Magnetic fluctuation and first-order transition in trillium lattice of Euptsi observed by 151Eu Mössbauer spectroscopy

Yoshiya Homma, Masashi Kakihana, Yo Tokunaga, Mamoru Yogi, Miho Nakashima, Ai Nakamura, Yusei Shimizu, Dexin Li, Arvind Maurya, Yoshiki J. Sato, Fuminori Honda, Dai Aoki, Yasushi Amako, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

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4 Citations (Scopus)

Abstract

We report the results of 151Eu Mössbauer spectroscopy on EuPtSi with a chiral structure belonging to the P213 (#198) space group at zero magnetic field. The paramagnetic single absorption forms a magnetic splitting profile directly below TN = 4.0 K and the spectrum at 3.9 K consists of the sum of the paramagnetic single absorption and the magnetic splitting absorption, which indicates a first-order transition at TN = 4.0 K. The temperature dependence of the effective hyperfine fields Hhf at the Eu nucleus follows a power law of Hhf = H0(1 − T=TN) β with H0 = 25.6 ± 0.4 T and β = 0.16 ± 0.01 indicates a full moment of Eu2+ ions. The relative integral intensity I of the 151Eu Mössbauer spectroscopy for EuPtSi is enhanced using a Debye calculation below T0 ’ 15 K, which indicates the development of magnetic correlations. The line width Γ of the 151Eu Mössbauer spectra increases below TFD (’ 8 K) close to the Weiss temperature θp and shows a sharp peak at TN. The magnetic behavior of EuPtSi can be divided into three magnetic regions: the paramagnetic (PM) phase, the fluctuation-disordered (FD) phase and the antiferromagnetic phase with fluctuation disordering (AF with FD). The magnetic fluctuation is realized around the first-order transition between the paramagnetic and helimagnetic states in EuPtSi.

Original languageEnglish
Article number094702
Journaljournal of the physical society of japan
Volume88
Issue number9
DOIs
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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