Electron spin resonance of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Gd</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></m

Pagliuso, P. G.; Rettori, C.; Sarrao, J. L.; Cornelius, Andrew; Hundley, M. F.; Fisk, Z.; Oseroff, S. B.

doi:10.1103/physrevb.60.13515

Cited by 17 publications

(10 citation statements)

References 32 publications

(20 reference statements)

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“…These are reasonable assumptions because when “ dynamic ” effects are present the g -values are usually strongly T -dependent and when the bottleneck effect is relevant the Korringa rate b decreases with an increasing concentration of the magnetic ions21. Concerning the case of multiple band effects, one would expect the calculated g-shift to be much smaller than the measured one222324. As an example, we consider the pure EuFe 2 As 2 compound in the simplest scenario for the treatment of exchange interaction between Eu 2+ spins and conduction electron spins, i.e., b = ( π .…”

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confidence: 95%

Site specific spin dynamics in BaFe2As2: tuning the ground state by orbital differentiation

Rosa

Adriano

Garitezi

et al. 2014

Sci Rep

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The role of orbital differentiation on the emergence of superconductivity in the Fe-based superconductors remains an open question to the scientific community. In this investigation, we employ a suitable microscopic spin probe technique, namely Electron Spin Resonance (ESR), to investigate this issue on selected chemically substituted BaFe2As2 single crystals. As the spin-density wave (SDW) phase is suppressed, we observe a clear increase of the Fe 3d bands anisotropy along with their localization at the FeAs plane. Such an increase of the planar orbital content is interestingly independent of the chemical substitution responsible for suppressing the SDW phase. As a consequence, the magnetic fluctuations in combination with this particular symmetry of the Fe 3d bands are propitious ingredients for the emergence of superconductivity in this class of materials.

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confidence: 95%

Site specific spin dynamics in BaFe2As2: tuning the ground state by orbital differentiation

Rosa

Adriano

Garitezi

et al. 2014

Sci Rep

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“…In the same temperature range, the negative ∆g ≈ -0.013 (2) indicates that the magnetic ions are interacting mainly with a small density of p-type conduction electron bands. [10][11][12].…”

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confidence: 99%

Electron Spin resonance of Gd³⁺in three dimensional topological insulator Bi₂Se₃

Garitezi

Lesseux

Jesus

et al. 2015

J. Phys.: Conf. Ser.

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Abstract. Bi2Se3 has been claimed to be a three dimensional topological insulator (TI) with topologically protected metallic surface states with exotic properties. We have performed electron spin resonance (ESR) measurements on Gd 3+ doped (x ≈ 0.01) Bi2Se3 single crystal grown from stoichiometric melt. For the studied crystals, our preliminary results revealed a partly resolved Gd 3+ fine structure spectrum with Dysonian (metallic character) lines. At room temperature, the central line has a g ≈ 1.98, a linewidth ∆H ≈ 95 G and the spectra have a overall splitting of roughly 1300 Oe. As the temperature is decreased, the Gd 3+ ESR ∆H of the central line presents a very small Korringa-like behavior b = ∆H/∆T ≈ 0.013 Oe/K and nearly T -independent g-value. However, for T 40 K, ∆H shows a stronger narrowing effect evolving to Korringa-like behavior (b ≈ 0.15 Oe/K) for T 30 K. Concomitantly with the change in ∆H behavior, the Gd 3+ central line g value starts to decrease reaching a value of 1.976 at T = 4.2 K. The ESR results are discussed in terms of possible effects of protected topological surface states enlightened by complementary data from macroscopic measurements. IntroductionTopological insulators are a type of condensed matter materials where a bulk insulator is coated by topologically protected metallic surface states which are robust to disorder [1]. These surface states have exotic properties which are claimed to be of interest to spintronics development. Usually, surface sensitive spectroscopic techniques such as ARPES (angle resolved photoemission spectroscopy) and STM (scanning tunneling microscopy) are used to probe this type of materials. However, to our knowledge, these materials were not studied by Electron Spin Resonance (ESR), which is a spectroscopic technique that can yield local information about the conduction electrons. Also, it is suggested that a periodic perturbation can affect the band topology [2,3], such as microwave radiation in the ESR experiment. In this work, we have performed ESR measurements on Gd 3+ doped Bi 2 Se 3 single crystals. Our results indicate a non-trivial evolution of Gd 3+ spectra at low-T (below 40 K) that we attempt to correlate to the presence the topological metallic surface states. Furthermore, our Gd 3+ ESR data suggest that the studied samples show coexistence of both insulator and metallic behavior inside the microwave skin depth.

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“…That value is, in fact, very close to the one measured, b Ϸ 3.8͑4͒ Oe/ K. Therefore, we can conclude that the approximations made in Eqs. ͑1͒ and ͑2͒ are valid for this compound, and conduction electron-electron correlations, 15,16 q-dependent of the exchange interaction, J fs ͑q͒, 9 and multiple band effects 17 do not need to be taken into account in the analysis of our ESR data.…”

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Crystal structure and physical properties of Gd3Co4Sn13 intermetallic antiferromagnet

Pires

Mendonça-Ferreira

Duque

et al. 2006

Journal of Applied Physics

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We have synthesized single crystalline samples of Gd3Co4Sn13 intermetallic compound using a Sn-flux method. This compound crystallizes with a cubic Yb3Co4Sn13-type structure, space group Pm-3n, which has 40 atoms per unit cell. Measurements of the magnetic susceptibility, heat capacity, electrical resistivity, and electron spin resonance (ESR) revealed that Gd3Co4Sn13 is a metallic Curie-Weiss paramagnet at high temperature and presents an antiferromagnetic ordering below TN=14.5K. In the paramagnetic state, a single Gd3+ ESR line with a nearly temperature independent g∼2.005(2) is observed, and its linewidth follows a Korringa-like behavior as a function of temperature. From the Korringa rate (ΔH∕ΔT∼4Oe∕K) and g-shift (Δg∼0.012) obtained from the ESR experiments combined with the magnetic susceptibility and specific heat data for Gd3Co4Sn13, we have extracted the exchange parameters between the Gd3+ local moments and the conduction-electrons (c-e) in this compound. This exchange parameter Jfs≈10meV was found to be c-e wave-vector independent and the electronic structure of Gd3Co4Sn13 has a single band character.

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Electron spin resonance ofGd3+andNd3+

Cited by 17 publications

References 32 publications

Site specific spin dynamics in BaFe2As2: tuning the ground state by orbital differentiation

Site specific spin dynamics in BaFe2As2: tuning the ground state by orbital differentiation

Electron Spin resonance of Gd³⁺in three dimensional topological insulator Bi₂Se₃

Crystal structure and physical properties of Gd3Co4Sn13 intermetallic antiferromagnet

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Electron spin resonance ofGd3+andNd3+

Cited by 17 publications

References 32 publications

Site specific spin dynamics in BaFe2As2: tuning the ground state by orbital differentiation

Site specific spin dynamics in BaFe2As2: tuning the ground state by orbital differentiation

Electron Spin resonance of Gd3+in three dimensional topological insulator Bi2Se3

Crystal structure and physical properties of Gd3Co4Sn13 intermetallic antiferromagnet

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Electron Spin resonance of Gd³⁺in three dimensional topological insulator Bi₂Se₃