P. Javorský
Charles University in Prague
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Featured researches published by P. Javorský.
Journal of Alloys and Compounds | 1998
P. Javorský; L. Havela; V. Sechovský; H. Michor; K Jurek
Abstract We studied structural and magnetic properties of the RCuAl (R=rare earth) intermetallic compounds by means of X-ray diffraction, susceptibility, magnetization and specific heat measurements. Magnetic ordering at low temperatures was observed in most of these materials. Results provide indications of ferromagnetic coupling in the heavy rare-earth compounds (R=Gd–Er), while PrCuAl and NdCuAl show antiferromagnetic behaviour. Additional magnetic phase transition in the ordered state was found in GdCuAl and DyCuAl. A metamagnetic transition was observed in DyCuAl.
Journal of Magnetism and Magnetic Materials | 1997
P. Javorský; P. Burlet; V. Sechovský; A.V. Andreev; J. Brown; P. Svoboda
Abstract A single crystal of TbNiAl has been studied by neutron diffraction and magnetization measurements. Terbium magnetic moments are aligned along the c -axis over the whole temperature range below T N = 44.6 K. A change of the propagation and magnitude of one-third of the moments occurs at T 1 = 23.5 K. Below T 1 , moments at ( x,0, 1 2 ) and ( x , x , 1 2 ) propagate with k = ( 1 2 ,0, 1 2 ), while moments at ( 0,x, 1 2 ) propagate with k′ = (0, 1 2 , 1 2 ) or k′ = (− 1 2 , 1 2 , 1 2 ) . All moments have the same magnitude. Between T 1 and T N , all moments propagate with the same propagation vector k , but moments at ( 0,x, 1 2 ) are significantly reduced. A metamagnetic transition occurs in a field of 0.4 T applied along the c -axis.
Physica B-condensed Matter | 1996
P. Javorský; P. Burlet; E. Ressouche; V. Sechovský; H. Michor; G. Lapertot
Abstract Polycrystalline samples of ErCuAl and ErNiAl have been studied by powder neutron diffraction and, in the case of ErCuAl, by specific heat and AC-susceptibility measurements. ErCuAl orders ferromagnetically with Er magnetic moments aligned along the c-axis below Tc = 6.8 K. In the case of ErNiAl, magnetic ordering below TN = 5.4 K and indications of an additional phase transition at 4.2 K have been observed. The magnetic structure of ErNiAl is described by the propagation vector ( 1 2 , 0, 1 2 ). The magnetic moments lie in the basal plane at 1.8 K.
Journal of Magnetism and Magnetic Materials | 1996
P. Javorský; P. Burlet; E. Ressouche; V. Sechovský; G. Lapertot
Abstract Polycrystalline sample of HoNiAl has been studied by powder neutron diffraction. The existence of two magnetic phases with transition temperatures T c = 13 K and T l = 5 K has been confirmed. The magnetic structure of both phases contains ferro- and antiferromagnetic components of the magnetic moments. The antiferromagnetic component with the propagation vector ( 1 2 , 0, 1 2 ) is parallel to the c -axis for T > T 1 and lie in the basal plane for T T 1 . At any temperature the ferromagnetic component is along the c -axis.
Journal of Alloys and Compounds | 1999
A.V Andreev; P. Javorský; A. Lindbaum
We have studied the magnetic anisotropy and the spontaneous magnetostriction of the hexagonal RCuAl (R=Gd, Dy and Ho) compounds by means of X-ray diffraction. A uniaxial magnetic anisotropy in DyCuAl and GdCuAl and a basal-plane type of magnetic anisotropy in HoCuAl have been found. The temperature development of lattice parameters revealed a considerable linear spontaneous magnetostriction both in the basal plane and along the c-axis. The mutual cancellation of these linear effects of opposite sign yields a tiny volume spontaneous magnetostriction.
Physica B-condensed Matter | 1997
P. Javorský; P. Burlet; V. Sechovský; R.R. Arons; E. Ressouche; G. Lapertot
Abstract We studied magnetic ordering in RNiAl (R Pr, Nd, Tb, Dy, Ho and Er) compounds by neutron diffraction. All observed magnetic structures have a common propagation vector k = (0.5, 0, q) commensurate (q = 0.5) for heavy rare earths (R Tb, Dy, Ho and Er) and incommensurate in PrNiAl (q = 0.41) and NdNiAl (q = 0.46) with q temperature invariable down to 1.8 K. The antiferromagnetic (AF) ground-state phases have the rare-earth magnetic moments lying in the basal plane for R Pr, Nd, Er and oriented along the c-axis in TbNiAl. The canted structures in DyNiAl and HoNiAl are combinations of the AF coupled basal-plane components and the c-axis ferromagnetic ones. The latter three materials (R Tb, Dy, Ho) exhibit a magnetic phase transition in the ordered state connected with quite a complex moment re-arrangement.
Journal of Magnetism and Magnetic Materials | 1995
P. Javorský; N. C. Tuan; M. Diviš; L. Havela; P. Svoboda; V. Sechovský; G. Hilscher
Abstract Results of structure, susceptibility and specific heat studies of RCuAl and RNiAl compounds are presented. Most of the compounds with a partially filled f-shell exhibit magnetic ordering at low temperatures. The ordering temperatures and paramagnetic Curie temperatures are roughly proportional to de Gennes factor.
Physica B-condensed Matter | 1997
L. Havela; A.V. Andreev; V. Sechovský; I.K Kozlovskaya; K. Prokes; P. Javorský; M.I. Bartashevich; T. Goto; K. Kamishima
UCoAl is a 5f-band metamagnet characterized by a very low critical field Bc ≈ 0.8 T, which induces magnetization of 0.3 μB/f.u. by a distinct transition. Bc increases with increasing temperature with the rate consistent with the reduced γ-coefficient in the high-field state. Bc-values are also sensitive to stoichiometry and external pressure.
Journal of Physics: Condensed Matter | 2012
P. Čermák; M. Kratochvílová; K Pajskr; P. Javorský
We have grown and characterized single crystals of R(2)RhIn(8) (R=Tb, Dy, Ho, Er and Tm) compounds crystallizing in the tetragonal Ho(2)CoGa(8)-type crystal structure. Their magnetic properties were studied by specific heat and magnetization measurements. All the investigated compounds order antiferromagnetically with Néel temperatures of 43.6, 25.1, 10.9, 3.8 and 4.1 K, respectively. Magnetic phase diagrams were constructed.
Journal of Physics: Condensed Matter | 2008
E. Colineau; J. P. Sanchez; F. Wastin; P. Javorský; E Riffaud; Yoshiya Homma; P Boulet; J. Rebizant
NpRhGe is the neptunium homologue of the ferromagnetic superconductor URhGe, and has been investigated using magnetization, electrical resistivity, specific heat and 237Np Mossbauer spectroscopy. NpRhGe exhibits antiferromagnetic ordering below TN≈21 K with an ordered magnetic moment μNp = 1.14 μB. The value of the isomer shift suggests a Np3+ charge state (configuration 5f4) and possible delocalization of the 5f electrons. The Brillouin-like (J = 1/2) thermal variation of the magnetic hyperfine field indicates that a doublet ground state of the neptunium ion may occur in this compound. The specific heat indicates a high Sommerfeld coefficient value for NpRhGe (195 mJ mol−1 K−2).