39474-06-1Relevant academic research and scientific papers
Pressure effect on valence fluctuation and magnetic ordering in YbPd
Mitsuda,Yamada,Sugishima,Wada
, p. 3002 - 3004 (2009)
The cubic CsCl type compound YbPd is known to be a valence fluctuating compound and to undergo four phase transitions at 0.5, 1.9, 105 and 125 K. In the present study, we focus on pressure effect on the transitions. The transitions at T1 = 105
ON THE MIXED VALENCE BEHAVIOUR OF YTTERBIUM IN THE COMPOUND YbPd.
Iandelli,Olcese,Palenzona
, p. 317 - 324 (1980)
The expansion coefficient and the magnetic susceptibility in the compound YbPd were measured at various temperatures. The data obtained were compared with those for TmPd, LuPd, and CaPd. From these measurements it is possible to state that the compound YbPd contains ytterbium in a mixed valence state. The quantity of trivalent ytterbium increases slowly with temperature from 67% to 89% in the range 100-1000 K.
Neutron diffraction studies on valence ordering compound YbPd
Oyama, Kohei,Sugishima, Masaki,Tanabe, Kousuke,Mitsuda, Akihiro,Wada, Hirofumi,Ohoyama, Kenji,Matsukawa, Takeshi,Yoshida, Yukihiko,Hoshikawa, Akinori,Ishigaki, Toru,Iwasa, Kazuaki
, (2018/10/23)
The magnetic structure of YbPd was determined for a newly synthesized strain-free sample by neutron diffraction techniques. The sinusoidal magnetic structure characterized by an incommensurate wave vector k = (0.080 0 0.32) is observed in the magnetic-ordered phase between T3 = 1.9 K and T4 = 0.5 K, which is composed of the magneticmoment amplitude of 0.3 μB parallel to the a-axis in the tetragonal crystal-structure phase. The modulated magnetic structure is consistent with the previously proposed Yb-ion valence ordered structure appearing below T2 = 105 K, which consists of the periodic arrangement of magnetic and nonmagnetic Yb ions.
Detailed investigation of elastic properties of YbPd single crystal
Nakanishi, Yoshiki,Kamiyama, Toru,Deto, Kazuhisa,Shichinomiya, Fumitaka,Kashiwazaki, Reiko,et al.
, p. 1 - 3 (2011/11/30)
We have investigated elastic properties of the mixed-valent intermetallic compound YbPd by means of ultrasonic measurements on the single-crystals. A pronounced elastic anomaly (elastic softening) was observed at around the transition temperature T1'130 K with a significanthysteresis, being indicative of a first-order phase transition. Further more, it was found that the elastic anomaly showing up around T1 was hardly affected by application of a magnetic field, suggesting the non-magnetic origin. We can analyze quantitatively the temperature dependence of all measured elastic modes C11 and C44with a Jahn-Teller formula. Our findings suggest that the pronounced el astic softening toward T1 will enable us to predict the possible charge ordering origin.
Effects of magnetic field, pressure and dilution of Yb on phase transitions in valence fluctuating compound YbPd
Sugishima, Masaki,Yamada, Kenji,Mitsuda, Akihiro,Wada, Hirofumi,Matsubayashi, Kazuyuki,et al.
, p. 1 - 3 (2011/11/30)
High field magnetization, pressure effect on electrical resistivity and dilution of Yb with Lu were examined for YbPd. The high field magnetization suggests that half of Yb ions have magnetic moments between 50 K and115 K up to 55 T. The phase transition temperatures, T1 and T2, which are observed under ambient pressure at 125 K and 10 5 K, respectively, decrease with increasing pressure and the transitionsdisappear at around 4 GPa. This indicates that the valence fluctuating state above T1 and T 2 becomes stable down to zero temperature above 4 GPa. Substitution of Lu for Yb also leads to depres sion of T1 and T2, which is possibly caused by disturbing the periodicity of Yb ions. These results suggest that the valence ordered state of Yb ions is realized in YbPd below T1 or T2.
