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25 September 2022
 
  » arxiv » 2011.00268

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The observation of in-plane quantum Griffiths singularity in two-dimensional crystalline superconductors
Yi Liu ; Shichao Qi ; Jian Sun ; Chong Liu ; Yanzhao Liu ; Junjie Qi ; Ying Xing ; Haiwen Liu ; Xi Lin ; Lili Wang ; Qi-Kun Xue ; X. C. Xie ; Jian Wang ;
Date 31 Oct 2020
AbstractQuantum Griffiths singularity (QGS) reveals the profound influence of quenched disorder on the quantum phase transitions, characterized by the divergence of the dynamical critical exponent at the boundary of the vortex glass-like phase, named as quantum Griffiths phase. However, in the absence of vortices, whether the QGS can exist under parallel magnetic field remains a puzzle. Here we study the magnetic field induced superconductor-metal transition in ultrathin crystalline PdTe2 films grown by molecular beam epitaxy. Remarkably, the QGS emerges under both perpendicular and parallel magnetic field in 4-monolayer PdTe2 films. With increasing film thickness to 6 monolayers, the QGS disappears under perpendicular field but persists under parallel field, and this discordance may originate from the differences in microscopic processes. Our work demonstrates the universality of parallel field induced QGS and can stimulate further investigations on novel quantum phase transitions under parallel magnetic field.
Source arXiv, 2011.00268
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