Magnetic phase transition in YCo3B2 studied by magnetic resonance.

Authors :: Sigalov, O.
Shames, A. I.
Caspi, E. N.
Dubman, M.
Ettedgui, H.
Goren, S. D.
Shaked, H.
Source :: Journal of Applied Physics; 10/1/2005, Vol. 98 Issue 7, p074105, 4p, 10 Graphs
Publication Year :: 2005
Abstract: Magnetic-susceptibility measurements, nuclear magnetic resonance (NMR) of <superscript>11</superscript>B, and electron magnetic-resonance (EMR) spectra of YCo<subscript>3</subscript>B<subscript>2</subscript> were measured as a function of the temperature. The temperature dependence of the magnetic susceptibility showed a lambda-shaped anomaly at 150 K. Whereas upon cooling, a shift in the resonance position of the NMR and EMR spectra is observed at 150 K, marking the emergence of an internal magnetic field. The quadrupolar splitting of the NMR lines showed a marked discontinuity at 150 K. The (T<subscript>1</subscript>T)<superscript>-1/2</superscript> values were found to be independent of temperature for T>175 K, and to increase sharply upon cooling for T<150 K. The intensity of the EMR line which is independent of temperature for T>160 K is also found to increase markly upon cooling below 150 K. All these effects are discussed and it is proposed that YCo<subscript>3</subscript>B<subscript>2</subscript> undergoes a magnetic ordering phase transition at 150 K. [ABSTRACT FROM AUTHOR]