Magnetic structure of Gd5Si2Ge2 and Gd5Si2Ge1.9M0.1 (M = Ga, Cu)

被引:4
作者
Palacios, E. [1 ]
Rodriguez-Velamazan, J. A. [1 ,2 ]
Wang, G. F. [1 ]
Burriel, R. [1 ]
Cuello, G. [2 ]
Rodriguez-Carvajal, J. [2 ]
机构
[1] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
[2] Inst Laue Langevin, F-38000 Grenoble, France
关键词
NEUTRON-DIFFRACTION; TRANSITION; GD-5(SIXGE1-X)(4); REFRIGERATION; GD-5(SI2GE2); ALLOYS; GE;
D O I
10.1088/0953-8984/22/44/446003
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Powder x-ray diffraction patterns of the doped compounds Gd5Si2Ge1.9M0.1 (M = Ga, Cu) show the same crystal structure, orthorhombic Gd5Si4-type, in the ferromagnetic and paramagnetic phases. This is different from Gd5Si2Ge2, whose paramagnetic phase is monoclinic. The magnetic structure at low temperature, solved from diffraction experiments with hot neutrons, is the same in all the three compounds, collinear ferromagnetic with moments along the crystal b-axis, or FyFBy according to Bertaut's notation. These results, combined with those of heat capacity and magnetocaloric effect, indicate, similarly to Gd5Si4, a second-order, purely magnetic, transition in the doped compounds explaining the absence of hysteresis.
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页数:6
相关论文
共 30 条
[1]   POLARIZED NEUTRON STUDY OF THE INTERMETALLIC COMPOUND GDAL2 [J].
ABELL, JS ;
BOUCHERLE, JX ;
OSBORN, R ;
RAINFORD, BD ;
SCHWEIZER, J .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1983, 31-4 (FEB) :247-248
[2]   The influence of gallium on the magnetocaloric properties of Gd5Si2Ge2 [J].
Aksoy, Seda ;
Yucel, Atila ;
Elerman, Yalcin ;
Krenke, Thorsten ;
Acet, Mehmet ;
Moya, Xavier ;
Manosa, Lluis .
JOURNAL OF ALLOYS AND COMPOUNDS, 2008, 460 (1-2) :94-98
[3]  
[Anonymous], 1997, CRC Handbook of Chemistry and Physics
[4]   MAGNETIC-PROPERTIES AND MAGNETIC-STRUCTURE OF GDNI2SI2 AND GDCU2SI2 COMPOUNDS [J].
BARANDIARAN, JM ;
GIGNOUX, D ;
SCHMITT, D ;
GOMEZSAL, JC ;
FERNANDEZ, JR ;
CHIEUX, P ;
SCHWEIZER, J .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1988, 73 (02) :233-239
[5]  
BERTAUT EF, 1963, SPIN CONFIGURATIOS I, V3, P149
[6]   Magnetic structure of GdCu through the martensitic structural transformation: A neutron-diffraction study [J].
Blanco, JA ;
Espeso, JI ;
Soldevilla, JG ;
Sal, JCG ;
Ibarra, MR ;
Marquina, C ;
Fischer, HE .
PHYSICAL REVIEW B, 1999, 59 (01) :512-518
[7]   A review on Mn based materials for magnetic refrigeration:: Structure and properties [J].
Bruck, E. ;
Tegus, O. ;
Thanh, D. T. Cam ;
Trung, Nguyen T. ;
Buschow, K. H. J. .
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 2008, 31 (05) :763-770
[8]   Making and breaking covalent bonds across the magnetic transition in the giant magnetocaloric material Gd5(Si2Ge2) [J].
Choe, W ;
Pecharsky, VK ;
Pecharsky, AO ;
Gschneidner, KA ;
Young, VG ;
Miller, GJ .
PHYSICAL REVIEW LETTERS, 2000, 84 (20) :4617-4620
[9]   Nanoscale zippers in Gd5(SixGe1-x)4:: Symmetry and chemical influences on the nanoscale zipping action [J].
Choe, W ;
Pecharsky, AO ;
Worle, M ;
Miller, GJ .
INORGANIC CHEMISTRY, 2003, 42 (25) :8223-8229
[10]   D4c: A very high precision diffractometer for disordered materials [J].
Fischer, HE ;
Cuello, GJ ;
Palleau, P ;
Feltin, D ;
Barnes, AC ;
Badyal, YS ;
Simonson, JM .
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2002, 74 (Suppl 1) :S160-S162