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Anomalous magnetoresistance in the spinel superconductor LiTi2O4

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journal contribution
posted on 10.08.2015, 08:58 by K. Jin, G. He, X. Zhang, S. Maruyama, S. Yasui, R. Suchoski, J. Shin, Y. Jiang, H.S. Yu, J. Yuan, L. Shan, Feodor Kusmartsev, R.L. Greene, I. Takeuchi
LiTi2O4 is a unique compound in that it is the only known spinel oxide superconductor. The lack of high quality single crystals has thus far prevented systematic investigations of its transport properties. Here we report a careful study of transport and tunnelling spectroscopy in epitaxial LiTi2O4 thin films. An unusual magnetoresistance is observed which changes from nearly isotropic negative to prominently anisotropic positive as the temperature is decreased. We present evidence that shows that the negative magnetoresistance likely stems from the suppression of local spin fluctuations or spin-orbit scattering centres. The positive magnetoresistance suggests the presence of an orbital-related state, also supported by the fact that the superconducting energy gap decreases as a quadratic function of magnetic field. These observations indicate that the spin-orbital fluctuations play an important role in LiTi2O4 in a manner similar to high-temperature superconductors.

Funding

This research was supported by the National Science Foundation (DMR-1104256 and 1410665), AFOSR-MURI (FA9550-09-1-0603), AFOSR (FA95501410332), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB07020100) and the National Natural Science Foundation of China Grant (11474338, 11322432).

History

School

  • Science

Department

  • Physics

Published in

Nature Communications

Volume

6

Citation

JIN, K. ...et al., 2015. Anomalous magnetoresistance in the spinel superconductor LiTi2O4. Nature Communications, 6. article no. 7183.

Publisher

© Macmillan Publishers Limited.

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

10/04/2015

Publication date

2015-05-20

Notes

This is the accepted manuscript version of the paper. The definitive published version can be found at: http://dx.doi.org/10.1038/ncomms8183

ISSN

2041-1723

eISSN

2041-1723

Language

en

Article number

7183

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