Lattice dynamics and external magnetic-field effects in Ni-Fe-Ga alloys

被引：29

作者：

Perez-Landazabal, J. I. ^{[1
]}

Recarte, V. ^{[1
]}

Sanchez-Alarcos, V. ^{[1
]}

Rodriguez-Velamazan, J. A. ^{[2
,3
]}

Jimenez-Ruiz, M. ^{[2
]}

Link, P. ^{[4
]}

Cesari, E. ^{[5
]}

Chumlyakov, Y. I. ^{[6
]}

机构：

[1] Univ Publ Navarra, Dept Fis, Pamplona 31006, Spain

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[3] Univ Zaragoza, CISC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain

[4] Tech Univ Munich, Forsch Neutronenquelle Heinz Maier Leibnitz FRM 2, D-85747 Garching, Germany

[5] Univ Illes Balears, Dept Fis, E-07122 Palma de Mallorca, Spain

[6] Siberian Phys Tech Inst, Tomsk 634050, Russia

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 14期

关键词：

PREMARTENSITIC PHENOMENA; PHASE-TRANSFORMATIONS; TRANSITION; STRAIN;

D O I：

10.1103/PhysRevB.80.144301

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Precursor phenomena were investigated in a Ni-Fe-Ga alloy close to the stoichiometric Heusler composition Ni2FeGa. In particular, the phonon-dispersion curves, the diffuse scattering and the magnetic properties of a single crystalline Ni51.5Fe21.5Ga27 alloy were measured as a function of temperature. The TA(2) branch along the [110] direction of the L2(1) phase shows a significant phonon softening around xi = 0.35 resulting in a marked dip which becomes more pronounced as the temperature decreases. Diffuse neutron-scattering measurements performed along [(xi) over bar xi 0] direction around Bragg reflections also reveal the presence of small satellite peaks at xi = 0.33 whose intensity increases on approaching the martensitic transformation temperature. Both elastic and inelastic-scattering anomalies confirm the occurrence of premartensitic phenomena in Ni-Fe-Ga alloys. The influence of an external magnetic field (6 T) on the anomalous phonon is shown to be negligible and just a small shift of the transformation temperature takes place because of the magnetic field.

引用

页数：6

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