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Title: Homogeneous superconducting gap in Dy Ba 2 Cu 3 O 7 - δ synthesized by oxide molecular beam epitaxy

Abstract

Much of what is known about high-temperature cuprate superconductors stems from studies based on two surface analytical tools, angle-resolved photoemission spectroscopy (ARPES) and spectroscopic imaging scanning tunneling microscopy (SI-STM). A question of general interest is whether and when the surface properties probed by ARPES and SI-STM are representative of the intrinsic properties of bulk materials. We find this question is prominent in thin films of a rarely studied cuprate Dy Ba 2 Cu 3 O 7 - δ DBCO). We synthesize DBCO films by oxide molecular beam epitaxy and study them by in situ ARPES and SI-STM. Both ARPES and SI-STM show that the surface DBCO layer is different from the bulk of the film—it is heavily underdoped, while the doping level in the bulk is close to optimal doping evidenced by bulk-sensitive mutual inductance measurements. ARPES shows the typical electronic structure of a heavily underdoped CU O2 plane and two sets of one-dimensional bands originating from the CuO chains with one of them gapped. SI-STM reveals two different energy scales in the local density of states, with one (at ~ 18 meV ) corresponding to the superconductivity and the other one (at ~ 90 meV ) to the pseudogap. Finally, while the pseudogap shows large variations over the length scale of a few nanometers, the superconducting gap is very homogeneous. This indicates that the pseudogap and superconductivity are of different origins.

Authors:
ORCiD logo [1];  [2];  [1];  [3]; ORCiD logo [1];  [1];  [4];  [4];  [1];  [2];  [2];  [1]; ORCiD logo [1]; ORCiD logo [5]; ORCiD logo [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Max Planck Inst. for Solid State Research, Stuttgart (Germany)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
  4. Seoul National Univ. (Korea, Republic of)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG); European Union (EU); Institute for Basic Science in Korea; Seoul National University; National Research Foundation of Korea (NRF)
OSTI Identifier:
1762756
Report Number(s):
BNL-220903-2021-JAAM
Journal ID: ISSN 2475-9953
Grant/Contract Number:  
SC0012704; AC02-98CH10886; 823717ESTEEM3; IBS-R009-G2
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 12; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Wu, Ze-Bin, Putzky, Daniel, Kundu, Asish K., Li, Hui, Yang, Shize, Du, Zengyi, Joo, Sang Hyun, Lee, Jinho, Zhu, Yimei, Logvenov, Gennady, Keimer, Bernhard, Fujita, Kazuhiro, Valla, Tonica, Božović, Ivan, and Drozdov, Ilya K. Homogeneous superconducting gap in Dy Ba 2 Cu 3 O 7 - δ synthesized by oxide molecular beam epitaxy. United States: N. p., 2020. Web. doi:10.1103/physrevmaterials.4.124801.
Wu, Ze-Bin, Putzky, Daniel, Kundu, Asish K., Li, Hui, Yang, Shize, Du, Zengyi, Joo, Sang Hyun, Lee, Jinho, Zhu, Yimei, Logvenov, Gennady, Keimer, Bernhard, Fujita, Kazuhiro, Valla, Tonica, Božović, Ivan, & Drozdov, Ilya K. Homogeneous superconducting gap in Dy Ba 2 Cu 3 O 7 - δ synthesized by oxide molecular beam epitaxy. United States. https://doi.org/10.1103/physrevmaterials.4.124801
Wu, Ze-Bin, Putzky, Daniel, Kundu, Asish K., Li, Hui, Yang, Shize, Du, Zengyi, Joo, Sang Hyun, Lee, Jinho, Zhu, Yimei, Logvenov, Gennady, Keimer, Bernhard, Fujita, Kazuhiro, Valla, Tonica, Božović, Ivan, and Drozdov, Ilya K. Thu . "Homogeneous superconducting gap in Dy Ba 2 Cu 3 O 7 - δ synthesized by oxide molecular beam epitaxy". United States. https://doi.org/10.1103/physrevmaterials.4.124801. https://www.osti.gov/servlets/purl/1762756.
@article{osti_1762756,
title = {Homogeneous superconducting gap in Dy Ba 2 Cu 3 O 7 - δ synthesized by oxide molecular beam epitaxy},
author = {Wu, Ze-Bin and Putzky, Daniel and Kundu, Asish K. and Li, Hui and Yang, Shize and Du, Zengyi and Joo, Sang Hyun and Lee, Jinho and Zhu, Yimei and Logvenov, Gennady and Keimer, Bernhard and Fujita, Kazuhiro and Valla, Tonica and Božović, Ivan and Drozdov, Ilya K.},
abstractNote = {Much of what is known about high-temperature cuprate superconductors stems from studies based on two surface analytical tools, angle-resolved photoemission spectroscopy (ARPES) and spectroscopic imaging scanning tunneling microscopy (SI-STM). A question of general interest is whether and when the surface properties probed by ARPES and SI-STM are representative of the intrinsic properties of bulk materials. We find this question is prominent in thin films of a rarely studied cuprate Dy Ba 2 Cu 3 O 7 - δ DBCO). We synthesize DBCO films by oxide molecular beam epitaxy and study them by in situ ARPES and SI-STM. Both ARPES and SI-STM show that the surface DBCO layer is different from the bulk of the film—it is heavily underdoped, while the doping level in the bulk is close to optimal doping evidenced by bulk-sensitive mutual inductance measurements. ARPES shows the typical electronic structure of a heavily underdoped CU O2 plane and two sets of one-dimensional bands originating from the CuO chains with one of them gapped. SI-STM reveals two different energy scales in the local density of states, with one (at ~ 18 meV ) corresponding to the superconductivity and the other one (at ~ 90 meV ) to the pseudogap. Finally, while the pseudogap shows large variations over the length scale of a few nanometers, the superconducting gap is very homogeneous. This indicates that the pseudogap and superconductivity are of different origins.},
doi = {10.1103/physrevmaterials.4.124801},
journal = {Physical Review Materials},
number = 12,
volume = 4,
place = {United States},
year = {2020},
month = {12}
}

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