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Spin liquids and spin glasses in Mn-based alloys with the cubic A13 (βMn) structure
•As-cast samples of doped and undoped Mn100−xZx with Z = Al, Ge, Fe have the beta-Mn structure.•Only the undoped sample is a spin liquid, all others are spin glasses.•Andreev reflection reveals a spin polarization of 8% in the spin glass, but none in the spin liquid.•Fixed spin moment DFT calculatio...
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Published in: | Journal of magnetism and magnetic materials 2020-05, Vol.501, p.166429, Article 166429 |
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creator | Zhang, Rui Gercsi, Zsolt Venkatesan, M. Jha, Ajay Stamenov, Plamen Coey, J.M.D. |
description | •As-cast samples of doped and undoped Mn100−xZx with Z = Al, Ge, Fe have the beta-Mn structure.•Only the undoped sample is a spin liquid, all others are spin glasses.•Andreev reflection reveals a spin polarization of 8% in the spin glass, but none in the spin liquid.•Fixed spin moment DFT calculations show an unusual broad and shallow energy minimum for beta Mn moments from 0 to 0.4 µB.•The depth of the energy minimum, approximately 0.5 meV/atom, is a lower limit on the zero-point energy.
As-cast ingots of Mn100−xZx with Z = Al, Ge, Mn, Fe and Co all have the A13 βMn structure up to some maximum value of x. The magnetic susceptibility of pure βMn is ≈ 9 × 10−4 from 4 to 400 K, but the field-cooled and zero-field-cooled susceptibilities of all doped samples increase at low temperature and they bifurcate at a spin-freezing temperature Tf that increases with x, linearly at first. Point contact Andreev reflection shows evidence of a net spin polarization in a spin glass sample but not in the pure βMn spin liquid. Fixed-moment density functional calculations indicate a very shallow energy minimum (< 1 meV/atom) for the 12d-site Mn moment that extends from x = 0 to 0.4 µB. The minimum energy is interpreted as a lower limit on the zero-point energy. |
doi_str_mv | 10.1016/j.jmmm.2020.166429 |
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As-cast ingots of Mn100−xZx with Z = Al, Ge, Mn, Fe and Co all have the A13 βMn structure up to some maximum value of x. The magnetic susceptibility of pure βMn is ≈ 9 × 10−4 from 4 to 400 K, but the field-cooled and zero-field-cooled susceptibilities of all doped samples increase at low temperature and they bifurcate at a spin-freezing temperature Tf that increases with x, linearly at first. Point contact Andreev reflection shows evidence of a net spin polarization in a spin glass sample but not in the pure βMn spin liquid. Fixed-moment density functional calculations indicate a very shallow energy minimum (< 1 meV/atom) for the 12d-site Mn moment that extends from x = 0 to 0.4 µB. The minimum energy is interpreted as a lower limit on the zero-point energy.</description><identifier>ISSN: 0304-8853</identifier><identifier>EISSN: 1873-4766</identifier><identifier>DOI: 10.1016/j.jmmm.2020.166429</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Aluminum ; Andreev reflection ; Bifurcations ; Freezing ; Ingot casting ; Iron ; Low temperature ; Magnetic permeability ; Magnetic susceptibility ; Manganese base alloys ; Point contact ; Polarization (spin alignment) ; Spin glass ; Spin glasses ; Spin liquid ; Zero point energy</subject><ispartof>Journal of magnetism and magnetic materials, 2020-05, Vol.501, p.166429, Article 166429</ispartof><rights>2020 Elsevier B.V.</rights><rights>Copyright Elsevier BV May 1, 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c328t-c2d7e0caa3a8bcf1c3bd91edc2efb152776a762fa5b93cb8930c91ce555410c33</citedby><cites>FETCH-LOGICAL-c328t-c2d7e0caa3a8bcf1c3bd91edc2efb152776a762fa5b93cb8930c91ce555410c33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958</link.rule.ids></links><search><creatorcontrib>Zhang, Rui</creatorcontrib><creatorcontrib>Gercsi, Zsolt</creatorcontrib><creatorcontrib>Venkatesan, M.</creatorcontrib><creatorcontrib>Jha, Ajay</creatorcontrib><creatorcontrib>Stamenov, Plamen</creatorcontrib><creatorcontrib>Coey, J.M.D.</creatorcontrib><title>Spin liquids and spin glasses in Mn-based alloys with the cubic A13 (βMn) structure</title><title>Journal of magnetism and magnetic materials</title><description>•As-cast samples of doped and undoped Mn100−xZx with Z = Al, Ge, Fe have the beta-Mn structure.•Only the undoped sample is a spin liquid, all others are spin glasses.•Andreev reflection reveals a spin polarization of 8% in the spin glass, but none in the spin liquid.•Fixed spin moment DFT calculations show an unusual broad and shallow energy minimum for beta Mn moments from 0 to 0.4 µB.•The depth of the energy minimum, approximately 0.5 meV/atom, is a lower limit on the zero-point energy.
