Low-temperature thermal conductivity of Co\(_{1-x}\)M\(_x\)Si (M=Fe, Ni) alloys
We study the low-temperature electrical and thermal conductivity of CoSi and Co\(_{1-x}\)M\(_x\)Si alloys (M = Fe, Ni; \(x \leq\) 0.06). Measurements show that the low-temperature electrical conductivity of Co\(_{1-x}\)Fe\(_{x}\)Si alloys decreases at \(x > \) 0.01 by an order of magnitude compar...
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| creator | Ivanov, Yu V Levin, A A Novikov, S V Pshenay-Severin, D A Volkov, M P A Yu Zyuzin Burkov, A T Nakama, T Schnatmann, L U Reith, H Nielsch, K |
| description | We study the low-temperature electrical and thermal conductivity of CoSi and Co\(_{1-x}\)M\(_x\)Si alloys (M = Fe, Ni; \(x \leq\) 0.06). Measurements show that the low-temperature electrical conductivity of Co\(_{1-x}\)Fe\(_{x}\)Si alloys decreases at \(x > \) 0.01 by an order of magnitude compared with that of pure CoSi. It was expected that both the lattice and electronic contributions to thermal conductivity would decrease in the alloys. However, our experimental results revealed that at temperatures below 20K the thermal conductivity of Fe- and Ni-containing alloys is several times larger than that of pure CoSi. We discuss possible mechanisms of the thermal conductivity enhancement. The most probable one is related to the dominant scattering of phonons by charge carriers. We propose a simple theoretical model that takes into account the complex semimetallic electronic structure of CoSi with nonequivalent valleys, and show that it explains well the increase of the lattice thermal conductivity with increasing disorder and the linear temperature dependence of the thermal conductivity in the Co\(_{1-x}\)Fe\(_x\)Si alloys below 20K. |
| doi_str_mv | 10.48550/arxiv.2010.00552 |
| format | Article |
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Measurements show that the low-temperature electrical conductivity of Co\(_{1-x}\)Fe\(_{x}\)Si alloys decreases at \(x > \) 0.01 by an order of magnitude compared with that of pure CoSi. It was expected that both the lattice and electronic contributions to thermal conductivity would decrease in the alloys. However, our experimental results revealed that at temperatures below 20K the thermal conductivity of Fe- and Ni-containing alloys is several times larger than that of pure CoSi. We discuss possible mechanisms of the thermal conductivity enhancement. The most probable one is related to the dominant scattering of phonons by charge carriers. We propose a simple theoretical model that takes into account the complex semimetallic electronic structure of CoSi with nonequivalent valleys, and show that it explains well the increase of the lattice thermal conductivity with increasing disorder and the linear temperature dependence of the thermal conductivity in the Co\(_{1-x}\)Fe\(_x\)Si alloys below 20K.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.2010.00552</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Cobalt ; Current carriers ; Electrical resistivity ; Electronic structure ; Heat conductivity ; Heat transfer ; Iron ; Low temperature ; Nickel ; Silicon base alloys ; Temperature ; Temperature dependence ; Thermal conductivity</subject><ispartof>arXiv.org, 2020-10</ispartof><rights>2020. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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Measurements show that the low-temperature electrical conductivity of Co\(_{1-x}\)Fe\(_{x}\)Si alloys decreases at \(x > \) 0.01 by an order of magnitude compared with that of pure CoSi. It was expected that both the lattice and electronic contributions to thermal conductivity would decrease in the alloys. However, our experimental results revealed that at temperatures below 20K the thermal conductivity of Fe- and Ni-containing alloys is several times larger than that of pure CoSi. We discuss possible mechanisms of the thermal conductivity enhancement. The most probable one is related to the dominant scattering of phonons by charge carriers. We propose a simple theoretical model that takes into account the complex semimetallic electronic structure of CoSi with nonequivalent valleys, and show that it explains well the increase of the lattice thermal conductivity with increasing disorder and the linear temperature dependence of the thermal conductivity in the Co\(_{1-x}\)Fe\(_x\)Si alloys below 20K.</description><subject>Cobalt</subject><subject>Current carriers</subject><subject>Electrical resistivity</subject><subject>Electronic structure</subject><subject>Heat conductivity</subject><subject>Heat transfer</subject><subject>Iron</subject><subject>Low temperature</subject><subject>Nickel</subject><subject>Silicon base alloys</subject><subject>Temperature</subject><subject>Temperature dependence</subject><subject>Thermal conductivity</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqNirsKwjAYRoMgKOoDuAVcWrD6Nxetg5NYHLwMOhZK0IiRamqSaov47nbwAZy-wzkfQv0QRiziHMbClOo5IlALAM5JA7UJpWEQMUJaqGftFQDIZEo4p220W-tX4OQtl0a4wkjsLtLcRIaP-n4qjk49lauwPuOFTrz0HQblJ_E3NZaJv1fY28xjOcRb5WORZbqyXdQ8i8zK3m87aBAvD4tVkBv9KKR16VUX5l6nlDAWAZ3MGKf_vb6VSELy</recordid><startdate>20201019</startdate><enddate>20201019</enddate><creator>Ivanov, Yu V</creator><creator>Levin, A A</creator><creator>Novikov, S V</creator><creator>Pshenay-Severin, D A</creator><creator>Volkov, M P</creator><creator>A Yu Zyuzin</creator><creator>Burkov, A T</creator><creator>Nakama, T</creator><creator>Schnatmann, L U</creator><creator>Reith, H</creator><creator>Nielsch, K</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20201019</creationdate><title>Low-temperature thermal conductivity of Co\(_{1-x}\)M\(_x\)Si (M=Fe, Ni) alloys</title><author>Ivanov, Yu V ; 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\(x \leq\) 0.06). Measurements show that the low-temperature electrical conductivity of Co\(_{1-x}\)Fe\(_{x}\)Si alloys decreases at \(x > \) 0.01 by an order of magnitude compared with that of pure CoSi. It was expected that both the lattice and electronic contributions to thermal conductivity would decrease in the alloys. However, our experimental results revealed that at temperatures below 20K the thermal conductivity of Fe- and Ni-containing alloys is several times larger than that of pure CoSi. We discuss possible mechanisms of the thermal conductivity enhancement. The most probable one is related to the dominant scattering of phonons by charge carriers. We propose a simple theoretical model that takes into account the complex semimetallic electronic structure of CoSi with nonequivalent valleys, and show that it explains well the increase of the lattice thermal conductivity with increasing disorder and the linear temperature dependence of the thermal conductivity in the Co\(_{1-x}\)Fe\(_x\)Si alloys below 20K.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.2010.00552</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Cobalt Current carriers Electrical resistivity Electronic structure Heat conductivity Heat transfer Iron Low temperature Nickel Silicon base alloys Temperature Temperature dependence Thermal conductivity |
| title | Low-temperature thermal conductivity of Co\(_{1-x}\)M\(_x\)Si (M=Fe, Ni) alloys |
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