Butch N P, Maple M B
Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093, USA.
Phys Rev Lett. 2009 Aug 14;103(7):076404. doi: 10.1103/PhysRevLett.103.076404. Epub 2009 Aug 12.
Magnetic critical scaling in URu(2-x)Re(x)Si(2) single crystals continuously evolves as the ferromagnetic critical temperature is tuned towards zero via chemical substitution. As the quantum phase transition is approached, the critical exponents gamma and (delta-1) decrease to zero in tandem with the critical temperature and ordered moment, while the exponent beta remains constant. This novel trend distinguishes URu(2-x)Re(x)Si(2) from stoichiometric quantum critical ferromagnets and appears to reflect an underlying competition between Kondo and ferromagnetic interactions.
在URu(2 - x)Re(x)Si(2)单晶中，随着通过化学取代将铁磁临界温度调至零，磁临界标度不断演变。当接近量子相变时，临界指数γ和(δ - 1)与临界温度和有序磁矩一起降至零，而指数β保持不变。这种新趋势使URu(2 - x)Re(x)Si(2)有别于化学计量的量子临界铁磁体，似乎反映了近藤相互作用和铁磁相互作用之间的潜在竞争。
