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Antiferromagnetic Transition in Ru2CrSi in Magnetic Fields
Masahiko Hiroi,Kaori Uchida,Iduru Shigeta,Masakazu Ito,Keiichi Koyama,Shojiro Kimura,Kazuo Watanabe 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
In the Heusler compound Ru2CrSi, an antiferromagnetic transition at TN =14 K was revealed byspecific heat and magnetization measurements. In this study the electrical resistivity is measured inmagnetic fields up to 14.5 T, and the antiferromagnetic transition in magnetic fields is investigated. In the temperature dependence of the resistivity at zero field, a clear dip at 15 K and a humpwith a maximum at 9 K are observed. This dip is considered to be due to the antiferromagnetictransition. With increasing magnetic field, the magnitude of the resistivity slightly increases aroundTN; i.e., a positive magnetoresistance is observed. The temperature dependence of the resistivityis hardly affected by increasing the magnetic field. The transition temperature decreases only by 0.3 K even with applying 14.5 T. These results demonstrate that the antiferromagnetic state inRu2CrSi is unusually unaffected by a strong magnetic field.
Thermodynamic and Transport Properties of Ru2−xFexCrSi (1.3 ≤ x ≤ 1.8)
Masakazu Ito,Toru Hisamatsu,Tsugumi Rokkaku,Osamu Murayama,Iduru Shigeta,Masahiko Hiroi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have measured the temperature (T) dependences of the electric resistivity, ρ(T), and thespecific heat, Cp(T), of the ferromagnetic full-Heusler compound Ru2−xFexCrSi (1.3 ≤ x ≤ 1.8). ρ(T) shows a metallic behavior (@ρ/@T > 0) for 20 . T ≤ 300 K and nominal upturn at around20 K for all samples. In the low-temperature range, Cp(T) can be described by Debye’s T3 law. Although the coefficient of the lattice part of Cp(T), β, is insensitive for the Fe concentration x,the electronic specific heat part, , decreases with increasing x. The values of the total densities ofstates (Dtotal(EF )) estimated fromwere 12.8, 10.1, and 9.6 states/f.u. eV for x = 1.3, 1.6, and1.8, respectively. The values of majority spin band (D"(EF )) and the minority spin band (D#(EF ))were also estimated usingand the spin polarization P defined by Andreev-reflection experiments.
Magnetic Properties of Mn2Sb1−xGex (0.05 ≤ x ≤ 0.2) in High Magnetic Fields
Daisuke Shimada,Hiroki Orihashi,Daisuke Mitsunaga,Masakazu Ito,Masahiko Hiroi,Keiichi Koyama,Reisho Onodera,Kohki Takahashi,Kazuyuki Matsubayashi,Yoshiya Uwatoko 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Magnetization and electrical resistivity measurements were carried out for polycrystallineMn2Sb1−xGex (0.05 ≤ x ≤ 0.2) in magnetic fields up to 16 T in the 4.2 - 600 K temperaturerange in order to investigate the magnetic and the electrical properties under high magnetic fields. Mn2Sb0.92Ge0.08 showed a Curie temperature, TC, of 532 K and a first order magnetic transitionfrom a ferrimagnetic (FRI) to an antiferromagnetic (AFM) phase at Tt = 230 K with decreasingtemperature in a zero magnetic field. With increasing x, TC decreased and Tt increased. ForMn2Sb0.92Ge0.08, a matamagnetic transition from an AFM to a FRI phase was observed at 215 K. The magnetic phase diagram of Mn2Sb1−xGex is presented.