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Title: Superconductivity-insensitive order at q~1/4 in electron doped cuprates

Abstract

One of the central questions in the cuprate research is the nature of the ‘normal state’ which develops into high temperature superconductivity (HTSC). In the normal state of hole-doped cuprates, the existence of charge density wave (CDW) is expected to shed light on the mechanism of HTSC. With evidence emerging for CDW order in the electron-doped cuprates, the CDW would be thought to be a universal phenomenon in high-T c cuprates. However, the CDW phenomena in electron-doped cuprate are quite different than those in hole-doped cuprates. Here we study the nature of the putative CDW in an electron-doped cuprate through direct comparisons between as-grown and post-annealed Nd 1.86Ce 0.14CuO 4 (NCCO) single crystals using Cu L 3-edge resonant soft x-ray scattering (RSXS) and angleresolved photoemission spectroscopy (ARPES). The RSXS result reveals that the non-superconducting NCCO shows the same reflections at the wavevector (~1/4, 0, l) as like the reported superconducting NCCO. This superconductivity-insensitivesignal is quite different with the characteristics of the CDW reflection in hole-doped cuprates. Moreover, the ARPES result suggests that the fermiology cannot account for such wavevector. Furthermore, these results call into question the universality of CDW phenomenon in the cuprates.

Authors:
 [1];  [1];  [2];  [2];  [1];  [1];  [3];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Tohoku Univ., Sendai (Japan)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Western Michigan Univ., Kalamazoo MI (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1413817
Grant/Contract Number:
AC02-76SF00515; FG02-99ER45772
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 7; Journal Issue: 4; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Lee, Jun -Sik, Jang, H., Asano, S., Fujita, M., Hashimoto, M., Lu, D. H., Burns, C. A., and Kao, C. -C. Superconductivity-insensitive order at q~1/4 in electron doped cuprates. United States: N. p., 2017. Web. doi:10.1103/PhysRevX.7.041066.
Lee, Jun -Sik, Jang, H., Asano, S., Fujita, M., Hashimoto, M., Lu, D. H., Burns, C. A., & Kao, C. -C. Superconductivity-insensitive order at q~1/4 in electron doped cuprates. United States. doi:10.1103/PhysRevX.7.041066.
Lee, Jun -Sik, Jang, H., Asano, S., Fujita, M., Hashimoto, M., Lu, D. H., Burns, C. A., and Kao, C. -C. 2017. "Superconductivity-insensitive order at q~1/4 in electron doped cuprates". United States. doi:10.1103/PhysRevX.7.041066.
@article{osti_1413817,
title = {Superconductivity-insensitive order at q~1/4 in electron doped cuprates},
author = {Lee, Jun -Sik and Jang, H. and Asano, S. and Fujita, M. and Hashimoto, M. and Lu, D. H. and Burns, C. A. and Kao, C. -C.},
abstractNote = {One of the central questions in the cuprate research is the nature of the ‘normal state’ which develops into high temperature superconductivity (HTSC). In the normal state of hole-doped cuprates, the existence of charge density wave (CDW) is expected to shed light on the mechanism of HTSC. With evidence emerging for CDW order in the electron-doped cuprates, the CDW would be thought to be a universal phenomenon in high-Tc cuprates. However, the CDW phenomena in electron-doped cuprate are quite different than those in hole-doped cuprates. Here we study the nature of the putative CDW in an electron-doped cuprate through direct comparisons between as-grown and post-annealed Nd1.86Ce0.14CuO4 (NCCO) single crystals using Cu L3-edge resonant soft x-ray scattering (RSXS) and angleresolved photoemission spectroscopy (ARPES). The RSXS result reveals that the non-superconducting NCCO shows the same reflections at the wavevector (~1/4, 0, l) as like the reported superconducting NCCO. This superconductivity-insensitivesignal is quite different with the characteristics of the CDW reflection in hole-doped cuprates. Moreover, the ARPES result suggests that the fermiology cannot account for such wavevector. Furthermore, these results call into question the universality of CDW phenomenon in the cuprates.},
doi = {10.1103/PhysRevX.7.041066},
journal = {Physical Review. X},
number = 4,
volume = 7,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevX.7.041066

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  • One of the central questions in the cuprate research is the nature of the ‘normal state’ which develops into high temperature superconductivity (HTSC). In the normal state of hole-doped cuprates, the existence of charge density wave (CDW) is expected to shed light on the mechanism of HTSC. With evidence emerging for CDW order in the electron-doped cuprates, the CDW would be thought to be a universal phenomenon in high-T c cuprates. However, the CDW phenomena in electron-doped cuprate are quite different than those in hole-doped cuprates. Here we study the nature of the putative CDW in an electron-doped cuprate throughmore » direct comparisons between as-grown and post-annealed Nd 1.86Ce 0.14CuO 4 (NCCO) single crystals using Cu L 3-edge resonant soft x-ray scattering (RSXS) and angleresolved photoemission spectroscopy (ARPES). The RSXS result reveals that the non-superconducting NCCO shows the same reflections at the wavevector (~1/4, 0, l) as like the reported superconducting NCCO. This superconductivity-insensitivesignal is quite different with the characteristics of the CDW reflection in hole-doped cuprates. Moreover, the ARPES result suggests that the fermiology cannot account for such wavevector. Furthermore, these results call into question the universality of CDW phenomenon in the cuprates.« less
  • We have attempted electron and hole doping in Nd-based cuprates with single-layer sheets of Cu-O squares and pyramids. It was found that partial substitution of Nd/sup 3+/ sites with Ce/sup 4+/ ions introduces mobile electrons into the Nd/sub 2/CuO/sub 4/ structure which shows two-dimensional (2D) sheets of Cu-O squares with no apical oxygens. With further Sr doping into Nd/sub 2-//sub x/Ce/sub x/CuO/sub 4/, the crystalline lattice undergoes a structural transformation into the new hole-conductive compound with 2D sheets of Cu-O pyramids, which is identical with the superconducting phase discovered recently by Akimitsu et al. The hole concentration in Nd/sub 2-//submore » x//sub -//sub y/ Ce/sub x/Sr/sub y/CuO/sub 4-//sub delta/ can be increased by controlling the composition (x,y) of non-copper cations and filling oxygen vacancies (delta) as well, which give rise to superconductivity with T/sub c/ up to 30 K.« less
  • No abstract prepared.
  • High-pressure neutron powder diffraction, muon-spin rotation, and magnetization studies of the structural, magnetic, and the superconducting properties of the Ce-underdoped superconducting (SC) electron-doped cuprate system with the Nd 2 CuO 4 (the so-called T ' ) structure T ' - Pr 1.3 - x La 0.7 Ce x CuO 4 with x = 0.1 are reported. A strong reduction of the in-plane and out-of-plane lattice constants is observed under pressure. However, no indication of any pressure-induced phase transition from T ' to the K 2 NiF 4 (the so-called T) structure is observed up to the maximum applied pressure ofmore » p = 11 GPa. Large and nonlinear increase of the short-range magnetic order temperature T so in T ' - Pr 1.3 - x La 0.7 Ce x CuO 4 ( x = 0.1 ) was observed under pressure. Simultaneous pressure causes a nonlinear decrease of the SC transition temperature T c . All these experiments establish the short-range magnetic order as an intrinsic and competing phase in SC T ' - Pr 1.3 - x La 0.7 Ce x CuO 4 ( x = 0.1 ). The observed pressure effects may be interpreted in terms of the improved nesting conditions through the reduction of the in-plane and out-of-plane lattice constants upon hydrostatic pressure.« less