Silhanek A V, Jaime M, Harrison N, Fanelli V R, Batista C D, Amitsuka H, Nakatsuji S, Balicas L, Kim K H, Fisk Z, Sarrao J L, Civale L, Mydosh J A
National High Magnetic Field Laboratory, Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA.
Phys Rev Lett. 2006 Apr 7;96(13):136403. doi: 10.1103/PhysRevLett.96.136403. Epub 2006 Apr 5.
We report measurements and analysis of the specific heat and magnetocaloric effect-induced temperature changes at the phase boundary into the single magnetic field-induced phase (phase II) of U(Ru0.96Rh0.04)2Si2, which yield irreversible properties similar to those at the valence transition of Yb(1-x)Y(x)InCu4. To explain these similarities, we propose a bootstrap mechanism by which lattice parameter changes caused by an electric quadrupolar order parameter within phase II become coupled to the 5f-electron hybridization, giving rise to a valence change at the transition.
我们报告了对U(Ru0.96Rh0.04)2Si2进入单磁场诱导相（相II）的相界处的比热和磁热效应引起的温度变化的测量和分析，其产生了与Yb(1-x)Y(x)InCu4价态转变时相似的不可逆特性。为了解释这些相似性，我们提出了一种自举机制，通过该机制，相II内由电四极序参量引起的晶格参数变化与5f电子杂化耦合，从而在转变时引起价态变化。
