Resistivity vs Temperature (IMAGE) Tokyo Institute of Technology Caption The results show that resistivity begins to decrease sharply at temperatures below 40 K regardless of the thickness of the FeSe layer. This means that two-dimensional superconductivity in FeSe/STO occurs at the interface rather than across all FeSe layers. ρ2D: two-dimensional resistivity, UC: unit-cell thickness. Credit Physical Review Letters Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.