Unveiling the phase diagram of a striped cuprate at high magnetic fields: hidden order of Cooper pairs

Shi, Z., Baity, P.G. , Sasagawa, T. and Popović, D. (2018) Unveiling the phase diagram of a striped cuprate at high magnetic fields: hidden order of Cooper pairs. arXiv, (Submitted)

188705.pdf - Submitted Version


Publisher's URL: https://arxiv.org/abs/1801.06903


The interplay of charge orders with superconductivity in underdoped cuprates at high magnetic fields (H) is an open question, and even the value of the upper critical field (Hc2), a measure of the strength of superconductivity, has been the subject of a long-term debate. We combined three complementary transport techniques on underdoped La1.8−xEu0.2SrxCuO4 with a "striped" charge order and a low H=0 transition temperature T0c, to establish the T−H phase diagram and reveal the ground states in CuO2 planes: a superconductor, a wide regime of superconducting phase fluctuations (i.e. a vortex liquid), and a high-field normal state. The relatively high Hc2 is consistent with the opening of a superconducting gap above T0c, but only at T∼(2-3)T0c, an order of magnitude below the pseudogap temperature. Within the vortex liquid, an unanticipated, insulatinglike region, but with strong superconducting correlations, begins to emerge already at T≲T0c. The results suggest that the presence of stripes plays a crucial role in the freezing of Cooper pairs in this novel state. Our findings provide a fresh perspective on the pairing strength in underdoped cuprates, and introduce a new avenue for exploring the interplay of various orders.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Baity, Dr Paul
Authors: Shi, Z., Baity, P.G., Sasagawa, T., and Popović, D.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:arXiv
Copyright Holders:Copyright © 2018 The Authors
Publisher Policy:Reproduced with the permission of the Author

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