Sixfold enhancement of superconductivity in a tunable electronic nematic system

Eckberg, Chris; Campbell, Daniel J.; Metz, Tristin; Collini, John; Hodovanets, Halyna; Drye, Tyler; Zavalij, Peter; Christensen, Morten H.; Fernandes, Rafael M.; Lee, Sangjun; Abbamonte, Peter; Lynn, Jeffrey W.; Paglione, Johnpierre

doi:10.1038/s41567-019-0736-9

Title: Sixfold enhancement of superconductivity in a tunable electronic nematic system

Journal Article · 22 December 2019 · Nature Physics

DOI: https://doi.org/10.1038/s41567-019-0736-9 · OSTI ID:1800351

^[1]; Campbell, Daniel J. ^[2]; Metz, Tristin ^[2]; Collini, John ^[2]; Hodovanets, Halyna ^[2]; Drye, Tyler ^[2];

^[2]; Christensen, Morten H. ^[3]; Fernandes, Rafael M. ^[3];

^[4]; Abbamonte, Peter ^[4];

^[5];

^[6]

Univ. of Maryland, College Park, MD (United States); OSTI
Univ. of Maryland, College Park, MD (United States)
Univ. of Minnesota, Minneapolis, MN (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Univ. of Maryland, College Park, MD (United States); The Canadian Institute for Advanced Research, Toronto, ON (Canada)

The electronic nematic phase—in which electronic degrees of freedom lower the crystal rotational symmetry—is commonly observed in high-temperature superconductors. However, understanding the role of nematicity and nematic fluctuations in Cooper pairing is often made more complicated by the coexistence of other orders, particularly long-range magnetic order. Here we report the enhancement of superconductivity in a model electronic nematic system that is not magnetic, and show that the enhancement is directly born out of strong nematic fluctuations associated with a quantum phase transition. We present measurements of the resistance as a function of strain in Ba_1-xSr_xNi₂As₂ to show that strontium substitution promotes an electronically driven nematic order in this system. In addition, the complete suppression of that order to absolute zero temperature leads to an enhancement of the pairing strength, as evidenced by a sixfold increase in the superconducting transition temperature. The direct relation between enhanced pairing and nematic fluctuations in this model system, as well as the interplay with a unidirectional charge-density-wave order comparable to that found in the cuprates, offers a means to investigate the role of nematicity in strengthening superconductivity.

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Research Organization:: University of Illinois at Urbana-Champaign, IL (United States); University of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-06ER46285; SC0012336

OSTI ID:: 1800351

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 3 Vol. 16; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Sixfold enhancement of superconductivity in a tunable electronic nematic system

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