Thermal Properties of Heavy Fermion Compound YbP.

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  • Tateiwa Naoyuki
    Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531
  • Kobayashi Tatsuo C.
    Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531
  • Amaya Kiichi
    Department of Physical Science, Grasuate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531
  • LI Dexin
    Oarai Branch, Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313
  • Shiokawa Yoshinobu
    Oarai Branch, Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313
  • Suzuki Takashi
    Physics Department, Graduate School of Science, Tohoku University, Sendai 980-8545

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Low-temperature specific heat and its field-dependence up to 16 T was measured in a stoichiometric single crystal of YbP. A sharp peak was observed at TN = 0.53 K in zero magnetic field. Application of external field seems to induce a new magnetic phase above 11 T. The field dependence of the transition temperature in the high-field phase is different from that of the low field phase. The linear coefficient of the electronic specific heat is estimated as 120 mJ/mol·K2 from low temperature specfic heat, suggesting heavy Fermion state in YbP.

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