization and the specific heat for-YbAl0.94Fe0.06B4 show magnetic ordering at 10 K. The antiferromagnetic Weiss temperature of88 K, which is smaller than the 110 K for β-YbAlB4, indicates that Fe doping suppresses the Kondotemperature and induces magnetism, driving the system away from the quantum critical point.
Y. H. Matsuda,T. Nakamura,K. Kuga,S. Nakatsuji,S. Michimura,T. Inami,N. Kawamura,M. Mizumaki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The valence state of Yb ions in β-YbAlB4 and its polymorph α-YbAlB4 has been investigated byusing X-ray absorption and emission spectroscopy in SPring-8 at temperatures from 2 to 280 K. Theobserved Yb valence is 2.78 ± 0.01 in β-YbAlB4 at 2 K by using the X-ray emission spectroscopy. The valence is found to gradually increase with increasing temperature toward the trivalent state,and the characteristic temperature of the valence fluctuation is expected to be about 290 K. Wealso found a small increase in the Yb valence ( 0.002) by applying a magnetic field of 32 T at40 K to β-YbAlB4.