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24 April 2024 |
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Article overview
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The Discovery of Tunable Universality Class in Superconducting $β$-W Thin Films | | Ce Huang
; Enze Zhang
; Yong Zhang
; Jinglei Zhang
; Faxian Xiu
; Haiwen Liu
; Xiaoyi Xie
; Linfeng Ai
; Yunkun Yang
; Minhao Zhao
; Junjie Qi
; Lun Li
; Shanshan Liu
; Zihan Li
; Runze Zhan
; Ya-Qing Bie
; Xufeng Kou
; Shaozhi Deng
; X. C. Xie
; | | Date: |
24 Oct 2020 | | Abstract: | The interplay between quenched disorder and critical behavior in quantum
phase transitions is conceptually fascinating and of fundamental importance for
understanding phase transitions. However, it is still unclear whether or not
the quenched disorder influences the universality class of quantum phase
transitions. More crucially, the absence of superconducting-metal transitions
under in-plane magnetic fields in 2D superconductors imposes constraints on the
universality of quantum criticality. Here, we discover the tunable universality
class of superconductor-metal transition by changing the disorder strength in
$eta$-W films with varying thickness. The finite-size scaling uncovers the
switch of universality class: quantum Griffiths singularity to multiple quantum
criticality at a critical thickness of $t_{c perp 1}sim 8 nm$ and then from
multiple quantum criticality to single criticality at $t_{cperp 2}sim 16 nm$.
Moreover, the superconducting-metal transition is observed for the first time
under in-plane magnetic fields and the universality class is changed at $t_{c
parallel }sim 8 nm$. The discovery of tunable universality class under both
out-of-plane and in-plane magnetic fields provides broad information for the
disorder effect on superconducting-metal transitions and quantum criticality. | | Source: | arXiv, 2010.12775 | | Services: | Forum | Review | PDF | Favorites | |
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