Mössbauer and magnetic susceptibility investigations of strontium, lanthanum and europium transition metal phosphides with ThCr2Si2 type structure

Mörsen, E.; Mosel, Bernd D.; Müller‐Warmuth, W.; Reehuis, M.; Jeitschko, Wolfgang

doi:10.1016/0022-3697(88)90030-3

Cited by 117 publications

(75 citation statements)

References 27 publications

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“…LaFe 2 P 2 is a Pauli-paramagnetic metal with trivalent nonmagnetic rare-earth La atoms [15] showing no signs of any magnetic or superconducting order down to 20 mK. The electronic structure, though anisotropic, is rather three dimensional and characterized by a strongly corrugated quasi-two-dimensional electron Fermi-surface sheet, as well as a donut-shaped, and a strongly branched Fermi surface.…”

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confidence: 99%

Fermi-surface topology of the iron pnictideLaFe2P2

et al. 2014

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We report on a comprehensive de Haas-van Alphen (dHvA) study of the iron pnictide LaFe 2 P 2 . Our extensive density-functional band-structure calculations can well explain the measured angular-dependent dHvA frequencies. As salient feature, we observe only one quasi-two-dimensional Fermi-surface sheet; i.e., a hole-like Fermi-surface cylinder around , essential for s ± pairing, is missing. In spite of considerable mass enhancements due to many-body effects, LaFe 2 P 2 shows no superconductivity. This is likely caused by the absence of any nesting between electron and hole bands.

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confidence: 99%

Fermi-surface topology of the iron pnictideLaFe2P2

et al. 2014

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“…Clear identification of the origin of DOS at E F is essential for understanding the superconducting properties because Cooper pairs in the BCS theory can be generated by electrons which have energies close to the Fermi 054507-4 level. In our calculations, the total DOS at the Fermi level (N(E F )) for BaNi 2 P 2 is calculated to be 3.64 states/eV, a value slightly lower than a previous GGA value of 3.82 states/eV [23]. Calculations of partial DOS suggest that the total N(E F ) is contributed roughly by 12% from Ba electronic states, 47% from Ni electronic, and 41% P electronic states.…”

Section: A Structural and Electronic Propertiesmentioning

confidence: 83%

“…The main reasons for this large number are its high capability to adjust to strongly different atomic sizes as well as a broad range of electron counts. Thus, the intermetallic AM 2 X 2 (A = rare earth metal, alkaline earth or alkali element, M = transition metals, X = B, P, Si, As, Ge) have been studied for a long time because of their exotic properties, such as heavy fermion behavior, superconductivity, curious magnetic order, and quantum criticality [2][3][4][5][6][7][8][9][10][11][12]. In particular, superconductivity is found for ruthenium phosphide LaRu 2 P 2 with the low transition temperature (T c ) of 4.0 K [13], while the compounds Ba(K)Fe 2 As 2 exhibit the high transition temperature (T c ) of 38 K [14].…”

Section: Introductionmentioning

confidence: 99%

Electron-phonon superconductivity in the ternary phosphidesBaM2P2(M=Ni,Rh,a

et al. 2016

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Ab initio plane-wave pseudopotential calculations of electronic and vibrational properties have been carried out for the ternary phosphides BaM 2 P 2 (M = Ni, Rh and Ir) with a ThCr 2 Si 2 -type structure. The calculated electronic results show the metallic character of BaM 2 P 2 , and the plots of total and partial density of states of BaM 2 P 2 exhibit strong hybridization between the d states of the M atom and the p states of the P atom below the Fermi energy. Differences in the phonon spectrum and density of states both in the acoustical and optical ranges for these compounds are presented and discussed. The Eliashberg spectral function for these compounds has been calculated by using a linear response approach based on the density functional theory. By integrating the Eliashberg spectral function, the average electron-phonon coupling parameter (λ) is determined to be 0.61 for BaNi 2 P 2 , 0.55 for BaIr 2 P 2 , and 0.43 for BaRh 2 P 2 . Using the calculated values of λ and the logarithmically averaged phonon frequency ω ln the superconducting critical temperature (T c ) values for BaNi 2 P 2 , BaIr 2 P 2 , and BaRh 2 P 2 are obtained to be 2.80, 1.97, and 0.70 K, respectively, which compare very well with their experimental values of 3.0, 2.1, and 1.0 K.

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“…The SrCo 2 P 2 with the ucT cell is an enhanced Pauli paramagnetic metal without any magnetic orderings [8]. In the ucT region (x ≤ 0.5) in which the electronic structure is expected to be quasi-2D, the Weiss temperature changes from negative value to 0 K with increasing x, suggesting that Sr 1−x Ca x Co 2 P 2 approaches to a ferromagnetic quantum critical point (QCP).…”

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confidence: 99%

Anomalous itinerant-electron metamagnetic transition in the layeredSr1−xCaxCo2P2system

et al. 2014

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We report magnetic properties of the layered itinerant system, Sr 1−x Ca x Co 2 P 2 in the magnetic field up to 70 T. As for the exchange-enhanced Pauli paramagnetic metal SrCo 2 P 2 , the magnetization curve shows two characteristic anomalies. The low-field anomaly is small without obvious hysteresis, and the high-field one is a typical behavior of the itinerant-electron metamagnetic transition (IEMT). Such a successive transition in the magnetization curve cannot be explained by the conventional phenomenological theory for IEMT due to the Landau expansion of the free energy, but by the extended Landau expansion theory with distinguishable two energy states. In the systematical study of Sr 1−x Ca x Co 2 P 2 , furthermore, the metamagnetic transition field decreases and goes to zero as x increases up to 0.5, indicating that the ferromagnetic quantum critical point (QCP) exists at x ∼ 0.5.

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Mössbauer and magnetic susceptibility investigations of strontium, lanthanum and europium transition metal phosphides with ThCr2Si2 type structure

Cited by 117 publications

References 27 publications

Fermi-surface topology of the iron pnictideLaFe2P2

Fermi-surface topology of the iron pnictideLaFe2P2

Electron-phonon superconductivity in the ternary phosphidesBaM2P2(M=Ni,Rh,a

Anomalous itinerant-electron metamagnetic transition in the layeredSr1−xCaxCo2P2system

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