Abstract
Various new phenomena emerge in quantum materials under elastic deformations, such as hydrostatic or uniaxial stresses. In particular, using uniaxial strain or stress can help to tune or uncover specific structural or electronic orders in materials with multiple coexisting phases. Those phases may be associated with a quantum phase transition requiring a millikelvin environment combined with multiple experimental probes. Here, we describe our unique apparatus, which allows in situ tuning of strain in large samples inside a dilution refrigerator while the samples are monitored via an optical microscope. We describe the engineering details and show some typical results of characterizing superconducting strontium titanate under stress. This letter should serve as a practical reference for experts in ultra-low temperature experimental physics involving uniaxial stresses or strains.
Highlights
In a wide variety of quantum materials, strain plays an important role
In strontium titanate, which is a low critical temperature (Tc) superconductor, questions about our fundamental understanding of electron lattice coupling and ways to enhance Tc are at the forefront of the modern quest to understand quantum phase transitions
The strain might be key to realizing dissipationless protected states that may be useful for future quantum computing approaches
Summary
Investigation of the vortex order-disorder phase transition line in using ac techniques. Atomic layer deposition of environmentally benign SnTiOx as a potential ferroelectric material.
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