Journal
PHYSICAL REVIEW MATERIALS
Volume 3, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.3.124801
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Funding
- State of Connecticut
- University of Connecticut
- Scholarship Facilitation award
- College for Liberal Arts and Sciences at the University of Connecticut
- Mark Miller award
- VILLUM FONDEN via the Centre of Excellence for Dirac Materials [11744]
- Knut and Alice Wallenberg Foundation [2013.0096]
- U.S. BES E3B7
- Physics Department
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The pairing mechanism of unconventional superconductivity in strontium titanate is hotly debated. Here, using a multisensor experimental apparatus with a mechanical strain cell, an optical microscope, and with transport and magnetic probes all contained in a closed-cycle dilution refrigerator, we determined that the superconducting transition temperature of strontium titanate increases dramatically even for very small strains induced by application of uniaxial tension. These results imply that superconductivity is controlled by very small atomic shifts; the only strain-sensitive pairing channel candidate is the one linked to quantum ferroelectric (polar) instability. This investigation, therefore, uncovers additional constraints on the debated theories of superconductivity in this low carrier concentration material near the ferroelectric quantum phase transition.
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