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Magnetization Curves of TbZn2 in High Magnetic Fields
Yoshiya Adachi,Tetsuo Kitai,Keiichi Koyama,Hajime Yoshida,Takejiro Kaneko 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetization of a single-crystalline sample of TbZn2 was measured under high magneticfields up to 180 kOe in the temperature range from 4.2 to 90 K. The metamagnetic transitionswere observed in the directions of all axes at temperatures below TN and along the c-axis attemperatures above TN. The metamagnetic transition field HM along the c-axis at temperaturesabove TN increases with increasing temperature.
Multi-step Metamagnetic Processes of PrPd2Si2 Single Crystal
Toru Shigeoka,Tetsuya Fujiwara,Keiichi Koyama,Shojiro Kimura,Kazuo Watanabe 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Magnetic studies were performed on PrPd2Si2 single crystals which crystallize in the tetragonalThCr2Si2-type structure. The temperature dependence of the magnetic susceptibility indicates thatthe compound orders antiferromagnetically at temperatures below TN = 3.2 K. The transition wasconfirmed by specific heat measurements. Magnetization measurements at fields up to 18 T showthat the easy magnetization direction is the [100] direction in the basal plane. In the magnetizationprocess, five or four metamagnetic transitions appear; the process is a five (four)-step metamagneticone. The [110] magnetization process is a three-step one. A strong magnetic anisotropy betweenthe [100] and [110] directions is observed within the basal plane for high magnetic fields. Alongthe hard magnetization direction of the c-axis, a metamagnetic transition appears. The B[100] − Tphase diagram was constructed. A magnetic anisotropy between the [100] and [001] directions isalso strong. These behaviors are discussed based on an analysis of crystalline field effects.
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.
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.
Thermal Analysis on MnBi in High Magnetic Fields up to 45 T
Yoshifuru Mitsui,Yuki Ikehara,Kazuo Watanbe,Eun Sang Choi,Eric C. Palm,Keiichi Koyama 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Differential thermal analysis (DTA) equipment for utilization in a high magnetic field of 45 T wasdeveloped. From the DTA experiments, the decomposition temperature (MnBi ! Mn1.08Bi+liquid:632 K at zero field) Tt was found to increase linearly at a rate of 2 KT−1 in fields up to 18 T andto deviate from that linear increase above 20 T. In addition, the peritectic temperature (Mn1.08Bi! Mn + liquid: 721 K at zero field) Tm was slightly increased by applying a magnetic field. At amagnetic field of 45 T, Tt and Tm reached 714 K and 726 K, respectively. The behaviors of Tt andTm for MnBi and Mn1.08Bi under high magnetic fields are discussed, and the magnetic energies arecalculated on the basis of mean field theory.