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  Strain and order-parameter coupling in Ni-Mn-Ga Heusler alloys from resonant ultrasound spectroscopy

Salazar Mejía, C., Born, N.-O., Schiemer, J. A., Felser, C., Carpenter, M. A., & Nicklas, M. (2018). Strain and order-parameter coupling in Ni-Mn-Ga Heusler alloys from resonant ultrasound spectroscopy. Physical Review B, 97(9): 094410, pp. 1-9. doi:10.1103/PhysRevB.97.094410.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-226F-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-2DB2-4
Genre: Journal Article

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 Creators:
Salazar Mejía, C.1, Author              
Born, N.-O.1, Author              
Schiemer, J. A.2, Author
Felser, C.3, Author              
Carpenter, M. A.2, Author
Nicklas, M.4, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              
4Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863472              

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 Abstract: Resonant ultrasound spectroscopy and magnetic susceptibility experiments have been used to characterize strain coupling phenomena associated with structural andmagnetic properties of the shape-memory Heusler alloy series Ni50+xMn25-xGa25 (x = 0, 2.5, 5.0, and 7.5). All samples exhibit a martensitic transformation at temperature T-M and ferromagnetic ordering at temperature T-C, while the pure end member (x = 0) also has a premartensitic transition at T-PM, giving four different scenarios: T-C > T-PM > T-M, T-C > TM without premartensitic transition, T-C approximate to T-M, and T-C < T-M. Fundamental differences in elastic properties, i.e., stiffening versus softening, are explained in terms of coupling of shear strains with three discrete order parameters relating to magnetic ordering, a soft mode, and the electronic instability responsible for the large strains typical of martensitic transitions. Linear-quadratic or biquadratic coupling between these order parameters, either directly or indirectly via the common strains, is then used to explain the stabilities of the different structures. Acoustic losses are attributed to critical slowing down at the premartensite transition, to the mobility of interphases between coexisting phases at the martensitic transition, and to mobility of some aspect of the twin walls under applied stress down to the lowest temperatures at which measurements were made.

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Language(s): eng - English
 Dates: 2018-03-122018-03-12
 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 (9) Sequence Number: 094410 Start / End Page: 1 - 9 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008