Effect of spin-orbit interaction on the vortex dynamics in LaAlO3/SrTiO3 interfaces near the superconducting transition

Gopi Nath Daptary, Hemanta Kumar Kundu, Pramod Kumar, Anjana Dogra, Narayan Mohanta, A. Taraphder, Aveek Bid

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Controlling spin-orbit interaction and its effect on superconductivity has been a long-standing problem in two-dimensional inversion-symmetry-broken superconductors. An open challenge is to understand the role of various energy scales in shaping the complex phase diagram in these systems. From a combined experimental and theoretical study of resistance fluctuations and its higher-order statistics, we propose a phase diagram for the superconducting phase in the magnetic-field-spin-orbit interaction energy plane for the quasi-two-dimensional electron gas at the interface of LaAlO3/SrTiO3 heterostructures. The relative variance of resistance fluctuations increases by few orders of magnitude below the spin-orbit field BSO and a non-Gaussian component to the fluctuations arises for fields below the upper critical field Bc2. Theoretical calculations show that the non-Gaussian noise predominantly arises due to percolative nature of the superconducting transition. We quantify the strength and the relative importance of the spin-orbit interaction energy, Zeeman energy, and the pairing potential. Our work highlights the important role played by the interplay between these energy scales in framing the fascinating phases seen in two-dimensional inversion-symmetry-broken superconductors.

Original languageEnglish
Article number125117
JournalPhysical Review B
Issue number12
StatePublished - 9 Sep 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 American Physical Society.


The authors thank R. C. Budhani and IIT Kanpur for providing the samples. A.B. acknowledges funding from SERB, DST, Government of India. H.K.K. acknowledges funding from CSIR, Government of India.

FundersFunder number
Department of Science and Technology, Ministry of Science and Technology, India
Council of Scientific and Industrial Research, India
Science and Engineering Research Board


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