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Probing the Meissner effect in single crystals of $\mathbf{Bi_2Sr_2Ca_2Cu_3O_{10+δ}}$ via wide-field quantum microscopy under high pressure

Masahiro Ohkuma, Ryo Matsumoto, Shintaro Adachi, Shinobu Onoda, Takao Watanabe, Kenji Ohta, Yoshihiko Takano, Keigo Arai

Abstract

We investigated the pressure dependence of the superconducting transition temperature ($T_{\rm c}$) in optimally doped Bi$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10+δ}$ (Bi-2223) single crystals using different pressure-transmitting media. Previous high-pressure studies have reported conflicting behaviors, ranging from a resurgence of $T_{\rm c}$ of optimally doped Bi-2223 in fluid media to an insulating-like transition in solid media. However, a direct comparison of the effects of different pressure-transmitting media is lacking. Here, we employed wide-field quantum microscopy based on nitrogen-vacancy centers to probe the magnetic response under high pressure, utilizing cBN and KBr as media. We observed that a diamagnetic response near 70 K, indicative of the superconducting transition, persisted up to 23 GPa in KBr, whereas it disappeared above 11 GPa and 70 K in cBN. These results demonstrate the high sensitivity of Bi-2223 to the pressure environment and highlight the critical role of hydrostatic pressure in cuprate superconductors.

Probing the Meissner effect in single crystals of $\mathbf{Bi_2Sr_2Ca_2Cu_3O_{10+δ}}$ via wide-field quantum microscopy under high pressure

Abstract

We investigated the pressure dependence of the superconducting transition temperature () in optimally doped BiSrCaCuO (Bi-2223) single crystals using different pressure-transmitting media. Previous high-pressure studies have reported conflicting behaviors, ranging from a resurgence of of optimally doped Bi-2223 in fluid media to an insulating-like transition in solid media. However, a direct comparison of the effects of different pressure-transmitting media is lacking. Here, we employed wide-field quantum microscopy based on nitrogen-vacancy centers to probe the magnetic response under high pressure, utilizing cBN and KBr as media. We observed that a diamagnetic response near 70 K, indicative of the superconducting transition, persisted up to 23 GPa in KBr, whereas it disappeared above 11 GPa and 70 K in cBN. These results demonstrate the high sensitivity of Bi-2223 to the pressure environment and highlight the critical role of hydrostatic pressure in cuprate superconductors.
Paper Structure (1 section, 4 figures)

This paper contains 1 section, 4 figures.

Table of Contents

  1. DATA AVAILABILITY

Figures (4)

  • Figure 1: (a) Energy diagram of the NV center. (b) Overview of the experimental setup. (c) and (d) Wide-field photoluminescence image of the NV centers inside DAC using (c) KBr and (d) cBN. The red circles indicate the position of Bi-2223. Each scale bar represent 20 $\mu$m. (e) ODMR spectra of NV centers above and outside the superconducting region.
  • Figure 2: Map of the ODMR splitting using KBr as the pressure-transmitting medium. (a)--(c) Results below $T_{\rm c}$ with different pressures. (d) Result above $T_{\rm c}$ at 23 GPa. Each scale bar represents 20 $\mu$m.
  • Figure 3: Map of the ODMR splitting using cBN as the pressure-transmitting medium. (a) and (b) Results below $T_{\rm c}$ with different pressures. (c) Result above $T_{\rm c}$ at 11 GPa. (d) Result after pressure releasing from 19 GPa. Each scale bar represents 20 $\mu$m.
  • Figure 4: Temperature dependence of ODMR splitting. Results using (a) KBr and (b) cBN as the pressure-transmitting media. The shift was calculated as the difference between the mean values of pixels on the sample and those in the background, with error bars representing the combined uncertainty derived from the standard deviations of both pixel groups. Bars represents the onset temperature where the diamagnetic signals are observed.