Nature of magnetic phase transitions in TbCu2X2 (X = Si, Ge) and HoCu2Si2 compounds

被引：11

作者：

Baran, S. ^{[1
]}

Balanda, M. ^{[2
]}

Gondek, L. ^{[3
]}

Hoser, A. ^{[4
]}

Nenkov, K. ^{[5
,6
]}

Penc, B. ^{[1
]}

Szytula, A. ^{[1
]}

机构：

[1] Jagiellonian Univ, M Smoluchowski Inst Phys, PL-30059 Krakow, Poland

[2] Polish Acad Sci, H Niewodniczariski Inst Nucl Phys, PL-31342 Krakow, Poland

[3] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, PL-30059 Krakow, Poland

[4] Helmholtz Zentrum Berlin, D-14109 Berlin, Germany

[5] Leibnitz Inst Solid State & Mat Res, D-01171 Dresden, Germany

[6] Int Lab High Magnet Fields & Low Temp, PL-53529 Wroclaw, Poland

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 507卷 / 01期

关键词：

Rare earth intermetallics; Antiferromagnetism; Phase transition; Neutron diffraction; NEUTRON; HOCU2GE2; TM;

D O I：

10.1016/j.jallcom.2010.07.167

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Physical properties of TbCu2X2 (X =Si, Ge) and HoCu2Si2, crystallizing with the tetragonal ThCr2Si2-type crystal structure, were investigated by means of neutron diffraction as well as by magnetic and calorimetric measurements. All compounds exhibit antiferromagnetic ordering below T-N equal to 12 K for TbCu2Si2, 13K for TbCu2Ge2 and 6.4K for HoCu2Si2. Neutron diffraction data indicate collinear antiferromagnetic structure described by the propagation vector (k) over right arrow = [(1/2), 0, (1/2)] at low temperatures. While increasing temperature the direction of the Tb magnetic moment changes from [1 1 0] to 101 0] at T-t = 8.5K for TbCu2Si2 and 9.7 K for TbCu2Ge2. In HoCu2Si2 a change of the magnetic structure from the collinear to a modulated one described by the propagation vector k = [k(x), 0, k(z)] was found at T-t = 4.7K. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：16 / 20

页数：5

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