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Schubert M, Schaefer H, Mayer J, et al. Collective Modes and Structural Modulation in Ni-Mn-Ga(Co) Martensite Thin Films Probed by Femtosecond Spectroscopy and Scanning Tunneling Microscopy. Phys Rev Lett. 2015;115(7):076402doi: 10.1103/PhysRevLett.115.076402.
Schubert, M., Schaefer, H., Mayer, J., Laptev, A., Hettich, M., Merklein, M., He, C., Rummel, C., Ristow, O., Großmann, M., Luo, Y., Gusev, V., Samwer, K., Fonin, M., Dekorsy, T., & Demsar, J. (2015). Collective Modes and Structural Modulation in Ni-Mn-Ga(Co) Martensite Thin Films Probed by Femtosecond Spectroscopy and Scanning Tunneling Microscopy. Physical review letters, 115(7), 076402. https://doi.org/10.1103/PhysRevLett.115.076402
Schubert, M, et al. "Collective Modes and Structural Modulation in Ni-Mn-Ga(Co) Martensite Thin Films Probed by Femtosecond Spectroscopy and Scanning Tunneling Microscopy." Physical review letters vol. 115,7 (2015): 076402. doi: https://doi.org/10.1103/PhysRevLett.115.076402
Schubert M, Schaefer H, Mayer J, Laptev A, Hettich M, Merklein M, He C, Rummel C, Ristow O, Großmann M, Luo Y, Gusev V, Samwer K, Fonin M, Dekorsy T, Demsar J. Collective Modes and Structural Modulation in Ni-Mn-Ga(Co) Martensite Thin Films Probed by Femtosecond Spectroscopy and Scanning Tunneling Microscopy. Phys Rev Lett. 2015 Aug 14;115(7):076402. doi: 10.1103/PhysRevLett.115.076402. Epub 2015 Aug 13. PMID: 26317735.
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Phys Rev Lett. 2015 Aug 14;115(7):076402. doi: 10.1103/PhysRevLett.115.076402. Epub 2015 Aug 13.

Collective Modes and Structural Modulation in Ni-Mn-Ga(Co) Martensite Thin Films Probed by Femtosecond Spectroscopy and Scanning Tunneling Microscopy.

Physical review letters

M Schubert, H Schaefer, J Mayer, A Laptev, M Hettich, M Merklein, C He, C Rummel, O Ristow, M Großmann, Y Luo, V Gusev, K Samwer, M Fonin, T Dekorsy, J Demsar

Affiliations

  1. Department of Physics, University of Konstanz, 78457 Konstanz, Germany.
  2. Institute of Physics, Ilmenau University of Technology, 98693 Ilmenau, Germany.
  3. I. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen, Germany.
  4. Laboratoire d'Acoustique, LAUM, UMR CNRS 6613, LUNAM Université, Université du Maine, 72085 Le Mans, France.
  5. Institute of Physics, Johannes Gutenberg-University Mainz, 55128 Mainz, Germany.

PMID: 26317735 DOI: 10.1103/PhysRevLett.115.076402

Abstract

The origin of the martensitic transition in the magnetic shape memory alloy Ni-Mn-Ga has been widely discussed. While several studies suggest it is electronically driven, the adaptive martensite model reproduced the peculiar nonharmonic lattice modulation. We used femtosecond spectroscopy to probe the temperature and doping dependence of collective modes, and scanning tunneling microscopy revealed the corresponding static modulations. We show that the martensitic phase can be described by a complex charge-density wave tuned by magnetic ordering and strong electron-lattice coupling.

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