Magnetic resonance studies of some antiferromagnetic Gd-monopnictides and Gd-monochalcogenides

Sugawara, Kazuo; Huang, Chao‐Yuan; Hùber, D. L.

doi:10.1007/bf00655425

Cited by 17 publications

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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

show abstract

Section: Resultsmentioning

confidence: 99%

Antiferromagnetic Resonance and Magnetic Structure of GdAs

et al. 2000

View full text Add to dashboard Cite

show abstract

Physical properties and phase transitions of the rare earth monosulphides in the homogeneity range

Vasil’ev¹,

Грабов²,

Golubkov³

et al. 1983

Phys. Stat. Sol. (a)

View full text Add to dashboard Cite

The heat capacity (C), lattice constant (a), density (d), and electrical conductivity (σ) of RE monosulphides LnSx (Ln = La, Pr, Nd, and Gd) are studied in the homogeneity range (up to x = 0.80). A vacuum adiabatic calorimeter is used to measure C between 2 and 300 K. A systematic analysis of the experimental densities and those calculated from X‐ray data reveals the vacancies in the sulphur sublattice for x < 1. The Schottky heat capacity, the crystal field parameters, and the energy levels of the Pr3+ and Nd3+ ions are found to be nearly the same for any x. Four sharp peaks for NdS at 8.4, 9.3, 9.7, and 11.5 K and three anomalies for GdS at 5.4, 27, and 60 K are observed. The smoothed experimental C data are tabulated. The standard entropy and enthalpy values are calculated.

show abstract

LaN - TbSb

Grünberg¹,

Maletta²

Landolt-Börnstein - Group III Condensed Matter

View full text Add to dashboard Cite

Magnetic resonance studies of some antiferromagnetic Gd-monopnictides and Gd-monochalcogenides

Cited by 17 publications

References 13 publications

Antiferromagnetic Resonance and Magnetic Structure of GdAs

Antiferromagnetic Resonance and Magnetic Structure of GdAs

Physical properties and phase transitions of the rare earth monosulphides in the homogeneity range

LaN - TbSb

Contact Info

Product

Resources

About