UGe2的Phase diagram。是否存在量子相变？
Phase diagram of UGe2. Whether there are quantum phase transitions ?
摘要：
几种巡游铁磁体的相图揭示了它们的共同特征。相变温度随着压力的增加而降低，并且在某一临界压力$P_c$处达到零值，使得在足够低的温度下，可以预期特定于量子相变的临界行为。但事实并非如此。高压低温下的顺磁-铁磁相变为常压下的二阶相变，转变为不连续跃变。本文讨论了强各向异性铁磁体UGe_2在向铁磁态相变时一级不稳定性发展的磁弹性机制。利用表征UGe $_2$性质的参数，我们论证了这种机制将非常弱的一阶型跃迁转变为真正可观察的跃迁的有效性。
英文摘要：
The phase diagram of several itinerant ferromagnets reveals the common feature. The phase transition temperature decreases with pressure increase and reaches zero value at some critical pressure $P_c$ such that at low enough temperatures one can expect critical behavior specific for quantum phase transition. It is not the case, however. Being the second order at ambient pressure the transition from paramagnetic to ferromagnetic state at high pressures - low temperatures is transformed to the discontinuous jump. We discuss the magneto-elastic mechanism of development of the first order type instability at the phase transition to the ferromagnet state in strongly anisotropic ferromagnet UGe2. Using the parameters characterizing the properties of UGe$_2$ we argue the effectiveness of this mechanism transforming the very weak first order type transition to the really observable one.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
