Austausch und Spinresonanz in den Gadolinium-Pniktiden GdP, GdAs und GdSb

Neukomm, H. R.; Hauger, R.

doi:10.1007/bf01352593

Cited by 5 publications

(1 citation statement)

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“…This behavior is in good agreements with the previous results of the electron paramagnetic resonance (EPR) for GdAs. [13][14][15] The increase of ΔH with approaching T N was generally explained by so-called "critical slowing tus consists of a vector network analyzer and a resonantal cavity, which enables us to clearly detect the signal for relatively high conductivity compounds. Li et al have succeeded in growing a high-quality GdAs single crystal.…”

Section: Resultsmentioning

confidence: 99%

Antiferromagnetic Resonance and Magnetic Structure of GdAs

et al. 2000

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Electron spin resonance measurements on single-crystal and powder of GdAs have been performed in the temperature from 4.2 to 40 K and in the frequency range from 55 to 585 GHz to obtain microscopic information about the magnetic structure. The results obtained indicate that GdAs is an "easy-plane" antiferromagnet with the magnetic moment lying in the (111) plane below Néel temperature (∼20 K). According to an analysis of mean field approximation, the exchange field and the out-of-plane anisotropy field have been estimated to be μ 0 H E = 8.1 T and μ 0 H A = 1.4 T, respectively. The transition field (H c = 2H E + H A ) from the antiferromagnetic to the forced ferromagnetic state is 17.6 T.KEYWORDS: electron spin resonance, antiferromagnetic resonance, low carrier system, GdAs, spin structure range §1. IntroductionRare earth monopnictides RX (R = rare earth, X = N, P, As, Sb and Bi) with NaCl-type crystal structure show interesting behaviors from the electronic and magnetic point of view. They show anomalous physical properties such as the dense Kondo behavior, the metal-insulator transitions, valence fluctuational behavior, heavy fermion state, complicated magnetic states and so on. 1-4) It is known that these compounds are typical strongly correlated systems with low carrier density. The Fermi energy of the low carrier systems is very small compared to usual metallic substances. This causes the competition between the various interactions such as exchange interaction, Kondo effect, electric crystalline field, c-f mixing effect and so on, leading to the anomalous properties. 3,4) In this sense, the study of GdX compounds are particularly of importance because they are the "exchange only" system and very simple system. Since Gd in all these compounds is trivalent and in an S state with spin 7/2, the crystalline-electric field effects is expected to be fairly weak and the indirect exchange interaction is the main mechanism of the magnetic properties. The anisotropic exchange and the multipole interactions are negligibly small. Since the 4f level in GdX is sufficiently below the Fermi level, furthermore, the d-f or p-f mixing can also be negligible. 5) Therefore, GdX are good reference compounds for the study of RX systems.The GdN compound is a semiconductor, whereas the other pnictides are semimetals. 5, 6) The magnetic properties of GdX have been studied by a number research groups. 1-9) However, these data are inconsistent, and GdX shows a strong sample dependence of the magnetic properties. The t results of the magnetic erties of prop recen

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Section: Resultsmentioning

confidence: 99%