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RESEARCH PRODUCT
Collective Modes and Structural Modulation in Ni-Mn-Ga(Co) Martensite Thin Films Probed by Femtosecond Spectroscopy and Scanning Tunneling Microscopy.
Moritz MerkleinC. RummelMartin GroßmannThomas DekorsyHanjo SchaeferHanjo SchaeferOliver RistowYuan LuoMartin SchubertJan MayerJure DemsarJure DemsarJure DemsarMikhail FoninAleksej LaptevVitaly GusevVitaly GusevChuan HeKonrad SamwerMike Hettichsubject
[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph]PhysicsCondensed matter physicsDopingGeneral Physics and AstronomyNanotechnology02 engineering and technology021001 nanoscience & nanotechnology01 natural scienceslaw.inventionCondensed Matter::Materials ScienceMagnetic shape-memory alloylawMartensiteLattice (order)0103 physical sciencesModulation (music)ddc:530Scanning tunneling microscopeThin film010306 general physics0210 nano-technologyFemtochemistrydescription
International audience; 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-08-01 | Physical review letters |