Výsledky vyhledávání - "F. A. B. Chaves"

The influence of B variation on the electronic properties of Al3Ni20B (6≤x≤12)

Autor: M. ElMassalami, A. Elzubair, F. A. B. Chaves, R. E. Rapp, M. Elhadi, Hiroyuki Takeya

Publikováno v: Journal of Alloys and Compounds. 499:11-16

We investigated the influence of B variation on the structural, thermal, and electronic properties of the ternary intermetallics Al3Ni20Bx ( x = 6 , 7 , … , 12 ). On increasing the metalloid content, the cubic unit-cell parameter (space group F m 3

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::44bda18f6f7db11f0f1ca9fecb9eedc8
https://doi.org/10.1016/j.jallcom.2010.03.051

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Uma proposta inovadora de ensino de física experimental no início do Século XX

Autor: Júlio Carlos Afonso, F. A. B. Chaves

Publikováno v: Revista Brasileira de Ensino de Física v.37 n.1 2015
Revista Brasileira de Ensino de Física
Sociedade Brasileira de Física (SBF)
instacron:SBF
Revista Brasileira de Ensino de Física, Vol 37, Iss 1, p 1601
Revista Brasileira de Ensino de Física, Volume: 37, Issue: 1, Article number: 1601, Published: 12 MAR 2015

Este trabalho analisa os três volumes da obra Problemas Práticos de Physica Elementar, de Heitor Lyra da Silva, editada entre 1916 e 1929, destinada a alunos dos então cursos regulares (primário e secundário) e profissional. Rompendo com os padr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::531999af83a8628481796f2e3e564093
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1806-11172015000101601

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Do termoscópio ao termômetro digital: quatro séculos de termometria

Autor: Denise Prazeres Lopes Pires, Júlio Carlos Afonso, F. A. B. Chaves

Publikováno v: Química Nova, Vol 29, Iss 6, Pp 1393-1400 (2006)
Química Nova v.29 n.6 2006
Química Nova
Sociedade Brasileira de Química (SBQ)
instacron:SBQ

This work describes the evolution of temperature measurement in the last four centuries using thermometers based on the thermal expansion of liquids such as ethyl alcohol and mercury. The concept of temperature was strongly dependent on the researche

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06cbbf20d5c6f2c9f7744f37771d21f4
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422006000600041&lng=en&tlng=en

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Anomalous low-temperature behavior of PrT2B2C and

Autor: Hiroyuki Takeya, M. El Massalami, R. E. Rapp, H.A Borges, F. A. B. Chaves

Publikováno v: Journal of Magnetism and Magnetic Materials. 279:5-13

We investigated the magnetic, thermal and resistive properties of PrT 2 B 2 C ( T = Co , Ni ) and their solid solutions Pr 1− x Dy x T 2 B 2 C. These compounds behave as normal metallic paramagnets at higher temperatures. At lower temperatures, the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ea693474ae3e361ed45665e2375b4536
https://doi.org/10.1016/j.jmmm.2003.12.1325

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Spin-wave contribution to specific heat of superconducting antiferromagnets RNi2B2C (R=Er, Dy)

Autor: F. A. B. Chaves, J. Flores, C. M. Chaves, Hiroyuki Takeya, M. El Massalami, R. E. Rapp

Publikováno v: Physica C: Superconductivity. 354:178-182

RNi 2 B 2 C (R=Tm, Er, Ho, Dy) superconducts at, respectively, T c =11, 11, 8, 6 K. Below, respectively, T N ≃1.5, 6, 5, 10.6 K, each (For D Y below T c ) shows a coexistence of superconductivity and antiferromagnetism. Since their magnetic structu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cc22b6e4d6fb9f96a354f0205f1c3991
https://doi.org/10.1016/s0921-4534(01)00043-0

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Characterization ofRCo2B2C(R=rare earth,Y):Phase stability, nonsuperconductivity, and breakdown of the de Gennes scaling

Autor: M.S. da Costa, F. A. B. Chaves, R. E. Rapp, M. El Massalami

Publikováno v: Physical Review B. 62:8942-8949

We investigated the phase stability, crystal structure, magnetism, specific heat, and resistivity of $R{\mathrm{Co}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ $(R=\mathrm{La},$ Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Y, Er). $R{\mathrm{Co}}_{2}{\mathrm{B}}_{2}\mathrm{C

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::230c6822e7c94ebe2c37042d72c8e8a9
https://doi.org/10.1103/physrevb.62.8942

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Lockin transition, irreversibility field, and Josephson vortex penetration depth in κ-(ET)2Cu[N(CN)2]Br

Autor: S. Rao, F. A. B. Chaves, N. H. Tea, John A. Schlueter, Hau H. Wang, Russell W Giannetta, Urs Geiser, J. C. Garland, M. B. Salamon, Aravinda M. Kini, M. W. Trawick

Publikováno v: Physica C: Superconductivity. 321:207-218

Penetration depth measurements in κ-(ET) 2 Cu[N(CN) 2 ]Br are reported for fields H up to 1 T in magnitude and arbitrary orientation. For H nearly parallel to the conducting planes, the vortex penetration depth is nonmonotonic with field, indicating

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::00b5a0436f84b14b579257259d35cc41
https://doi.org/10.1016/s0921-4534(99)00382-2

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Vortex penetration depth of κ-(ET)2Cu[N(CN)2]Br

Autor: F. A. B. Chaves, Russell W Giannetta, M. B. Salamon, Jack M. Williams, Urs Geiser, Hsien-Hau Wang, Ulrich Klostermann, N. H. Tea

Publikováno v: Physica C: Superconductivity. 280:281-288

The magnetic field dependence of the in-plane penetration depth λ |( H ) for single crystal κ-(ET) 2 Cu[N(CN) 2 ]Br has been measured at 3, 9.6, and 36 MHz. Over a limited range, λ | scales with a characteristic field H ∗ (T) that coincides with

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::960f0604575fe08a939beaf02aa02f82
https://doi.org/10.1016/s0921-4534(97)00370-5

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Multilayer adsorption isotherms of para-hydrogen on graphite

Autor: F. A. B. Chaves, L. M. A. Diehl, E. Lerner

Publikováno v: Journal of Low Temperature Physics. 92:173-180

Adsorption isotherms of para-hydrogen adsorbed on graphite foam were measured for the temperature interval of 9 to 15 K up to about 25 layers, using the standard volumetric method. From these isotherms straight lines were obtained for ln(P 0/P) as a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f8c531e9cff9287712ee8a502e9a34cd
https://doi.org/10.1007/bf00682334

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Magnon contribution to specific heat of the magnetic superconductor HoNi2B2C

Autor: M. El Massalami, F. A. B. Chaves, R. E. Rapp

Publikováno v: Journal of Magnetism and Magnetic Materials. :476-478

Below 5 K, the quaternary intermetallic borocarbide HoNi 2 B 2 C shows a coexistence of superconductivity and commensurate antiferromagnetism. Since such a magnetic ground structure consists of ferromagnetic HoC layers that are weakly coupled antifer

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aec9868de9f6104ca69bd2b456b47f57
https://doi.org/10.1016/s0304-8853(00)00975-6

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