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Slow Spin Dynamics in Superconducting Ca0.9Ce0.1Fe2As2.

K Nadeem1, W Zhang2, D Y Chen3

  • 11] Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China [2] Department of Physics, International Islamic University, H-10, Islamabad 44000, Pakistan.

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|May 30, 2015
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Summary
This summary is machine-generated.

Superconducting Ca0.9Ce0.1Fe2As2 exhibits spin-glass-like behavior and slow spin dynamics. These phenomena coexist with superconductivity, potentially due to Ce spin ordering or magnetic frustration.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Under-doped iron-based superconductors like Ca$_{0.9}$Ce$_{0.1}$Fe$_2$As$_2$ exhibit complex magnetic and electronic properties.
  • Understanding the interplay between magnetism and superconductivity is crucial for developing advanced materials.

Purpose of the Study:

  • To investigate the slow spin dynamics and spin-glass-like behavior in superconducting Ca$_{0.9}$Ce$_{0.1}$Fe$_2$As$_2$ single crystals.
  • To explore the coexistence of slow spin dynamics and superconductivity in this material.

Main Methods:

  • Temperature-dependent resistivity measurements with cooling and warming protocols.
  • Zero-field-cooled/field-cooled (ZFC/FC) magnetization measurements.
  • Analysis of magnetic hysteresis and AC memory effect.

Main Results:

  • A first-order tetragonal to orthorhombic structural transition with simultaneous magnetic transition observed below 100 K.
  • Evidence of spin-glass-like behavior, including ZFC peak, FC plateau, and slow spin relaxation, observed at 32 K.
  • Weak spin-glass behavior that diminishes at higher magnetic fields.

Conclusions:

  • The observed slow spin dynamics in Ca$_{0.9}$Ce$_{0.1}$Fe$_2$As$_2$ are attributed to inhomogeneous Ce spin distribution or magnetic frustration between Fe and Ce spins.
  • These findings confirm the coexistence of slow spin dynamics and superconductivity in this single crystal.