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Title: Spatially modulated susceptibility in thin film La 2 - x Ba x CuO 4

Abstract

The high critical temperature superconductor Lanthanum Barium Copper Oxide (La 2-xBa xCuO 4 or LBCO) exhibits a strong anomaly in critical temperature at 1/8th doping, nematicity, and other interesting properties. Here, we report Scanning Superconducting Quantum Interference Device (SQUID) imaging of the magnetic fields and susceptibility in a number of thin film LBCO samples with doping in the vicinity of the 1/8th anomaly. Spatially resolved measurements of the critical temperatures of these samples do not show a pronounced depression at 1/8th doping. They do, however, exhibit strong, nearly linear modulations of the susceptibility (“striae”) of multiple samples with surprisingly long periods of 1 - 4 μm. Counterintuitively, vortices trap in positions of largest diamagnetic susceptibility in these striae. Given the rich interplay of different orders in this material system and its known sensitivity to epitaxial strain, we propose phase separation as a possible origin of these features and discuss scenarios in which that might arise.

Authors:
 [1];  [2];  [3];  [4];  [3];  [3];  [5];  [6]
  1. Stanford Univ., CA (United States). Dept. of Physics
  2. Stanford Univ., CA (United States). Dept. of Physics; Univ. of California, Davis, CA (United States). Dept. of Physics
  3. Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
  4. Stanford Univ., CA (United States). Dept. of Applied Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  5. Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  6. Stanford Univ., CA (United States). Dept. of Physics, Dept. of Applied Physics and Geballe Lab. for Advanced Materials; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR)
OSTI Identifier:
1461813
Alternate Identifier(s):
OSTI ID: 1459649; OSTI ID: 1459739
Grant/Contract Number:  
AC02-76SF00515; ECCS-1542152; DMR-0957616; FA9550-09-1-0583
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 1; 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; 36 MATERIALS SCIENCE; magnetic susceptibility; Meissner effect; pairing mechanisms; superfluid density; vortices in superconductors; high-temperature superconductors; SQUID; thin films

Citation Formats

Davis, Samantha I., Ullah, Rahim R., Adamo, Carolina, Watson, Christopher A., Kirtley, John R., Beasley, Malcolm R., Kivelson, Steven A., and Moler, Kathryn A. Spatially modulated susceptibility in thin film La2-xBaxCuO4. United States: N. p., 2018. Web. doi:10.1103/physrevb.98.014506.
Davis, Samantha I., Ullah, Rahim R., Adamo, Carolina, Watson, Christopher A., Kirtley, John R., Beasley, Malcolm R., Kivelson, Steven A., & Moler, Kathryn A. Spatially modulated susceptibility in thin film La2-xBaxCuO4. United States. doi:10.1103/physrevb.98.014506.
Davis, Samantha I., Ullah, Rahim R., Adamo, Carolina, Watson, Christopher A., Kirtley, John R., Beasley, Malcolm R., Kivelson, Steven A., and Moler, Kathryn A. Wed . "Spatially modulated susceptibility in thin film La2-xBaxCuO4". United States. doi:10.1103/physrevb.98.014506. https://www.osti.gov/servlets/purl/1461813.
@article{osti_1461813,
title = {Spatially modulated susceptibility in thin film La2-xBaxCuO4},
author = {Davis, Samantha I. and Ullah, Rahim R. and Adamo, Carolina and Watson, Christopher A. and Kirtley, John R. and Beasley, Malcolm R. and Kivelson, Steven A. and Moler, Kathryn A.},
abstractNote = {The high critical temperature superconductor Lanthanum Barium Copper Oxide (La2-xBaxCuO4 or LBCO) exhibits a strong anomaly in critical temperature at 1/8th doping, nematicity, and other interesting properties. Here, we report Scanning Superconducting Quantum Interference Device (SQUID) imaging of the magnetic fields and susceptibility in a number of thin film LBCO samples with doping in the vicinity of the 1/8th anomaly. Spatially resolved measurements of the critical temperatures of these samples do not show a pronounced depression at 1/8th doping. They do, however, exhibit strong, nearly linear modulations of the susceptibility (“striae”) of multiple samples with surprisingly long periods of 1 - 4 μm. Counterintuitively, vortices trap in positions of largest diamagnetic susceptibility in these striae. Given the rich interplay of different orders in this material system and its known sensitivity to epitaxial strain, we propose phase separation as a possible origin of these features and discuss scenarios in which that might arise.},
doi = {10.1103/physrevb.98.014506},
journal = {Physical Review B},
number = 1,
volume = 98,
place = {United States},
year = {2018},
month = {7}
}

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Figures / Tables:

Figure 1 Figure 1: SQUID Susceptometer with 0.1 µm radius pickup loop10(a) Schematic layout. The current leads, modulation coil, and field coil are labeled by I, M , and F.C. respectively. All but the pickup loop/field coil regions are shielded from external magnetic fields by superconducting layers. (b) Layout of the pickupmore » loop/field coil region. (c) Layout of the entire 2 mm × 2 mm chip.« less

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