Gapless spin excitations in superconducting La2-xCa1+xCu2O6 with Tc up to 55 K

Schneeloch, John A.; Zhong, Ruidan; Stone, M. B.; Zaliznyak, I. A.; Gu, G. D.; Xu, Guangyong; Tranquada, J. M.

doi:10.1103/PhysRevB.99.174515

Title: Gapless spin excitations in superconducting ${La}_{2 - x} {Ca}_{1 + x} {Cu}_{2} O_{6}$ with $T_{c}$ up to 55 K

Journal Article · Wed May 22 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.174515· OSTI ID:1515157

Schneeloch, John A. ^[1]; Zhong, Ruidan ^[2]; Stone, M. B. ^[3]; Zaliznyak, I. A. ^[4]; Gu, G. D. ^[4]; Xu, Guangyong ^[4]; Tranquada, J. M. ^[4]

Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Division; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Division; Stony Brook Univ., NY (United States). Materials Science and Engineering Dept.
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Division

We report here inelastic neutron scattering on single crystals of the bilayer cuprate family $${\mathrm{La}}_{2{-}x}{\mathrm{Ca}}_{1+x}{\mathrm{Cu}}_{2}{\mathrm{O}}_{6+{\delta}}$$, including two crystals made superconducting (transitions at 45 and 55 K) by high-pressure annealing in an oxygen-containing atmosphere. The magnetic excitations in the nonsuperconducting crystal have a similar temperature dependence as those in weakly hole-doped cuprates. In the superconducting crystals, there is a near-uniform suppression of the magnetic spectral weight with increasing temperature; in particular, there are no signs of a spin gap or "resonance" peak. This is different from the temperature dependence seen in many optimally doped cuprates but similar to the behavior seen in certain underdoped cuprates. We discuss the possible connection with pair-density-wave superconductivity.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; AC05-00OR22725

OSTI ID:: 1515157

Alternate ID(s):: OSTI ID: 1515109; OSTI ID: 1666020

Report Number(s):: BNL-211693-2019-JAAM

Journal Information:: Physical Review B, Vol. 99, Issue 17; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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Title: Gapless spin excitations in superconducting ${La}_{2 - x} {Ca}_{1 + x} {Cu}_{2} O_{6}$ with $T_{c}$ up to 55 K