Campbell penetration depth in single crystals of CaPd$_2$Ge$_2$ superconductor

ORAL

Abstract

The low-amplitude AC magnetic penetration depth (Campbell length) was measured in a single crystal of CaPd$_2$Ge$_2$ using tunnel diode resonator in a dilution refrigerator down to 100 mK and in the presence of a DC magnetic field. Depending on cooling and warming protocol, hysteretic behavior was found for the most part of the mixed state in fields ranging from 10 Oe to 800 Oe with the strongest irreversibility near H = 300 Oe. The results are analyzed in terms of a recently developed model based on the microscopic theory of strong vortex pinning.

*This work was supported by the USDOE/Office of Science BES Materials Science and Engineering Division under contract $\#$ DE-AC02-07CH11358.

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Authors

  • Kyuil Cho

    • Ames Laboratory and Iowa State University, USA

  • Serafim Teknowijoyo

    • Ames Laboratory and Iowa State University, USA

  • Makariy A. Tanatar

    • Ames Laboratory and Iowa State University, USA

  • Vivek K. Anand

    • Ames Laboratory and Iowa State University, USA

  • David C. Johnston

    • Ames Laboratory and Iowa State University, USA

  • Ruslan Prozorov

    • Ames Laboratory and Iowa State University, USA

  • Roland Willa

    • Argonne National Laboratory, USA