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Title: Magnetic field dependence of electrical resistivity and thermopower in Ni{sub 50}Mn{sub 37}Sn{sub 13} ribbons

We report magnetization, magnetoresistance (MR) and magnetothermopower (MTEP) of melt spun Ni{sub 50}Mn{sub 37}Sn{sub 13} ribbons which exhibit an austentite to martensite phase transition at a temperature (T{sub M}) ≈ 294 K. Upon cooling from 400 K, dc-resistivity and thermopower show abrupt changes at T{sub M}, indicating a change in the electronic density of states. The thermopower is negative from 400 K down to 10 K. Application of a magnetic field of μ{sub 0}H = 5 T decreases T{sub M} by 5 K and induces large negative MR (-23%) but positive MTEP (9%) near T{sub M}. While the MR is appreciable from T{sub M} down to 10 K, MTEP is significant only below 60 K (MR = -2.5% and MTEP = +300% at 10 K). The magnetic field dependence of resistivity and thermopower show either reversible or irreversible behavior near T{sub M}, depending on whether the sample is zero-field cooled or field-cooled, which indicates that the electronic band structure near T{sub M} is magnetic history dependent.
Authors:
; ;  [1] ;  [2]
  1. School of Materials Science and Engineering, Nanyang Technological University, 639798 (Singapore)
  2. Department of Physics, Faculty of Science, National University of Singapore, 117551 (Singapore)
Publication Date:
OSTI Identifier:
22492343
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 9; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DENSITY OF STATES; ELECTRIC CONDUCTIVITY; ELECTRONIC STRUCTURE; MAGNETIC FIELDS; MAGNETIZATION; MAGNETORESISTANCE; MANGANESE ALLOYS; MARTENSITE; NICKEL BASE ALLOYS; PHASE TRANSFORMATIONS; TEMPERATURE DEPENDENCE; THERMOELECTRICITY; TIN ALLOYS