Magnetism and transport properties of HfFe₆Ge₆-type Er_1−xGd _xMn₆Ge₆ (x=0.2−0.9) compounds

Abstract

Magnetic transitions and magnetotransport properties of polycrystalline Er_1−xGd _xMn₆Ge₆ (x=0.2−0.9) compounds were studied. The magnetic and resistivity properties were analyzed in an applied magnetic field up to 5 T. It is found that Er_1−xGd _xMn₆Ge₆ (x=0.2−0.9) compounds displays a transition from the antiferromagnetic state to the ferrimagnetic state for increasing Gd content. The Er_1−xGd _xMn₆Ge₆ with x=0.2 and 0.5 compounds order antiferromagnetically at 430 and 432 K, respectively. The Er_1−x Gd _xMn₆Ge₆ with x=0.8 and 0.9 compounds order ferrimagnetically at 462 and 471 K, respectively. The Er_1−xGd _xMn₆Ge₆ compounds undergo the second transitions below 71 K. The magnetoresistance curves of the Er_0.1Gd_0.9Mn₆Ge₆ compound in a field of 5 T are presented and the magnetoresistance effects are related to the metamagnetic transitions.

Keywords

HfFe₆Ge₆ / magnetism / magnetoresistance effect

References

[1] Baibich M. N., Broto J. M., Fert A., . Giant Magnetoresistance of (001)Fe/(001)Cr Magnetic Superlattices[J]. Phys. Rev. Lett., 1988, 61(21): 2 472-2 475.

[2] van Dover R. B., Gyorgy E. M., Cava R. J., . Magnetoresistance of SmMn₂Ge₂: A Layered Antiferromagnet[J]. Phys. Rev. B, 1993, 47(10): 6 134-6 137.

[3] Kunkel H. P., Zhou X. Z., Stampe P. A., . Giant Magnetoresistive Behavior Near the Metamagnetic Transition in Ce(Fe_0.93Ru_0.07)₂[J]. Phys. Rev. B, 1996, 53(22): 15 099-15 105.

[4] Zhang S. Y., Zhao T. Y., Shen B. G., . Multiple Magnetic Transitions and Large Magnetoresistance of the Y_0.5Ho_0.5Mn₆Sn₆ Compound[J]. Appl. Phys. Lett., 2002, 81(20): 3 825-3 827.

[5] Yao J. L., Zhang S. Y., Yan M., . Magnetism and Giant Magnetoresistance of HeFe₆Ge₆-type Y_0.7Ce_0.3Mn₆Sn₆ Compound[J]. J. Appl. Phys., 2003, 93(12): 10 137-10 139.

[6] Venturini G., Idrissi B. C. E., Ressouche E., . Magnetic Structure of TbMn₆Ge₆ from Neutron Diffraction Study[J]. J. Alloys and Compdounds, 1994, 216: 243-250.

[7] Schobinger-Papamantellos Andre G., Rodriguez-Carvajal J., . Skewed Spiral Magnetic Structure in ErMn₆Ge₆[J]. J. Alloys and Compdounds, 1995, 219(1–2): 176-180.

[8] Brabers J. H. V. J., Dujin V. H. M., de Boer F. R., . Magnetic Properties of Rare-earth Manganese Compounds of the RMn₆Ge₆ Type[J]. J. Alloys and Compounds, 1993, 198(1–2): 127-132.

[9] Zhang L. G., Wang R. W., Li L., . Magnetic Properties and Magnetoresistance of HfFe₆Ge₆-type Dy_1−xGd_xMn₆Ge₆ (x=0.1 −0.6) Compounds[J]. Chin. Phys., 2003, 12(5): 562-565.

[10] Zhang S. Y., Zhao P., Li R. W., . Structure, Magnetic Properties and Giant Magnetoresistance of YMn₆Sn_6−xGa_x (x =0−0.6) Compounds[J]. Chin. Phys., 2001, 10(4): 345-348.

[11] Kim W. S., Chi E. O., Choi H. S., . Temperature-Independent Magnetoresistance of the Layered Manganite Sr_1.6Pr_1.4Mn₂O₇[J]. J. Korean Phys. Soc., 2001, 38(1): 29-32.

[12] Levy P. M., Zhang S. A Fert. Electrical Conductivity of Magnetic Multilayered Structures[J]. Phys. Rev. Lett., 1990, 65(13): 1 643-1 646.