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Magnetic phase diagram of the ferromagnetic Kondo-lattice compound CeAgSb2up to 80 kbar

  • Author(s): Sidorov, VA
  • Bauer, ED
  • Frederick, NA
  • Jeffries, JR
  • Nakatsuji, S
  • Moreno, NO
  • Thompson, JD
  • Maple, MB
  • Fisk, Z
  • et al.
Abstract

Electrical resistivity and ac-calorimetric measurements reveal a complex magnetic phase diagram for single crystals of the ferromagnetic Kondo-lattice compound CeAgSb2at high pressures up to 80 kbar. The ferromagnetic order at TC= 9.6 K at ambient pressure is completely suppressed at a critical pressure PC= 35 kbar. Another magnetic transition, possibly antiferromagnetic, found above 27 kbar, attains a maximum value TN6 K at 44 kbar and then appears to be completely suppressed by 50 kbar. Thermodynamic and transport measurements in the ferromagnetic state indicate an energy gap Δ 30 K in the spin-wave excitation spectrum at ambient pressure which decreases to Δ 10 K at P = 30 kbar. No superconductivity is observed at ambient pressure above T 0.1 K, under applied pressure in the ferromagnetic state (P = 28.5 kbar), nor in the antiferromagnetic state (P = 33 − 46 kbar) above 0.3 K. © 2003 The American Physical Society.

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