Magnetic phase diagram of the heavy fermion superconductor PrOs 4Sb12

Takashi Tayama*, Toshiro Sakakibara, Hitoshi Sugawara, Yuji Aoki, Hideyuki Sato

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

We investigated the magnetic phase diagram of the first Pr-based heavy fermion superconductor PrOs4Sb12 by means of high-resolution dc magnetization measurements in low temperatures down to 0.06 K. The temperature dependence of the magnetization M(T) at 0.1 kOe exhibits two distinct anomalies at Tc1 = 1.83 K and Tc2 = 1.65 K, in agreement with the specific heat measurements at zero field. Increasing magnetic field H, both TC1(H) and Tc2(H) move toward lower temperatures without showing a tendency of intersecting to each other. Above 10 kOe, the transition at Tc2(H) appears to merge into a line of the peak effect which is observed near the upper critical field Hc2 in the isothermal M(H) curves, suggesting a common origin for these two phenomena. The presence of the field-induced ordered phase (called phase A here) is confirmed for three principal directions above 40 kOe, with the anisotropic A-phase transition temperature TA: TA[100] > TA[111] > TA[110]. The present results are discussed on the basis of crystalline-electrical-field level schemes with a non-magnetic ground state, with emphasis on a ΓI singlet as the possible ground state of Pr3+ in PrOs4 Sb12.

Original languageEnglish
Pages (from-to)1516-1522
Number of pages7
JournalJournal of the Physical Society of Japan
Volume72
Issue number6
DOIs
StatePublished - 2003/06

Keywords

  • Crystalline electric field effect
  • Heavy-fermion superconductor
  • Magnetization
  • Mixed state
  • Phase diagram
  • PrOsSb

ASJC Scopus subject areas

  • General Physics and Astronomy

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