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This content will become publicly available on May 9, 2019

Title: Modification of structural disorder by hydrostatic pressure in the superconducting cuprate YBa 2 Cu 3 O 6.73

Here, compelling efforts to improve the critical temperature (T c) of superconductors have been made through high-pressure application. Understanding the underlying mechanism behind such improvements is critically important; however, much remains unclear. Here we studied ortho-III YBa 2Cu 3O 6.73 (YBCO) using x-ray scattering under hydrostatic pressure (HP) up to ~6.0GPa. We found the reinforced oxygen order of YBCO under HP, revealing an oxygen rearrangement in the Cu-O layer, which evidently shows the charge-transfer phenomenon between the CuO 2 plane and Cu-O layer. Concurrently, we also observed no disorder-pinned charge-density-wave signature in CuO 2 plane under HP. This indicates that the oxygen rearrangement modifies the quenched disorder state in the CuO 2 plane. Using these results, we appropriately explain why pressure condition can achieve higher T c compared with the optimal T c under ambient pressure in YBa 2Cu 3O 6+x. As an implication of these results, finally we have discussed that the change in disorder could make it easier for YBa 2Cu 3O 6+x to undergo a transition to the nematic order under an external magnetic field.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [7] ;  [7] ;  [7] ;  [8] ;  [5] ;  [5] ;  [5]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Chinese Academy of Sciences, Shanghai (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Pohang Accelerator Lab., Gyeongbuk (Republic of Korea)
  3. Tohoku Univ., Sendai (Japan)
  4. Kyushu Sangyo Univ., Fukuoka (Japan)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Chinese Academy of Sciences, Shanghai (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  7. Carnegie Inst. of Washington, Argonne, IL (United States)
  8. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515; FG02-99ER45775; NA0001974; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1436751
Alternate Identifier(s):
OSTI ID: 1436539