2014
DOI: 10.1038/srep06040
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High temperature superconducting FeSe films on SrTiO3 substrates

Abstract: Interface enhanced superconductivity at two dimensional limit has become one of most intriguing research directions in condensed matter physics. Here, we report the superconducting properties of ultra-thin FeSe films with the thickness of one unit cell (1-UC) grown on conductive and insulating SrTiO3 (STO) substrates. For the 1-UC FeSe on conductive STO substrate (Nb-STO), the magnetization versus temperature (M-T) measurement shows a drop crossover around 85 K. For the FeSe films on insulating STO substrate, … Show more

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Cited by 120 publications
(115 citation statements)
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“…Indeed, the fact that the Fermi surface of these materials is composed of small hole pockets and electron pockets separated by the magnetic ordering vector led to the proposal of a sign-changing s +− wave state, in which the gap function has different signs in the hole and in the electron pockets. However, the recent observation of superconductivity over 70 K in monolayer FeSe brought new challenges to the field [5][6][7][8][9][10][11][12][13][14]. In contrast to the standard FeSC, no long-range magnetic order is observed in thin films or even bulk FeSe [15], and the Fermi surface of monolayer FeSe consists of electron pockets only [6,7,11,16].…”
mentioning
confidence: 99%
“…Indeed, the fact that the Fermi surface of these materials is composed of small hole pockets and electron pockets separated by the magnetic ordering vector led to the proposal of a sign-changing s +− wave state, in which the gap function has different signs in the hole and in the electron pockets. However, the recent observation of superconductivity over 70 K in monolayer FeSe brought new challenges to the field [5][6][7][8][9][10][11][12][13][14]. In contrast to the standard FeSC, no long-range magnetic order is observed in thin films or even bulk FeSe [15], and the Fermi surface of monolayer FeSe consists of electron pockets only [6,7,11,16].…”
mentioning
confidence: 99%
“…Our result of U 0 for FTS0.50 is close to the reported values of Onar et al for bulk FeTe 0.50 Se 0.50 but it is somewhat smaller than the epitaxial thin film of FeTe 0.60 Se 0.40 and 2 unit cell FeSe film. [39][40][41] Furthermore, the activation energy shows a magnetic field dependent power law relation U 0 (H)∝H -α in the magnetic field range 4-8 T. In the present work the estimated values of α are ∼ 0.35, 0.67, 0.68, 0.68 for the samples FTS0.25, FTS0.35, FTS0.40, FTS0.50 (H≥4 T), respectively. The observed values of α suggest the presence of planer pinning defect in FTS0.25, whereas mixed pinning defect centers, i.e.…”
Section: Resultsmentioning
confidence: 51%
“…34,42 Similar behavior has been observed for FeSe thin film. 41 To study the superconducting transition and any other magnetic transitions in the grown samples the temperature dependent dc magnetization measurements have been performed for both ZFC and FC cycles at 100 Oe applied magnetic field. The figure 3 shows the representative ZFC and FC plots of sample FTS0.50.…”
Section: Resultsmentioning
confidence: 99%
“…Although experimentally observed K contents in SC phases by far are discrete, recent reports about carrier concentration tuning of T c from 30 to above 40 K in FeSe thin flakes47, 48 implies that their variation of T c with carrier concentration can be continuous, similar to the cases in other high‐temperature superconductors. Further improvement of T c can be expected considering the experimental progresses achieved in single‐layer FeSe films 49, 50, 51, 52, 53, 54. Therefore, we infer that the 30 K phase is electron overdoped and the 44 K phase also might not be optimally tuned.…”
mentioning
confidence: 87%