In order to enable an iCal export link, your account needs to have an API key created. This key enables other applications to access data from within Indico even when you are neither using nor logged into the Indico system yourself with the link provided. Once created, you can manage your key at any time by going to 'My Profile' and looking under the tab entitled 'HTTP API'. Further information about HTTP API keys can be found in the Indico documentation.
Additionally to having an API key associated with your account, exporting private event information requires the usage of a persistent signature. This enables API URLs which do not expire after a few minutes so while the setting is active, anyone in possession of the link provided can access the information. Due to this, it is extremely important that you keep these links private and for your use only. If you think someone else may have acquired access to a link using this key in the future, you must immediately create a new key pair on the 'My Profile' page under the 'HTTP API' and update the iCalendar links afterwards.
Permanent link for public information only:
Permanent link for all public and protected information:
Structural instabilities under electron doping in SrTiO3
112:028 (Nordita South)
Perovskite oxides often exhibit structural distortions that lower the energy by optimization of the bonding compared to the perfect cubic structure. For titanates these distortions are typically the polar ferroelectric distortion as observed in BaTiO3 or octahedral rotations such as observed in CaTiO3. These two distortions are normally considered to be competing and excluding one another. SrTiO3, which chemically lies in between CaTiO3 and BaTiO3, however exhibits both instabilities at the same time. The ferroelectric instability is however so weak that it is suppressed by quantum fluctuations, making the material not a ferroelectric but instead a so-called quantum paraelectric.
Here we use density functional theory (DFT) calculations to study the interaction between the two structural instabilities in SrTiO3 and find that they also compete but that no complete suppression is observed. We then study their behavior and interaction under electron doping and find that the ferroelectric mode is strongly suppressed even by very small amounts of charge carriers, whereas that octahedral distortions are not significantly affected. The potential role of the polar instability in the superconducting mechanism will also be discussed.