Observation of a new field-induced phase transition and its concomitant quantum critical fluctuations in CeCo(In1−xZnx)5

Makoto Yokoyama, Hiroaki Mashiko, Ryo Otaka, Yoshiki Oshima, Kohei Suzuki, Kenichi Tenya, Yusei Shimizu, Ai Nakamura, Dai Aoki, Akihiro Kondo, Koichi Kindo, Shota Nakamura, Toshiro Sakakibara

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate a close connection between observed field-induced antiferromagnetic (AFM) order and quantum critical fluctuation (QCF) in the Zn7%-doped heavy-fermion superconductor CeCoIn5. Magnetization, specific heat, and electrical resistivity at low temperatures all show the presence of new field-induced AFM order under the magnetic field B of 5–10 T, whose order parameter is clearly distinguished from the low-field AFM phase observed for B < 5 T and the superconducting phase for B < 3 T. The 4f electronic specific heat divided by the temperature, Ce/T, exhibits − ln T dependence at B ∼ 10 T (≡ B0), and furthermore, the Ce/T data for B ≥ B0 are well scaled by the logarithmic function of B and T: ln[(B − B0)/T2.7]. These features are quite similar to the scaling behavior found in pure CeCoIn5, strongly suggesting that the field-induced QCF in pure CeCoIn5 originates from the hidden AFM order parameter equivalent to high-field AFM order in Zn7%-doped CeCoIn5.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2017 Jun 5

ASJC Scopus subject areas

  • General

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