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VOLUME 82 | ISSUE 1 | PAGE 36
Magnetic phase transitions in TbNi5 single crystal: bulk properties and neutron diffraction studies
S. Lee+, A. A. Podlesnyak*, K. Prokes^{\triangle}, V. E. Sikolenko^{\triangle}, A. S. Ermolenko^{\square}, E. G. Gerasimov^{\square}, Yu. A. Dorofeev^{\square}, A. P. Vokhmyanin^{\square}, J.-G. Park^{+\nabla}, A. N. Pirogov^{+\square}
+Department of Physics and Institute of Basic Science, SungKyunKwan University, Suwon 440-746, South Korea *Laboratory for Neutron Scattering, ETH Zurich & Paul Scherrer Institute, Villigen 5232 PSI, Switzerland ^{\triangle}BENSC, Hahn-Meitner Institute, Berlin D-14109, Germany ^{\square}Institute of Metal Physics of RAS, 620219 Ekaterinburg, Russia ^{\nabla}Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-742, South Korea

PACS: 75.25.+z, 75.30.Kz, 61.12.-q
Abstract
The magnetic susceptibility, heat capacity and neutron diffraction measurements have been carried out in order to study the unusual magnetic ordering of TbNi5 using a single crystal over the temperature region of 2\sim30 K. Two spontaneous magnetic transitions have been observed: one is a second order transition from a paramagnetic state to an incommensurate structure (Tp =24 K) and the other a first order transition from the incommensurate structure to a lock-in phase (Tcf = 10 K). We also found an irreversible magnetic field-induced transition from the modulated structure to the ferromagnetic collinear one.


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