As-cast ingots of Mn100−xZx with Z = Al, Ge, Mn, Fe and Co all have the A13 βMn structure up to some maximum value of x. The magnetic susceptibility of pure βMn is ≈ 9 × 10−4 from 4 to 400 K, but the field-cooled and zero-field-cooled susceptibilities of all doped samples increase at low temperature and they bifurcate at a spin-freezing temperature Tf that increases with x, linearly at first. Point contact Andreev reflection shows evidence of a net spin polarization in a spin glass sample but not in the pure βMn spin liquid. Fixed-moment density functional calculations indicate a very shallow energy minimum (< 1 meV/atom) for the 12d-site Mn moment that extends from x = 0 to 0.4 µB. The minimum energy is interpreted as a lower limit on the zero-point energy.</description><subject>Aluminum</subject><subject>Andreev reflection</subject><subject>Bifurcations</subject><subject>Freezing</subject><subject>Ingot casting</subject><subject>Iron</subject><subject>Low temperature</subject><subject>Magnetic permeability</subject><subject>Magnetic susceptibility</subject><subject>Manganese base alloys</subject><subject>Point contact</subject><subject>Polarization (spin alignment)</subject><subject>Spin glass</subject><subject>Spin glasses</subject><subject>Spin liquid</subject><subject>Zero point energy</subject><issn>0304-8853</issn><issn>1873-4766</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kMtOwzAQRS0EEqXwA6wssYFFih-JnUhsKsRLasWCsracsUMd5dHaCai_xYfwTSQKa1Yzurp35uogdEnJghIqbstFWdf1ghE2CELELDtCM5pKHsVSiGM0I5zEUZom_BSdhVASQmicihnavO1cgyu3750JWDcGh1H4qHQINuBhXTdRroM1WFdVewj4y3Vb3G0thj53gJeU4-uf73Vzg0Pne-h6b8_RSaGrYC_-5hy9Pz5s7p-j1evTy_1yFQFnaRcBM9IS0JrrNIeCAs9NRq0BZoucJkxKoaVghU7yjEOeZpxARsEmSRJTApzP0dV0d-fbfW9Dp8q2983wUjEuJWciTtjgYpMLfBuCt4XaeVdrf1CUqJGeKtVIT4301ERvCN1NITv0_3TWqwDONmCN8xY6ZVr3X_wXzpR4dw</recordid><startdate>20200501</startdate><enddate>20200501</enddate><creator>Zhang, Rui</creator><creator>Gercsi, Zsolt</creator><creator>Venkatesan, M.</creator><creator>Jha, Ajay</creator><creator>Stamenov, Plamen</creator><creator>Coey, J.M.D.</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20200501</creationdate><title>Spin liquids and spin glasses in Mn-based alloys with the cubic A13 (βMn) structure</title><author>Zhang, Rui ; Gercsi, Zsolt ; Venkatesan, M. ; Jha, Ajay ; Stamenov, Plamen ; Coey, J.M.D.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c328t-c2d7e0caa3a8bcf1c3bd91edc2efb152776a762fa5b93cb8930c91ce555410c33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Aluminum</topic><topic>Andreev reflection</topic><topic>Bifurcations</topic><topic>Freezing</topic><topic>Ingot casting</topic><topic>Iron</topic><topic>Low temperature</topic><topic>Magnetic permeability</topic><topic>Magnetic susceptibility</topic><topic>Manganese base alloys</topic><topic>Point contact</topic><topic>Polarization (spin alignment)</topic><topic>Spin glass</topic><topic>Spin glasses</topic><topic>Spin liquid</topic><topic>Zero point energy</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhang, Rui</creatorcontrib><creatorcontrib>Gercsi, Zsolt</creatorcontrib><creatorcontrib>Venkatesan, M.</creatorcontrib><creatorcontrib>Jha, Ajay</creatorcontrib><creatorcontrib>Stamenov, Plamen</creatorcontrib><creatorcontrib>Coey, J.M.D.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of magnetism and magnetic materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhang, Rui</au><au>Gercsi, Zsolt</au><au>Venkatesan, M.</au><au>Jha, Ajay</au><au>Stamenov, Plamen</au><au>Coey, J.M.D.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spin liquids and spin glasses in Mn-based alloys with the cubic A13 (βMn) structure</atitle><jtitle>Journal of magnetism and magnetic materials</jtitle><date>2020-05-01</date><risdate>2020</risdate><volume>501</volume><spage>166429</spage><pages>166429-</pages><artnum>166429</artnum><issn>0304-8853</issn><eissn>1873-4766</eissn><abstract>•As-cast samples of doped and undoped Mn100−xZx with Z = Al, Ge, Fe have the beta-Mn structure.•Only the undoped sample is a spin liquid, all others are spin glasses.•Andreev reflection reveals a spin polarization of 8% in the spin glass, but none in the spin liquid.•Fixed spin moment DFT calculations show an unusual broad and shallow energy minimum for beta Mn moments from 0 to 0.4 µB.•The depth of the energy minimum, approximately 0.5 meV/atom, is a lower limit on the zero-point energy.
As-cast ingots of Mn100−xZx with Z = Al, Ge, Mn, Fe and Co all have the A13 βMn structure up to some maximum value of x. The magnetic susceptibility of pure βMn is ≈ 9 × 10−4 from 4 to 400 K, but the field-cooled and zero-field-cooled susceptibilities of all doped samples increase at low temperature and they bifurcate at a spin-freezing temperature Tf that increases with x, linearly at first. Point contact Andreev reflection shows evidence of a net spin polarization in a spin glass sample but not in the pure βMn spin liquid. Fixed-moment density functional calculations indicate a very shallow energy minimum (< 1 meV/atom) for the 12d-site Mn moment that extends from x = 0 to 0.4 µB. The minimum energy is interpreted as a lower limit on the zero-point energy.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jmmm.2020.166429</doi></addata></record> |
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subjects | Aluminum Andreev reflection Bifurcations Freezing Ingot casting Iron Low temperature Magnetic permeability Magnetic susceptibility Manganese base alloys Point contact Polarization (spin alignment) Spin glass Spin glasses Spin liquid Zero point energy |
title | Spin liquids and spin glasses in Mn-based alloys with the cubic A13 (βMn) structure |
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