Low-Pressure Magnetic Susceptibility Study in λ-(BETS)₂GaCl₄

Abstract:

We have measured the pressure dependence of T_c and superconducting volume fraction in λ-(BETS)₂GaCl₄. The sample was put inside a pressure cell with Tin used as the manometer and was measured by SQUID magnetometer. We confirmed the formation of a superconducting dome structure in comparison with resistivity measurement reported in [M. Ueno, et al., Interactions 245, 71 (2024)]. The systematic suppression of the upturn anomaly from the resistivity measurement within 0.13 < P < 0.28 GPa was observed followed with the increase in the superconducting volume fraction at 0.13(1) GPa, before then decrease in slightly pressure at P = 0.32(2) GPa indicates the possible scenario of quantum criticality in the narrow pressure region. We described in detail how to determine the pressure from the manometer and the origin of suppression in superconducting volume fraction in correlation with the pressure dependence of resistivity which shows a clear deviation from normal Fermi liquid. A possible scenario related to a quantum phase transition in a narrow pressure region is discussed.

• Periodical: Materials Science Forum (Volume 1152)
• Pages: 75-81
• DOI: https://doi.org/10.4028/p-8p6iT5
• Online since: June 2025
• Authors: Aulia Anisa Firdaus*, Dita Puspita Sari, Masaki Ueno, Ryota Nomura, Naoto Katusoka, Anita Eka Putri, Isao Watanabe, T. Suzuki, Yasuyuki Ishii
• Keywords: Low-Pressure, Non-Fermi Liquid, Superconducting Volume Fraction

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