Nuclear Magnetic Resonance Studies of Beryllium-Based Laves Phase XBe<sub>2</sub>

Saji, H.; Yamadaya, T.; Asanuma, M.

doi:10.1143/jpsj.21.255

Cited by 36 publications

(7 citation statements)

References 6 publications

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“…At 272 and 77 K the Knight shifts were #=(0.09 ±0.01)% and -(0.49 ±0.005)% in good agreement with the results of Saji et al 1 and slightly differing from the values estimated from the more recent measurements of Takayi et al 10 At 1.3 K we found that the Knight shift increases with the magnetic field ( Fig. 1, inset) as does x -M/H.…”

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confidence: 90%

Ti NMR Study of the Nearly Ferromagnetic System TiBe2

Alloul

Mihály

1982

Phys. Rev. Lett.

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NMR data on TiBe 2 have been taken from 1.3 to 270 K in magnetic fields up to 60 kG. The linear dependence of the Knight shift and the NMR linewidth with x = M/H show that the increase of x versus applied field at low temperatures is due to a homogeneous property of the electron gas. The ^-electron contribution to the spin-lattice relaxation rate is found to scale linearly with \T in a wide temperature range spanning the spin-fluctuation temperature.PACS numbers: 76.60. Cq, 75.20.En, 76.60.Es The properties of the intermetallic compound TiBe 2 have attracted considerable interest in recent years. This cubic C-15 type material has a strongly enhanced, temperature-dependent susceptibility 1 ' 2 and at low temperatures the x~M/H susceptibility changes with the magnetic field 3 ' 4 and shows a maximum at about 50 to 60 kG. The large enhancement of the susceptibility without any long-range magnetic ordering at low temperature, together with the specific heat, resistivity, 5 * 6 and ESR data 7 show that the electronic system in TiBe 2 exhibits the properties of an interacting Fermi liquid with a low spin-fluctuation temperature 8 (T sf ~ 20 to 50 K). The consequences of the interactions on a microscopic scale, the behavior of the dynamic susceptibility, and the origin of the field-dependent x are open problems which call for more experimental work. On the other hand, the influence of sample preparation on some macroscopic properties, such as the magnitude of the maximum of M/H 9 is apparent in the early publications. 3 * 4 More systematic investigations as a function of preparation techniques are presently attempted. 6 It is quite important to determine whether the differences in the macroscopic parameters are induced mainly by homogeneous modifications of the electronic structure, by sample inhomogeneities, or by local environment effects around impurities. NMR as a microscopic probe is well suited to clear up this point and to provide information on the dynamical susceptibility through nuclear relaxation measurements.In this Letter we present NMR investigations on the Ti nuclei in a wide range of fields and temperatures. The TiBe 2 sample was prepared by Monod et al. A and before reduction into powder for the NMR measurements it has been heat treated in vacuum at 800 K for 100 h. The resistivity ratio r = p(300 K)/p(4.2 K), the low-field susceptibility x (10 kG), and the susceptibility ratio £ = x(60kG)/x(10kG) were r=36, x(10) = 8.4 x 10 " 3 emu/mole, and/> = 1.18, respectively, after annealing. On the other hand r = 110, x(10) = 9.7xl0" 3 emu/mole, and/? = 1.27 were found on a sample prepared in Los Alamos, which confirms the different results of Refs. 3 and 4 and shows that our sample is adequate for investigating any problem linked with sample homogeneity.The NMR spectra were taken with a phase-coherent spectrometer operating at a fixed frequency in the range from 5 to 16 MHz. The magnetic field was calibrated by measuring the NMR signal of 109 Ag in a silver sample 9 located in the same sample holder as the T...

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confidence: 90%

Ti NMR Study of the Nearly Ferromagnetic System TiBe2

Alloul

Mihály

1982

Phys. Rev. Lett.

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“…Since its discovery [1] TiBe2 has posed an intriguing puzzle concerning its magnetic properties. It was called an itinerant antiferromagnet by Matthias [2] on the evidence of a flat susceptibility below about 20 K and a Weiss temperature also about 20 K. However neither neutron scattering [3] nor specific heat [4] could detect a phase change in the system at low temperatures.…”

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High field magnetization of TiBe2 and related compounds

et al. 1980

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Magnetization measurements at 1.8, 4.2 and 9.6 K at fields up to 19 tesla on the intermetallic Laves phase compound TiBe2 reveal a non linear behaviour of the susceptibility : the magnetization increases at first faster than the magnetic field up to 7 T and then curves towards the field axis. By comparison the compounds Ti(Be0.95Cu0.05)2 and Ti(Be0.9Cu0.1)2 display a ferromagnetic character whereas the compound Ti(Be0.99Cu0.01) 2 appears less magnetic than TiBe2, We infer from these facts that TiBe2 is a very strongly exchange enhanced paramagnet and compare it with Pd and YCo2

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“…Unusual high susceptibilities in TiBe2 were first reported by Saji et al [1]. It has recently attracted considerable attention due to the extensive investigation done by Matthias and his collaborators [2,3,4].…”

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confidence: 91%

“…TiBe2 has a strong temperature dependent susceptibility [1] with a shallow maximum at about 10 K [2]. The I/X vs. temperature at low temperatures has a Curie-Weiss behaviour [5] with a slope corresponding to 1.6 Bohr magnetons per formula unit and an intersection with the temperature axis at -20 K [2].…”

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confidence: 99%

Evidence for exchange enhancement of TiBe2 from ESR

1980

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We have observed very strong signals in TiBe2 from 1.4 K up to 300 K at 10 GHz. The signals have the following features : 1) metallic line shape; 2) g = 1.98 ± 0.01 in most of the temperature range; 3) the line width remains almost constant at 50 G up to 10 K, it then increases nearly linearly with temperature up to 150 K at a rate of 3.7 G/K and more slowly at higher temperatures. On the basis of this ensemble of observations we propose that TiBe2 is an enhanced susceptibility metal, like Pd, in agreement with susceptibility, high field magnetization measurements, specific heat, and neutron diffraction results

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Nuclear Magnetic Resonance Studies of Beryllium-Based Laves Phase XBe₂

Cited by 36 publications

References 6 publications

Ti NMR Study of the Nearly Ferromagnetic System TiBe2

Ti NMR Study of the Nearly Ferromagnetic System TiBe2

High field magnetization of TiBe2 and related compounds

Evidence for exchange enhancement of TiBe2 from ESR

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Nuclear Magnetic Resonance Studies of Beryllium-Based Laves Phase XBe2

Cited by 36 publications

References 6 publications

Ti NMR Study of the Nearly Ferromagnetic System TiBe2

Ti NMR Study of the Nearly Ferromagnetic System TiBe2

High field magnetization of TiBe2 and related compounds

Evidence for exchange enhancement of TiBe2 from ESR

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Nuclear Magnetic Resonance Studies of Beryllium-Based Laves Phase XBe₂