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Title: Investigations on the electronic transport and piezoresistivity properties of Ni{sub 2−X}Mn{sub 1+X}Ga (X = 0 and 0.15) Heusler alloys under hydrostatic pressure

The resisitivity of Ni{sub 2−X}Mn{sub 1+X}Ga (X = 0 and 0.15) magnetic shape memory alloys has been investigated as a function of temperature (4–300 K) and hydrostatic pressure up to 30 kilobars. The resistivity is suppressed (X = 0) and enhanced (X = 0.15) with increasing pressure. A change in piezoresistivity with respect to pressure and temperature is observed. The negative and positive piezoresistivity increases with pressure for both the alloys. The residual resistivity and electron-electron scattering factor as a function of pressure reveal that for Ni{sub 2}MnGa the electron-electron scattering is predominant, while the X = 0.15 specimen is dominated by the electron-magnon scattering. The value of electron-electron scattering factor is positive for both the samples, and it is decreasing (negative trend) for Ni{sub 2}MnGa and increasing (positive trend) for X = 0.15 with pressure. The martensite transition temperature is found to be increased with the application of external pressure for both samples.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [2]
  1. Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli-620 024 (India)
  2. UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore-452001, Madhya Pradesh (India)
  3. (Germany)
  4. (France)
Publication Date:
OSTI Identifier:
22395581
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 25; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRIC CONDUCTIVITY; ELECTRON-ELECTRON COLLISIONS; ELECTRONS; GALLIUM; HEUSLER ALLOYS; INTERMETALLIC COMPOUNDS; MANGANESE; MARTENSITE; NICKEL; PRESSURE DEPENDENCE; SCATTERING; SHAPE MEMORY EFFECT; TEMPERATURE DEPENDENCE; TRANSITION TEMPERATURE