Neutron diffraction studies of nuclear magnetic ordering in copper

Jyrkkiö, T. A.; Huiku, M. T.; Siemensmeyer, K.; Clausen, K.N.

doi:10.1007/bf00682669

Cited by 27 publications

(20 citation statements)

References 27 publications

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“…Comprehensive neutron-diffraction measurements were then made of the magnetic-field dependence of the scattered-neutron intensity (Jyrkkiö et al, 1989). The data, shown in Fig.…”

Section: Neutron-diffraction Measurements On Coppermentioning

confidence: 99%

“…In cryostats of this type, the first nuclear stage acts as a precooler for the much smaller second stage. Three cascade refrigerators, namely, those at Helsinki (Ehnholm, Ekströ m, Jacquinot et al, 1979;Ehnholm et al, 1980;Huiku et al, 1986), at Risø (Jyrkkiö et al, 1989), and at the Hahn-Meitner-Institut in Berlin (Tuariniemi, Nummila, et al, 1995), were employed in the experiments to be described in detail in this review. Other machines of the cascade type have been built in Jü lich , Tokyo (Ishimoto et al, 1984), and Bayreuth (Gloos et al, 1988); in these cryostats the aim is usually to cool conduction electrons or 3 He.…”

Section: Experimental Techniques For Susceptibility Measurementsmentioning

confidence: 99%

“…Ratio of the spin-lattice relaxation times measured in high and low fields, rϭ 1 (B high )/ 1 (B low ), for samples of copper, silver, and rhodium with different residual resistivity ratios (RRR). Data are from Huiku, Loponen et al (1984) and from Jyrkkiö et al (1989) for Cu, from and Oja, Annila, and Takano (1991) for Ag, and from Hakonen, Vuorinen, and Martikainen (1994) for Rh.…”

Section: Thermal Contactmentioning

confidence: 99%

“…The neutron-diffraction experiments on copper (Jyrkkiö et al, 1989;Annila et al, 1992) were carried out in the guide hall adjacent to the DR-3 reactor at the Risø National Laboratory in Denmark. From a cold source, a beam of long-wavelength neutrons was transmitted via a curved guide to the TAS-8 double-axis diffractometer, constructed at the Hahn-Meitner Institute in Berlin.…”

Section: A Setup For Neutron-diffraction Experimentsmentioning

confidence: 99%

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Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

1997

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This paper is a comprehensive review of almost twenty years of research on nuclear magnetic ordering, first in copper and later in silver and rhodium metals. The basic principles of nuclear magnetism and the measurement of positive and negative spin temperatures are discussed first. Cascade nuclear refrigeration techniques, susceptibility and nuclear-magnetic-resonance (NMR) measurements, and arrangements for neutron-diffraction experiments at nanokelvin and picokelvin temperatures are described next. Comprehensive magnetic-susceptibility and neutron-diffraction measurements on copper, which led to the discovery of at least three antiferromagnetic phases, one displaying the novel (0 2 3 2 3 ) spin structure and the other two showing the type-I order of the fcc system, are then described in detail. NMR data on silver, at TϾ0 and TϽ0, are presented next leading to the observation that silver orders antiferromagnetically at positive spin temperatures and ferromagnetically at negative spin temperatures. The authors discuss recent neutron-diffraction measurements that show that the antiferromagnetic structure at TϾ0 is in a single-k type-I state. NMR data on rhodium at TϾ0 and TϽ0 are also described. Results obtained on Tl, Sc, AuIn 2 , and metallic Pr compounds and on insulators like CaF 2 are then discussed briefly. The paper is concluded by an extensive theoretical section. Calculations of conduction-electron mediated exchange interactions are described, and the mean-field theory of nuclear magnetic ordering is presented. The role of thermal and quantum fluctuations is then discussed, particularly in the selection of the antiferromagnetic ground state. Finally, theoretically calculated magnetic phase diagrams and ordered spin structures of copper and silver are presented in detail and compared with experimental results. The overall agreement is good, affirming the value of nuclear magnets in Cu and Ag as realizations of simple physical models. [S0034-6861(97)00301-2] ogy,

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“…Comprehensive neutron-diffraction measurements were then made of the magnetic-field dependence of the scattered-neutron intensity (Jyrkkiö et al, 1989). The data, shown in Fig.…”

Section: Neutron-diffraction Measurements On Coppermentioning

confidence: 99%

Section: Experimental Techniques For Susceptibility Measurementsmentioning

confidence: 99%

Section: Thermal Contactmentioning

confidence: 99%

Section: A Setup For Neutron-diffraction Experimentsmentioning

confidence: 99%

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Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

1997

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“…Mais cette limite pratique est loin de constituer l'horizon ultime des mesures de neutrons aux ultra-basses températures, pour autant qu'on soit prêt à y investir le temps et les efforts nécessaires. Parmi les expériences "pionnières" dans ce domaine, on citera la série d'études sur l'ordre nucléaire dans les métaux nobles réalisée par une équipe de l'Université d'Helsinki en liaison avec des neutroniciens du HMI Berlin et du Laboratoire National de Risø (Danemark) [18,40]. Dans le cas de l'argent, la température d'ordre nucléaire est inférieure au nanokelvin.…”

Section: Ultra-basses Températures : Exemples D'applicationsunclassified

Diffusion neutronique sous conditions extrêmes

Mignot

2008

Études Structurales Par Diffraction Des Neutrons

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Résumé. Depuis quelques années, on assiste dans tous les centres de neutrons à un regain d'intérêt pour les expériences réalisées sous "conditions extrêmes". En partant des techniques classiques de basses températures, forts champs et hautes pressions adaptées à la diffusion neutronique, ce cours passe en revue les développements en cours ou à venir, depuis les échantillons microscopiques étudiés dans les cellules à enclumes en diamant jusqu'aux puissantes installations devant produire des champs magnétiques bien supérieurs à la limite actuelle des 15 teslas.

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Neutron Scattering of Magnetic Materials

Isnard

2009

Nanoscale Magnetic Materials and Applications

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Neutron diffraction studies of nuclear magnetic ordering in copper

Cited by 27 publications

References 27 publications

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

Diffusion neutronique sous conditions extrêmes

Neutron Scattering of Magnetic Materials

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