Magnetic and Magnetoresistive Behavior of the Ferromagnetic Heavy Fermion YbNi2
Por:
Olicon, O., Escamilla, R., Conde-Gallardo, A., Morales, F.
Publicada:
1 abr 2019
Resumen:
We present a study on the magnetic susceptibility (T) and electrical
resistance, as a function of temperature and magnetic field R(T, H), of
the ferromagnetic heavy fermion YbNi2. The X-ray diffraction analysis
shows that the synthesized polycrystalline samples crystallizes in the
cubic Laves phase structure C15, with a spatial group Fd3m. The magnetic
measurements indicate a ferromagnetic behavior with transition
temperature at 9 K. The electrical resistance is metallic-like at high
temperatures and no signature of Kondo effect was observed. In the
ferromagnetic state, the electrical resistance can be justified by
electron-magnon scattering considering the existence of an energy gap in
the magnonic spectrum. The energy gap was determined for various applied
magnetic fields. Magnetoresistance as a function of applied magnetic
field, subtracted from the R(T, H) curves at several temperatures, is
negative from 2 K until about 40 K for all applied magnetic fields. The
negative magnetoresistance originates from the suppression of magnetic
disorder by the magnetic field.
Filiaciones:
Olicon, O.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Escamilla, R.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Conde-Gallardo, A.:
Inst Politecn Nacl, Dept Fis, Ctr Invest & Estudios Avanzados, AP 14740, Mexico City 07300, DF, Mexico
Morales, F.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
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