Magnetic, thermodynamic, and electrical transport properties of the noncentrosymmetric B20 germanides MnGe and CoGe
| العنوان: | Magnetic, thermodynamic, and electrical transport properties of the noncentrosymmetric B20 germanides MnGe and CoGe |
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| المؤلفون: | Zachary Fisk, Cigdem Capan, Julia Y. Chan, Joseph Prestigiacomo, M. I. Brickson, John Ditusa, Dana A. Browne, Bradford W. Fulfer, S. B. Zhang, Kazunari Yamaura, Yimin Xiong, Philip W. Adams |
| المصدر: | Ditusa, JF; Zhang, SB; Yamaura, K; Xiong, Y; Prestigiacomo, JC; Fulfer, BW; et al.(2014). Magnetic, thermodynamic, and electrical transport properties of the noncentrosymmetric B20 germanides MnGe and CoGe. Physical Review B-Condensed Matter and Materials Physics, 90(14). doi: 10.1103/PhysRevB.90.144404. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/83h0f4v2 |
| سنة النشر: | 2014 |
| مصطلحات موضوعية: | Phase transition, Materials science, Strongly Correlated Electrons (cond-mat.str-el), Magnetic structure, Magnetoresistance, Condensed matter physics, FOS: Physical sciences, Condensed Matter Physics, 7. Clean energy, Magnetic susceptibility, Electronic, Optical and Magnetic Materials, Magnetization, Condensed Matter - Strongly Correlated Electrons, Hall effect, Curie temperature, Diamagnetism, Condensed Matter::Strongly Correlated Electrons |
| الوصف: | We present magnetization, specific heat, resistivity, and Hall effect measurements on the cubic B20 phase of MnGe and CoGe and compare to measurements of isostructural FeGe and electronic structure calculations. In MnGe, we observe a transition to a magnetic state at $T_c=275$ K as identified by a sharp peak in the ac magnetic susceptibility, as well as second phase transition at lower temperature that becomes apparent only at finite magnetic field. We discover two phase transitions in the specific heat at temperatures much below the Curie temperature one of which we associate with changes to the magnetic structure. A magnetic field reduces the temperature of this transition which corresponds closely to the sharp peak observed in the ac susceptibility at fields above 5 kOe. The second of these transitions is not affected by the application of field and has no signature in the magnetic properties or our crystal structure parameters. Transport measurements indicate that MnGe is metal with a negative magnetoresistance similar to that seen in isostructural FeGe and MnSi. Hall effect measurements reveal a carrier concentration of about 0.5 carriers per formula unit also similar to that found in FeGe and MnSi. CoGe is shown to be a low carrier density metal with a very small, nearly temperature independent diamagnetic susceptibility. 16 pages 23 figures |
| وصف الملف: | application/pdf |
| اللغة: | English |
| DOI: | 10.1103/PhysRevB.90.144404. |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0cfa408cc1839a150e0ab8e5435353b2 http://arxiv.org/abs/1407.2968 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....0cfa408cc1839a150e0ab8e5435353b2 |
| قاعدة البيانات: | OpenAIRE |
| DOI: | 10.1103/PhysRevB.90.144404. |
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