Orendáč Matúš, Gabáni Slavomír, Farkašovský Pavol, Gažo Emil, Kačmarčík Jozef, Marcin Miroslav, Pristáš Gabriel, Siemensmeyer Konrad, Shitsevalova Natalya, Flachbart Karol
Institute of Experimental Physics, SAS, Watsonova Str. 47, 04001, Košice, Slovakia.
Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, 14109, Berlin, Germany.
Sci Rep. 2021 Mar 25;11(1):6835. doi: 10.1038/s41598-021-86353-5.
We present a study of the ground state and stability of the fractional plateau phase (FPP) with M/M = 1/8 in the metallic Shastry-Sutherland system TmB. Magnetization (M) measurements show that the FPP states are thermodynamically stable when the sample is cooled in constant magnetic field from the paramagnetic phase to the ordered one at 2 K. On the other hand, after zero-field cooling and subsequent magnetization these states appear to be of dynamic origin. In this case the FPP states are closely associated with the half plateau phase (HPP, M/M = ½), mediate the HPP to the low-field antiferromagnetic (AF) phase and depend on the thermodynamic history. Thus, in the same place of the phase diagram both, the stable and the metastable (dynamic) fractional plateau (FP) states, can be observed, depending on the way they are reached. In case of metastable FP states thermodynamic paths are identified that lead to very flat fractional plateaus in the FPP. Moreover, with a further decrease of magnetic field also the low-field AF phase becomes influenced and exhibits a plateau of the order of 1/1000 M.
我们展示了对金属性沙斯特里 - 萨瑟兰体系TmB中M/M = 1/8的分数平台相（FPP）的基态和稳定性的研究。磁化强度（M）测量表明，当样品在恒定磁场中从顺磁相冷却至2K的有序相时，FPP态在热力学上是稳定的。另一方面，在零场冷却及随后的磁化之后，这些态似乎源于动力学过程。在这种情况下，FPP态与半平台相（HPP，M/M = ½）紧密相关，将HPP介导至低场反铁磁（AF）相，并且依赖于热力学历史。因此，在相图的同一位置，根据达到的方式，可以观察到稳定的和亚稳的（动力学的）分数平台（FP）态。对于亚稳的FP态，确定了导致FPP中非常平坦的分数平台的热力学路径。此外，随着磁场的进一步降低，低场AF相也受到影响，并表现出约为1/1000 M的平台。
