Unique pressure versus temperature phase diagram for antiferromagnets Eu2Ni3Ge5 and EuRhSi3

Miho Nakashima, Yasushi Amako, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Masato Nada, Kiyohiro Sugiyama, Masayuki Hagiwara, Yoshinori Haga, Tetsuya Takeuchi, Ai Nakamura, Hiromu Akamine, Keisuke Tomori, Tomoyuki Yara, Yosuke Ashitomi, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

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5 Citations (Scopus)

Abstract

We studied the magnetic properties of the antiferromagnets Eu2Ni3Ge5 and EuRhSi3 by measuring their electrical resistivity, specific heat, magnetic susceptibility, magnetization, and thermoelectric power, together with the electrical resistivities at high pressures of up to 15 GPa. These compounds have almost divalent Eu ions at ambient pressure and order antiferromagnetically with a successive change in the antiferromagnetic structure at TN = 19 K and TN′ = 17 K in Eu2Ni3Ge5, and at TN = 49 K and TN = 45 K in EuRhSi3. Magnetic field versus temperature (H-T) phase diagrams were constructed for both compounds from the magnetization measurements. The Néel temperature in Eu2Ni3Ge5 was found to increase up to 7 GPa but to decrease continuously with further increasing pressure, without the so-called valence transition. Under a high pressure of 15 GPa, Kondo-like behavior of the electrical resistivity was observed, suggesting the existence of the heavy-fermion state at low temperatures. A similar trend is likely to occur in EuRhSi3. The present P-T phase diagrams for both compounds are the first cases that are reminiscent of the phase diagram of EuCu2(SixGe1-x)2.

Original languageEnglish
Article number034708
Journaljournal of the physical society of japan
Volume86
Issue number3
DOIs
Publication statusPublished - 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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