Peculiarities of energy level crossing effects in a singlet paramagnet PrVO4
详细信息 查看全文
- 作者：Kazei ; Z.A. ; Kirste ; A. ; Kolmakova ; N.P. ; von Ortenberg ; M. ; Platonov ; V.V. ; Puhlmann ; N. ; Sidorenko ; A.A. ; et. al.
- 关键词：71.70.&minus ; d ; 75.30.Cr ; 75.30.Sg ; Electronic energy level crossings ; Magnetocaloric effect ; Van Vleck paramagnets ; Enhanced nuclear magnets
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2001
- 出版时间：February, 2001
- 年：2001
- 卷：224
- 期：1
- 页码：76-84
- 全文大小：240 K
文摘
Magnetic anomalies caused by an energy level interaction in a high magnetic field are investigated experimentally and theoretically for a Van Vleck paramagnet PrVO4. Maxima of the differential susceptibility dM/dH associated with a crossing of the lowest-lying levels at the field HC
yphs/BQ4.GIF>51.3T are observed for various temperatures. The hysteresis is detected, which is ascribed to the relaxation processes. The magnetocaloric effect calculated on the assumption of adiabatic magnetization at pulsed fields shows the monotonous decrease of the temperature with increasing field up to HC and its subsequent increase. The problem of spin-lattice relaxation times in the vicinity of crossover is discussed. The great importance of the hyperfine coupling in the crossover effects for the PrVO4, which is among the enhanced nuclear magnets, is emphasized.
yphs/BQ4.GIF>51.3T are observed for various temperatures. The hysteresis is detected, which is ascribed to the relaxation processes. The magnetocaloric effect calculated on the assumption of adiabatic magnetization at pulsed fields shows the monotonous decrease of the temperature with increasing field up to HC and its subsequent increase. The problem of spin-lattice relaxation times in the vicinity of crossover is discussed. The great importance of the hyperfine coupling in the crossover effects for the PrVO4, which is among the enhanced nuclear magnets, is emphasized.