Effect of pressure and magnetic field on the superconducting state of a heavy fermion superconductor NpPd5Al2

Fuminori Honda, Rikio Settai, Dai Aoki, Yoshinori Haga, Tatsuma D. Matsuda, Naoyuki Tateiwa, Shugo Ikeda, Yoshiya Homma, Hironori Sakai, Yoshinobu Shiokawa, Etsuji Yamamoto, Akio Nakamura, Yoshichika Onuki

研究成果: Article査読

17 被引用数 (Scopus)

抄録

We have carried out the electrical resistivity measurements under high pressures and high magnetic fields in NpPd5Al2 in order to investigate a quantum critical behavior and the stability of the superconducting phase. A T-linear dependence of the electrical resistivity is changed into the Fermi liquid relation of ρ ∼ AT2 under the magnetic fields, and A value indicates a divergent feature around the upper critical field Hc2, indicating the existence of a field-tuned quantum critical point (QCP) around Hc2. With increasing pressure, the superconducting transition temperature Tsc decreases and becomes zero above 5.7 GPa, together with a decrease of the upper critical field, indicating that the electronic state of NpPd5Al2 is located in the vicinity of QCP at ambient pressure and deviates from QCP with increasing pressure. Furthermore, we have constructed the superconducting phase diagram at 3.71 GPa.

本文言語English
ページ(範囲)339-341
ページ数3
ジャーナルjournal of the physical society of japan
77
SUPPL.A
DOI
出版ステータスPublished - 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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