Miyazaki Y, Nakano M, Krivchikov A I, Koroyuk O A, Gebbia J F, Cazorla C, Tamarit J Ll
Research Center for Thermal and Entropic Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan.
B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences Ukraine, 47 Science Avenue, Kharkov 61103, Ukraine.
J Phys Chem Lett. 2021 Mar 4;12(8):2112-2117. doi: 10.1021/acs.jpclett.1c00289. Epub 2021 Feb 24.
We measured the specific heat of normal (CHS) and deuterated (CDS) thiophene in the temperature interval of 1 ≤ , K ≤ 25. CHS exhibits a metastable phase II and a stable phase V, both with frozen orientational disorder (OD), whereas CDS exhibits a metastable phase II, which is analogous to the OD phase II of CHS and a fully ordered stable phase V. Our measurements demonstrate the existence of a large bump in the heat capacity of both stable and metastable CDS and CHS phases at temperatures of ∼10 K, which significantly departs from the expected Debye temperature behavior of ≈ . This case study demonstrates that the identified low-temperature anomaly, typically referred to as a "Boson-peak" in the context of glassy crystals, is not exclusive of disordered materials.
我们测量了正常噻吩（CHS）和氘代噻吩（CDS）在1≤T，K≤25的温度区间内的比热容。CHS呈现出一个亚稳的II相和一个稳定的V相，两者都具有冻结的取向无序（OD），而CDS呈现出一个亚稳的II相，它类似于CHS的OD II相和一个完全有序的稳定V相。我们的测量表明，在约10 K的温度下，稳定和亚稳的CDS和CHS相的热容中都存在一个大的峰，这与预期的德拜温度行为（≈）有显著偏差。这个案例研究表明，所确定的低温异常，在玻璃态晶体的背景下通常被称为“玻色子峰”，并非无序材料所特有。
