Evidence for cluster glass behavior in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mtext>VAl</mml:mtext></mml:mrow></mml:math>Heusler alloys

Vasundhara, М.; Srinivas, V.; Rao, Vishal Govind

doi:10.1103/physrevb.78.064401

Cited by 44 publications

(39 citation statements)

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“…7 Therefore, we expect, the actual Al composition, ␦, is slightly smaller than the nominal one. Figure 1͑b͒ shows the ␦ dependence of lattice constant, a, estimated in this work with those reported in previous works 18,20 …”

Section: Resultssupporting

confidence: 70%

“…7 Remarkably, lattice constant of Fe 2 VAl reflects sensitively these structural deviations from the Heusler structure. 18 Plausibly, Curie temperature, T C , is a function of not only carrier number but also the variation of lattice constant, ⌬a / a. To distinguish those effects on the ferromagnetic transition in Fe 2 VAl 0.95 , it is expected that resistivity measurement under high pressure provides crucial information.…”

Section: E Pressure Effects On Resistivitymentioning

confidence: 99%

“…In the case of stoichiometric Fe 2 VAl the negative temperature coefficient in the electrical resistivity observed up to 1300 K and the constant value of the Hall coefficient at low temperatures 6,7,12 suggest it is a low carrier-density semimetal with a pseudogap at the Fermi level. 6 Antisite defects and magnetic nanoclusters induced by heat treatment and nominal off-stoichiometry bring about ferromagnetism 7,10,13,18 and superparamagnetism. 18 With increasing x in Fe 2+x V 1−x Al, the excess of Fe atoms occupy the nominal V site and, consequently, Fe 3 Al ͑Fe 2 FeAl͒ clusters are formed ͓notice bulk Fe 3 Al is ferromagnetic with T C = 803 K ͑Refs.…”

Section: Introductionmentioning

confidence: 99%

“…6 Antisite defects and magnetic nanoclusters induced by heat treatment and nominal off-stoichiometry bring about ferromagnetism 7,10,13,18 and superparamagnetism. 18 With increasing x in Fe 2+x V 1−x Al, the excess of Fe atoms occupy the nominal V site and, consequently, Fe 3 Al ͑Fe 2 FeAl͒ clusters are formed ͓notice bulk Fe 3 Al is ferromagnetic with T C = 803 K ͑Refs. 6 and 13͔͒.…”

Section: Introductionmentioning

confidence: 99%

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Weak itinerant ferromagnetism in Heusler-typeFe2VAl0.95

et al. 2010

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Weak itinerant ferromagnetism in Sato, K.; Naka, T.; Taguchi, M.; Nakane, T.; Ishikawa, F.; Yamada, Y.; Takaesu, Y.; Nakama, T.; de Visser, A.; Matsushita, A. Published in:Physical Review B DOI:10.1103/PhysRevB.82.104408 Link to publicationCitation for published version (APA): Sato, K., Naka, T., Taguchi, M., Nakane, T., Ishikawa, F., Yamada, Y., ... Matsushita, A. (2010 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We report measurements of the magnetic, transport, and thermal properties of the Heusler-type compound Fe 2 VAl 0.95 . We show that while stoichiometric Fe 2 VAl is a nonmagnetic semimetal a 5% substitution on the Al site with the 3d elements Fe and V atoms leads to a ferromagnetic ground state with a Curie temperature T C =33Ϯ 3 K and a small ordered moment s = 0.12 B / Fe in Fe 2 VAl 0.95 . The reduced value of the ratio s / p = 0.08, where p = 1.4 B / Fe is the effective Curie-Weiss moment, together with the analysis of the magnetization data M͑H , T͒, show magnetism is of itinerant nature. The specific heat shows an unusual temperature variation at low temperatures with an enhanced Sommerfeld coefficient, ␥ =12 mJ K −2 mol −1 . The resistivity, ͑T͒, is metallic and follows a power law behavior = 0 + AT n with n Ϸ 1.5 below T C . With applying pressure, T C decreases with the rate of ͑1 / T C ͒͑dT C / dP͒ = −0.061 GPa −1 . We conclude substitution on the Al site with Fe and V atoms results in itinerant ferromagnetism with a low carrier density.

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Section: Resultssupporting

confidence: 70%

Section: E Pressure Effects On Resistivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Weak itinerant ferromagnetism in Heusler-typeFe2VAl0.95

et al. 2010

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“…[12] showed that the annealed Fe 2 VAl sample show an increase in magnetization and resistivity due to less crystal defects after annealing. which might be due to sample dependent anti-site defects.…”

Section: Resistance Versus Magnetic Fieldmentioning

confidence: 99%

Magnetization and magneto-transport studies on Fe2VAl1−xSix

Amaladass

Satya

Sharma

et al. 2015

Journal of Alloys and Compounds

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Ni_1‐xCr_x alloy for self controlled magnetic hyperthermia

Akin

Kim

Issa

et al. 2009

Cryst. Res. Technol.

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It is known now that an increase in tumor temperature decreases the tumor resistance to chemo-and radiation therapies. Hyperthermia treatment of the tumor cells where damage to the healthy cells can be avoided is viable by using magnetic nanoparticles with controlled Curie temperatures. Nickel-Chromium (Ni 1-x Cr x ) particles with varying compositions have been investigated as thermoseeds for use in localized self controlled hyperthermia treatment of cancer. A series of Ni 1-x Cr x alloys, have been prepared to find the specific composition which has Curie temperature around 316-317 K. The samples were cast by arc melting technique, and were annealed at 850 o C for 5 hours in sealed quartz tubes. Magnetic properties of the samples were investigated, including Curie temperature, saturation magnetization and hysterisis using Superconducting Quantum Interference Device (SQUID) and Vibrating Sample Magnetometer (VSM). The Curie temperatures of the alloys were found to decrease almost linearly from 401 K to 289 K as the Cr concentration was increased from x = 4.54 wt % to x = 5.90 wt %. The results showed that Ni 1-x Cr x alloys might be good candidates for self regulating magnetic hyperthermia applications.

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Evidence for cluster glass behavior inFe2VAlHeusler alloys

Cited by 44 publications

References 43 publications

Weak itinerant ferromagnetism in Heusler-typeFe2VAl0.95

Weak itinerant ferromagnetism in Heusler-typeFe2VAl0.95

Magnetization and magneto-transport studies on Fe2VAl1−xSix

Ni_1‐xCr_x alloy for self controlled magnetic hyperthermia

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Evidence for cluster glass behavior inFe2VAlHeusler alloys

Cited by 44 publications

References 43 publications

Weak itinerant ferromagnetism in Heusler-typeFe2VAl0.95

Weak itinerant ferromagnetism in Heusler-typeFe2VAl0.95

Magnetization and magneto-transport studies on Fe2VAl1−xSix

Ni1‐xCrx alloy for self controlled magnetic hyperthermia

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Ni_1‐xCr_x alloy for self controlled magnetic hyperthermia