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  Adaptive modulation in the Ni2Mn1.4In0.6 magnetic shape-memory Heusler alloy

Devi, P., Singh, S., Dutta, B., Manna, K., D'Souza, S. W., Ikeda, Y., et al. (2018). Adaptive modulation in the Ni2Mn1.4In0.6 magnetic shape-memory Heusler alloy. Physical Review B, 97(22): 224102, pp. 1-6. doi:10.1103/PhysRevB.97.224102.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-9403-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-9433-E
Genre: Journal Article

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 Creators:
Devi, P.1, Author              
Singh, Sanjay1, Author              
Dutta, B.2, Author
Manna, K.1, Author              
D'Souza, S. W.1, Author              
Ikeda, Y.2, Author
Suard, E.2, Author
Petricek, V2, Author
Simon, P.3, Author              
Werner, P.2, Author
Chadhov, S.4, Author              
Parkin, Stuart S. P.2, Author
Felser, C.5, Author              
Pandey, D.2, Author
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Paul Simon, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863418              
4Stanislav Chadov, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863440              
5Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: The origin of incommensurate structural modulation in Ni-Mn based Heusler-type magnetic shape-memory alloys (MSMAs) is still an unresolved issue in spite of intense focus on it due to its role in the magnetic field induced ultrahigh strains. In the archetypal MSMA Ni2MnGa, the observation of "nonuniform displacement" of atoms from their mean positions in the modulated martensite phase, premartensite phase, and charge density wave as well as the presence of phason broadening of satellite peaks has been taken in support of the electronic instability model linked with a soft acoustic phonon. We present here results of a combined high-resolution synchrotron x-ray powder diffraction (SXRPD) and neutron powder diffraction (NPD) study on Ni2Mn1.4In0.6 using a (3+1)D superspace group approach, which reveals not only uniform atomic displacements in the modulated structure of the martensite phase with physically acceptable ordered magnetic moments in the antiferromagnetic phase at low temperatures, but also the absence of any premartensite phase and phason broadening of the satellite peaks. Our HRTEM studies and first-principles calculations of the ground state also support uniform atomic displacements predicted by powder diffraction studies. All these observations suggest that the structural modulation in the martensite phase of Ni(2)Mn(1.4)In(0.6 )MSMA can be explained in terms of the adaptive phase model. The present study underlines the importance of superspace group analysis using complementary SXRPD and NPD in understanding the physics of the origin of modulation as well as the magnetic and the modulated ground states of the Heusler-type MSMAs. Our work also highlights the fact that the mechanism responsible for the origin of modulated structure in different Ni-Mn based MSMAs may not be universal and it must be investigated thoroughly in different alloy compositions.

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Language(s): eng - English
 Dates: 2018-06-112018-06-11
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 97 (22) Sequence Number: 224102 Start / End Page: 1 - 6 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008