[Zurück]


Zeitschriftenartikel:

N. Baranov, T. Goto, G. Hilscher, P.E. Markin, H. Michor, N. Mushnikov, J.-G. Park, A. A. Yermakov:
"Irreversible field-induced magnetic phase transitions and properties of Ho3Co";
Journal of Physics: Condensed Matter, 17 (2005), S. 3445 - 3462.



Kurzfassung englisch:
N V Baranov et al 2005 J. Phys.: Condens. Matter 17 3445-3462

Irreversible field-induced magnetic phase transitions and properties of Ho3Co
N V Baranov 1,2, T Goto 3, G Hilscher 4, P E Markin 1,2, H Michor 4, N V Mushnikov 1, J-G Park 5 and A A Yermakov 1,2

1 Institute of Metal Physics, Russian Academy of Science, 620219 Ekaterinburg, Russia
2 Institute of Physics and Applied Mathematics, Ural State University, 620083 Ekaterinburg, Russia
3 Institute for Solid State Physics, University of Tokyo, Kashiva-shi, Chiba-ken 277-8581, Japan
4 Institut für Festkörperphysik, TU Wien, A1040 Wien, Austria
5 Department of Physics and Institute of Basic Science, SungKyunKwan University, Suwon 404-746, Korea

Received 7 March 2005, in final form 12 April 2005
Published 13 May 2005
Print publication: Issue 21 (1 June 2005)

Abstract. The results of magnetic susceptibility, magnetization, electrical resistivity and specific heat measurements performed on Ho3Co single crystals show that this compound exhibits two different antiferromagnetic structures: AFΠ at 8 K<T< 22 K and AFΠ below T8 ~ K. Below the Néel temperature TN = 22 K the application of a magnetic field along the main crystallographic directions induces magnetic phase transitions which are accompanied by giant magnetoresistance. At T<Tt the field-induced phase transitions along the c- and b-axes are found to be irreversible, and a small ferromagnetic component is observed along the a-axis. These peculiarities are associated with the non-Kramers character of the Ho ion and with the presence of a complex incommensurate magnetic structure of Ho3Co below TN. The temperature coefficient of the electrical resistivity for Ho3Co above TN over a wide temperature range is found to differ from that observed for other R3Co compounds. Such a behaviour is attributed to the presence of an additional contribution to the conduction electron scattering by spin fluctuations induced by f-d exchange in the itinerant d-electron subsystem. The value of this extra contribution and its temperature range is suggested to depend on the spin value of the R ion. The excess of the effective magnetic moment per R ion, which is observed in Ho3Co and in other R3M type compounds, is also attributed to spin fluctuations induced by f-d exchange.

doi:10.1088/0953-8984/17/21/034
URL: http://stacks.iop.org/0953-8984/17/3445
PII: S0953-8984(05)95796-2


Online-Bibliotheks-Katalog der TU Wien:
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05937925

Elektronische Version der Publikation:
http://stacks.iop.org/0953-8984/17/3445


Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.