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

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

doi:10.1103/PhysRevLett.115.076402

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

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

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11 Citations (Scopus)

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.

Original language	English
Article number	076402
Journal	Physical Review Letters
Volume	115
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.115.076402
Publication status	Published - 13 Aug 2015
Externally published	Yes

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10.1103/PhysRevLett.115.076402

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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), Article 076402. https://doi.org/10.1103/PhysRevLett.115.076402

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

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.",

author = "M. Schubert and H. Schaefer and J. Mayer and A. Laptev and M. Hettich and M. Merklein and C. He and C. Rummel and O. Ristow and M. Gro{\ss}mann and Y. Luo and V. Gusev and K. Samwer and M. Fonin and T. Dekorsy and J. Demsar",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

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doi = "10.1103/PhysRevLett.115.076402",

language = "English",

volume = "115",

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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, vol. 115, no. 7, 076402. https://doi.org/10.1103/PhysRevLett.115.076402

TY - JOUR

T1 - Collective Modes and Structural Modulation in Ni-Mn-Ga(Co) Martensite Thin Films Probed by Femtosecond Spectroscopy and Scanning Tunneling Microscopy

AU - Schubert, M.

AU - Schaefer, H.

AU - Mayer, J.

AU - Laptev, A.

AU - Hettich, M.

AU - Merklein, M.

AU - He, C.

AU - Rummel, C.

AU - Ristow, O.

AU - Großmann, M.

AU - Luo, Y.

AU - Gusev, V.

AU - Samwer, K.

AU - Fonin, M.

AU - Dekorsy, T.

AU - Demsar, J.

PY - 2015/8/13

Y1 - 2015/8/13

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84939633096&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.115.076402

DO - 10.1103/PhysRevLett.115.076402

M3 - Article

AN - SCOPUS:84939633096

SN - 0031-9007

VL - 115

JO - Physical Review Letters

JF - Physical Review Letters

IS - 7

M1 - 076402

ER -

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

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