Magnetothermal transport in spin-ladder systems
We study a theoretical model for the magnetothermal conductivity of a spin-[1/2] ladder with low exchange coupling (J
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| Veröffentlicht in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-08, Vol.86 (7), Article 075442 |
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| container_title | Physical review. B, Condensed matter and materials physics |
| container_volume | 86 |
| creator | Shlagman, Ofer Shimshoni, Efrat |
| description | We study a theoretical model for the magnetothermal conductivity of a spin-[1/2] ladder with low exchange coupling (J |
| doi_str_mv | 10.1103/PhysRevB.86.075442 |
| format | Article |
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Our theory for the thermal transport accounts for the contribution of spinons coupled to lattice phonon modes in the one-dimensional lattice. We employ a mapping of the ladder Hamiltonian onto an XXZ spin chain in a weaker effective field B sub(eff) = B - B sub(0), where (ProQuest: Formulae and/or non-USASCII text omitted) corresponds to half-filling of the spinon band. This provides a low-energy theory for the spinon excitations and their coupling to the phonons. The coupling of acoustic longitudinal phonons to spinons gives rise to hybridization of spinons and phonons, and provides an enhanced B-dependent scattering of phonons on spinons. Using a memory-matrix approach, we show that the interplay between several scattering mechanisms, namely, umklapp, disorder, and phonon-spinon collisions, dominates the relaxation of heat current. This yields magnetothermal effects that are qualitatively consistent with the thermal conductivity measurements in the spin-[1/2] ladder compound Br sub(4) (C sub(5)H sub(12)N) sub(2) (BPCB).</description><identifier>ISSN: 1098-0121</identifier><identifier>EISSN: 1550-235X</identifier><identifier>DOI: 10.1103/PhysRevB.86.075442</identifier><language>eng</language><subject>Condensed matter ; Joining ; Ladders ; Lattices ; Phonons ; Scattering ; Thermal conductivity ; Transport</subject><ispartof>Physical review. 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B, Condensed matter and materials physics</title><description>We study a theoretical model for the magnetothermal conductivity of a spin-[1/2] ladder with low exchange coupling (J << [Theta] sub(D)) subject to a strong magnetic field B. Our theory for the thermal transport accounts for the contribution of spinons coupled to lattice phonon modes in the one-dimensional lattice. We employ a mapping of the ladder Hamiltonian onto an XXZ spin chain in a weaker effective field B sub(eff) = B - B sub(0), where (ProQuest: Formulae and/or non-USASCII text omitted) corresponds to half-filling of the spinon band. This provides a low-energy theory for the spinon excitations and their coupling to the phonons. The coupling of acoustic longitudinal phonons to spinons gives rise to hybridization of spinons and phonons, and provides an enhanced B-dependent scattering of phonons on spinons. Using a memory-matrix approach, we show that the interplay between several scattering mechanisms, namely, umklapp, disorder, and phonon-spinon collisions, dominates the relaxation of heat current. This yields magnetothermal effects that are qualitatively consistent with the thermal conductivity measurements in the spin-[1/2] ladder compound Br sub(4) (C sub(5)H sub(12)N) sub(2) (BPCB).</description><subject>Condensed matter</subject><subject>Joining</subject><subject>Ladders</subject><subject>Lattices</subject><subject>Phonons</subject><subject>Scattering</subject><subject>Thermal conductivity</subject><subject>Transport</subject><issn>1098-0121</issn><issn>1550-235X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNo1kDtLA0EURgdRMEb_gNWWNpvcO-8tNWgUIooo2A2T3Rmzsi_nboT8eyPR6vuKwykOY5cIM0QQ8-fNjl7C983M6hkYJSU_YhNUCnIu1Pvx_kNhc0COp-yM6BMAZSH5hM0f_UcXxn7chNT6JhuT72jo05jVXUZD3eWNr6qQMtrRGFo6ZyfRNxQu_nbK3u5uXxf3-epp-bC4XuWl4HLMtVprFRF1GWXBI5droQx6sAUvqjWW4E00VRSVslaB9MKr6EWAKmBAyZWYsquDd0j91zbQ6NqaytA0vgv9lhwaKAzX2tg9yg9omXqiFKIbUt36tHMI7reO-6_jrHaHOuIHo4tZng</recordid><startdate>20120820</startdate><enddate>20120820</enddate><creator>Shlagman, Ofer</creator><creator>Shimshoni, Efrat</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20120820</creationdate><title>Magnetothermal transport in spin-ladder systems</title><author>Shlagman, Ofer ; Shimshoni, Efrat</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c324t-65b65f116cf492f24b3571a08929db1c0a7f7df3d588504a3a5fa3e0de1e14253</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Condensed matter</topic><topic>Joining</topic><topic>Ladders</topic><topic>Lattices</topic><topic>Phonons</topic><topic>Scattering</topic><topic>Thermal conductivity</topic><topic>Transport</topic><toplevel>online_resources</toplevel><creatorcontrib>Shlagman, Ofer</creatorcontrib><creatorcontrib>Shimshoni, Efrat</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physical review. 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| ispartof | Physical review. B, Condensed matter and materials physics, 2012-08, Vol.86 (7), Article 075442 |
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| language | eng |
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| source | American Physical Society Journals |
| subjects | Condensed matter Joining Ladders Lattices Phonons Scattering Thermal conductivity Transport |
| title | Magnetothermal transport in spin-ladder systems |
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