A phase transition driven by subtle distortion without broken symmetry on spin, charge and lattice in Layered LnCu4-{\delta}P2(Ln=Eu, Sr)

In the scenario of Landau phase transition theory in condensed matter physics, any thermal dynamic phase transition must be subject to some kind of broken symmetries, that are relative to its spin, charge, orbital and lattice. Here we report a rare phase transition at Tp ~120 K or 140 K in layered m...

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Bibliographic Details
Published inarXiv.org
Main Authors Nie, Yong, Chen, Zheng, Wensen Wei, Li, Huijie, Zhang, Yong, Mei, Ming, Song, Wenhai, Song, Dongsheng, Wei, Ning, Wang, Zhaosheng, Zhu, Xiangde, Tian, Mingliang
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 15.07.2022
Subjects
Broken symmetry
Condensed matter physics
Distortion
Lattice parameters
Layered materials
Phase transitions
Thermal expansion
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Summary:In the scenario of Landau phase transition theory in condensed matter physics, any thermal dynamic phase transition must be subject to some kind of broken symmetries, that are relative to its spin, charge, orbital and lattice. Here we report a rare phase transition at Tp ~120 K or 140 K in layered materials LnCu4-{\delta}P2 (Ln=Eu, Sr) driven by a subtle structural-distortion without any broken symmetry on charge, spin and lattice. The variations of the lattice parameters, ({\Delta}Lc/Lc) ~ 0.013% or 0.062%, verified by thermal expansion, is much less than that for a typical crystalline phase transition (~0.5-1%), but the significant anomaly in heat capacity provides clear evidence of its intrinsic nature of thermodynamic transition.
ISSN:2331-8422