Abstract
We report the observation of a magnetic-field-assisted transient superconducting state in the two-dimensional electron gas existing at the interface of LaAlO3/SrTiO3 heterostructures. This metastable state depends critically on the density of charge carriers in the system. It appears concomitantly with a Lifshitz transition as a consequence of the interplay between ferromagnetism and superconductivity and the finite relaxation time of the in-plane magnetization. Our results clearly demonstrate the inherently metastable nature of the superconducting state competing with a magnetic order in these systems. The coexistence of superconductivity and ferromagnetism in the conducting electronic layer formed at the interface of insulating oxides has thrown up several intriguing and as yet unanswered questions. An open question in this field is the energetics of the interplay between these two competing orders and the present observation goes a long way in understanding the underlying mechanism.
| Original language | English |
|---|---|
| Article number | 174502 |
| Journal | Physical Review B |
| Volume | 95 |
| Issue number | 17 |
| DOIs | |
| State | Published - 1 May 2017 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2017 American Physical Society.
Funding
A.B. acknowledges funding from Nanomission, Department of Science and Technology (DST), Government of India, and IISc, Bangalore. A.T. and N.M. acknowledge IIT, Kharagpur, for support. A.D. and R.C.B. acknowledge funding from the IFCPAR (Project No. IFCPAR 4704-I) and also extend acknowledgment to DST for the J. C. Bose Fellowship of R.C.B. and to CSIR-India for financial support through the AQuaRIUS Project. A.B. acknowledges fruitful discussions with H. R. Krishnamurthy, Vijay Shenoy, and Manish Jain.
| Funders |
|---|
| CSIR-India |
| Indo-French Centre for the Promotion of Advanced Research |
| Department of Science and Technology, Government of Kerala |
| Indian Institute of Technology Mandi |