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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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4];  [4];  [4];  [4]
  1. 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
  2. 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.
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Division
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1515157
Alternate Identifier(s):
OSTI ID: 1515109
Report Number(s):
BNL-211693-2019-JAAM
Journal ID: ISSN 2469-9950
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Schneeloch, John A., Zhong, Ruidan, Stone, M. B., Zaliznyak, I. A., Gu, G. D., Xu, Guangyong, and Tranquada, J. M. Gapless spin excitations in superconducting La2-xCa1+xCu2O6 with Tc up to 55 K. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.174515.
Schneeloch, John A., Zhong, Ruidan, Stone, M. B., Zaliznyak, I. A., Gu, G. D., Xu, Guangyong, & Tranquada, J. M. Gapless spin excitations in superconducting La2-xCa1+xCu2O6 with Tc up to 55 K. United States. doi:10.1103/PhysRevB.99.174515.
Schneeloch, John A., Zhong, Ruidan, Stone, M. B., Zaliznyak, I. A., Gu, G. D., Xu, Guangyong, and Tranquada, J. M. Wed . "Gapless spin excitations in superconducting La2-xCa1+xCu2O6 with Tc up to 55 K". United States. doi:10.1103/PhysRevB.99.174515.
@article{osti_1515157,
title = {Gapless spin excitations in superconducting La2-xCa1+xCu2O6 with Tc up to 55 K},
author = {Schneeloch, John A. and Zhong, Ruidan and Stone, M. B. and Zaliznyak, I. A. and Gu, G. D. and Xu, Guangyong and Tranquada, J. M.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.99.174515},
journal = {Physical Review B},
number = 17,
volume = 99,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
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