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首页> 外文期刊>Physical review >Evolution of the magnetic field-temperature phase diagram inUAs_(1-x)Se_x
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Evolution of the magnetic field-temperature phase diagram inUAs_(1-x)Se_x

机译：UAs_（1-x）Se_x中磁场-温度相位图的演变

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摘要

The evolution of the magnetic field-temperature phase diagram of UAs_(1-x)Se_x with x in the range of 0-0.1 is studied by means of magnetocaloric and specific-heat measurements. Our interest is focused on the high-temperature phase transitions and especially on the point, where the paramagnetic (P) and two ordered phases meet. For undoped UAs these two ordered states are the ferrimagnetic (Fi) and the type-I antiferromagnetic phases. According to Sinha et al. [Phys. Rev. Lett. 45, 1028 (1980)] the antiferromagnetic phase transition is in the vicinity of a Lifshitz point. Furthermore, Kuznietz et al. [J. Magn. Magn. Mater. 61, 246 (1986)] showed that an incommensurate phase (IC) emerges between the type-I (or type-IA) antiferromagnetic and paramagnetic phases in the case of UAs_(1-x)Se_x with 0 < x < 0.15 in zero magnetic field. The results reported in this paper show the existence of a T_(Fi/IC)(b) line that separates the ferrimagnetic region from a phase, which cannot be identified on the basis of our thermodynamic measurements. However, one may assume it is the IC phase, consistent with the above mentioned zero field results. The T_(Fi/IC)(B) line merges with the order-disorder line at point (B_p,T_p), where the critical line (IC/P) meets with two first order transitions lines: Fi/P and Fi/IC. This point can be considered as an analog of a Lifshitz point. A simple phenomenological description of the phase transitions near this special point is provided.
机译：通过磁热法和比热法研究了UAs_（1-x）Se_x的磁场-温度相位图在x为0-0.1范围内的演变。我们的兴趣集中于高温相变，尤其是顺磁性（P）和两个有序相交汇的点。对于未掺杂的UA，这两个有序状态是亚铁磁性（Fi）和I型反铁磁性相。据辛哈等。 [物理牧师45，1028（1980）]反铁磁相变在Lifshitz点附近。此外，库兹涅茨等。 [J.真是的真是的母校61，246（1986）]表明，对于UAs_（1-x）Se_x，其中0

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