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Dive into the research topics where Farzana Nasreen is active.

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Featured researches published by Farzana Nasreen.


Journal of Physics: Conference Series | 2011

RF skin-depth measurement of UIrGe in high magnetic fields

Farzana Nasreen; Karunakar Kothapalli; M. M. Altarawneh; H. Nakotte; N. Harrison; Ekkehard Brück

UIrGe crystallizes in the orthorhombic TiNiSi structure and it orders antiferromagnetically at low temperatures. Previous magnetoresistance and magnetization studies had revealed multiple metamagnetic transitions between ~ 12 T and ~ 19T. Our present studies show that RF skin depth measurement offers an alternative magnetotransport probe. A proximity detector oscillator (PDO) is used to perform the contactless RF skin-depth measurements of UIrGe in pulsed magnetic fields up to 47 T in temperature range 0.57–12 K. The frequency and amplitude shifts reflect the changes in both the real and imaginary components of the conductivity. Our results confirm that the measured frequency shifts can be related to the magnetoresistance effects.


Journal of Physics: Conference Series | 2011

Magnetic phase transitions in CePtSn under high pressure

A. M. Alsmadi; M. S. Torikachvili; M K Kothapalli; Farzana Nasreen; H. Nakotte

CePtSn crystallizes in the orthorhombic TiNiSi-type structure. The compound undergoes two antiferromagnetic transitions at TN = 7.5 K and TM = 5 K, and it exhibits large magnetic and transport anisotropy. We report on measurements of the electrical resistivity of single-crystalline CePtSn as a function of temperature and magnetic field (i || c axis, H || a axis) performed under hydrostatic pressure up to 20 kbar. At ambient pressure, the overall temperature dependence indicates Kondo-type behavior in the presence of the crystal field. The application of pressure causes a reduction of the magnetoresistance effect. We find that the maximum in Δρ / ρB=0 is only 0.05 at 20 kbar, while it is about 0.15 at ambient pressure. On the other hand, application of hydrostatic pressure in CePtSn has little effect on both TN and TM. It initially increases both temperatures, but then reduces them again above 10 kbar. The results are discussed in terms of moment fluctuations and the variation due to increased 4f -ligand hybridization.


Journal of Physics: Conference Series | 2011

Multiferroic behavior in organo-metallics

Vivien Zapf; F. Wolff-Fabris; M. Kenzelmann; Farzana Nasreen; Fedor Balakirev; Y Chen; A. Paduan-Filho

The study of multiferroic (MF) and magnetoelectric (ME) materials seeks to understand and harness the coupling between electric and magnetic polarizations. To date, research into ME and MF bulk materials has largely focused on inorganic oxides and only a relatively small number of materials have been found with significant ME couplings. We explore organo-metallics where transition metal ions are incorporated into a flexible and designable organic lattice. We present recent results on ME and MF behavior in single crystals of the organo-metallic compounds NiCl2-4SC(NH2)2 and CuCl2-2(CH3)2SO.


Journal of Applied Physics | 2009

Effect of temperature on hybridization and magnetism in UPdSn and UCuSn

Karunakar Kothapalli; Farzana Nasreen; Joe Peterson; H. Nakotte; S. El-Khatib; Sven C. Vogel; Anna Llobet; Helmut M. Reiche; Ian P. Swainson; E. Brück

We measured the temperature dependence of the structural parameters and the occurrence of magnetism in UPdSn and UCuSn using neutron diffraction. The data were taken in an effort to understand the role of hybridization effects for the development of the uranium magnetic moment and the occurrence of long-range magnetic order in these two compounds. The shortest U–U distance provides a measure of delocalization due to direct 5f-5f overlap, while the U–Pd (or U–Cu, respectively) and U–Sn distances give a measure of the effects of 5f-ligand hybridization. Using Rietveld refinement of our neutron diffraction data, we determined the shortest interatomic distances for temperatures between 15 K and room temperature. The changes in the interatomic distances cause changes in the hybridization effects, which in turn leads to the formation of a magnetic ground state for both compounds.


Journal of Applied Physics | 2009

Pressure and magnetic field effects in heavy-fermion UCu3.5Al1.5

Farzana Nasreen; Karunakar Kothapalli; H. Nakotte; A. M. Alsmadi; Vivien Zapf; F. Fabris; A. Lacerda; J. Kamarád

UCu3.5Al1.5 is a heavy-fermion compound, which crystallizes in the hexagonal CaCu5 structure, and it was reported to exhibit non-Fermi-liquid scaling at low temperatures. We report on the measurements of the electrical resistivity and magnetoresistance as a function of temperature (2–150 K), pressure (0–10 kbar), and applied magnetic field (0–18 T). The results provide evidence that, for UCu3.5Al1.5, application of pressure and/or magnetic field tends to suppress non-Fermi-liquid scaling and a tendency toward long-range magnetic correlations is observed for temperatures below 20 K, although there is no clear evidence of long-range order in the available pressure and field range.


Journal of Applied Physics | 2008

Electronic properties of single crystalline UNi0.39Rh0.61Al

S. El-Khatib; A. M. Alsmadi; V. Correa; A.V. Andreev; A. Lacerda; Farzana Nasreen; H. Nakotte

U(Ni,Rh)Al alloys crystallize in the hexagonal ZrNiAl structure. Here, we report on measurements on a single crystalline member of this series, namely, UNi0.39Rh0.61Al. Similar to other members of this series, this compound exhibits highly anisotropic properties with the easy-magnetization direction along the c-axis. We report in the results of electrical resistance, magnetoresistance, and thermal expansion as a function of temperature (2–300K) and applied magnetic field (0–18T). The results provide strong evidence for antiferromagnetic ordering at TN⩽15K followed by a ferromagneticlike (ferro—or ferrimagnetic) transition around 7K (we use the term “ferromagneticlike” because, based on our bulk data, we cannot exclude canted moments with antiferromagnetic components or ferromagnetic order of two different moments). A magnetic B-T phase diagram for UNi0.39Rh0.61Al is proposed.


Physica B-condensed Matter | 2011

Non-Fermi-liquid behavior in UCu4+xAl8−x compounds

Farzana Nasreen; M. S. Torikachvili; Karunakar Kothapalli; Vivien Zapf; R.F. Jardim; H. Nakotte


Journal of the Korean Physical Society | 2013

Specific heat and thermal conductivity of UCu4+xAl8−x compounds

Farzana Nasreen; M. S. Torikachvili; K. Kothapalli; Y. Kohama; Vivien Zapf; H. Nakotte


Bulletin of the American Physical Society | 2013

Pressure-Induced Valance change in Ytterbium Organometallic Molecule Cp*

Farzana Nasreen; Daniel Antonio; Andrew L. Cornelius; Corwin H. Booth; M. S. Torikachvili; Yuming Xiao


Physica B-condensed Matter | 2011

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Farzana Nasreen; M. S. Torikachvili; Karunakar Kothapalli; Vivien Zapf; R. F. Jardim; H. Nakotte

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H. Nakotte

New Mexico State University

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Vivien Zapf

Los Alamos National Laboratory

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A. Lacerda

Los Alamos National Laboratory

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Anna Llobet

Los Alamos National Laboratory

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Arthur J. Schultz

Argonne National Laboratory

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F. Wolff-Fabris

Los Alamos National Laboratory

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Paula M. B. Piccoli

University of Wisconsin-Madison

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