Effectively tuning the quantum Griffiths phase by controllable quantum fluctuations.

ABSTRACT: Quantum Griffiths phase (QGP), marked by a quantum Griffiths singularity with a divergent effective critical exponent, has garnered considerable attention in the realm of superconductivity. However, the ability to control QGP remains elusive. Here, we demonstrate that QGP at the LaAlO₃/KTaO₃(110) interface can be efficiently modulated by the orientation of applied magnetic field: With a perpendicular field, an anomalous QGP emerges in the low-temperature regime, characterized by a decreasing critical field as temperature lowers; conversely, with a parallel field, a normal QGP arises, where the critical field increases with decreasing temperature. Such opposite characteristics stem from the controllable quantum fluctuations and conductivity corrections under distinct m

SUBMITTER: Wang B 

PROVIDER: S-EPMC11601250 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature