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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 | | Abstract: | Quantum 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 | | Services: | Forum | Review | PDF | Favorites | |
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