A 121Sb and 151Eu Mössbauer Spectroscopic Investigation of EuCd2X2 (X = P, As, Sb) and YbCd2Sb2

Schellenberg, Inga; Pfannenschmidt, Ulrike; Eul, Matthias; Schwickert, Christian; Pöttgen, Rainer

doi:10.1002/zaac.201100179

Cited by 57 publications

(67 citation statements)

References 41 publications

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“…In the fits only a moderate quadrupole splitting of around À0.29 to 0.24 mm/s occurs. The 121 Sb isomer shift compares very well with the ones determined for other intermetallic antimony compounds such as RET 2 Sb 2 (RE ¼ Eu, Yb; T ¼ Zn, Mn, Pd) [21,22] or YbTSb (T ¼ Ni, Pd, Pt, Cu, Ag, Au) [18]. Moreover, it queues to those given in an overview of different antimony compounds by Lippens [49].…”

Section: Magnetic Propertiessupporting

confidence: 55%

“…EuPdSb [9] and EuPtSb [8] adopt the TiNiSi type structure with puckered T 3 Sb 3 hexagons (orthorhombically distorted variant of ZrBeSi). In the course of our systematic Mössbauer spectroscopic studies of intermetallic compounds [18][19][20][21][22][23] we were interested in the series of EuTSb animonides since the valence state and magnetic ordering phenomena can be studied through the 121 Sb and 151 Eu nuclei simultaneously. So far, 151 Eu data have only been reported for the 18 K antiferromagnet EuPdSb [16].…”

Section: Introductionmentioning

confidence: 99%

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Structure and properties of EuTSb (T= Cu, Pd, Ag, Pt, Au) and YbIrSb

Mishra

Schellenberg

Eul

et al. 2011

Zeitschrift für Kristallographie

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Europium / Ytterbium / Antimonides / Magnetic properties / Mössbauer spectroscopy / Single crystal structure analysis / X-ray diffraction Abstract. The equiatomic antimonides EuTSb (T ¼ Cu, Pd, Ag, Pt, Au) and YbIrSb were synthesized from the elements in sealed tantalum tubes in an induction furnace. The samples were investigated by powder X-ray diffraction and the structures were refined on the basis of single crystal X-ray diffractometer data:166 F 2 values, 8 variables for EuAgSb, a ¼ 467.1(2), c ¼ 848.8(3) pm, wR2 ¼ 0.042, 162 F 2 values, 8 variables for EuAuSb, and TiNiSi type, space group Pnma, a ¼ 762.5(3), b ¼ 469.1(1), c ¼ 792.1(1) pm, wR2 ¼ 0.046, 670 F 2 values, 20 variables for EuPdSb, and a ¼ 700.7(1), b ¼ 444.68(8), c ¼ 781.3(1) pm, wR2 ¼ 0.075, 592 F 2 values, 20 variables for YbIrSb. The structures are ordered superstructure variants of the aristotype AlB 2 with planar T 3 Sb 3 hexagons in EuTSb (T ¼ Cu, Ag, Au) and puckered T 3 Sb 3 hexagons in EuTSb (T ¼ Pd, Pt) and YbIrSb. TiNiSi type EuPtSb was characterized via powder data: a ¼ 759.8(3), b ¼ 465.4(3), c ¼ 791.4(3) pm. Temperature dependent magnetic susceptibility measurements indicate antiferromagnetic ordering for all compounds. The samples were additionally characterized by 121 Sb and 151 Eu Möss-bauer spectra.

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Section: Magnetic Propertiessupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Structure and properties of EuTSb (T= Cu, Pd, Ag, Pt, Au) and YbIrSb

Mishra

Schellenberg

Eul

et al. 2011

Zeitschrift für Kristallographie

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“…EuZn 2 Sb 2 : T N = 12.0 К θ ESR = 1.9 К, (DC measurement: T N = 13.3 К, θ cw = 6.65 -8.8 К weakly anisotropic antiferromagnetic state [4]). Similarly, the positive Curie-Weiss temperatures for antiferromagnets have been observed for other compounds of europium with the same structure [7,8]. But in work [9] in EuRh 2 P 2 with T N = 50 K it was observed θ cw = -45 K. In contrast to other case, in EuRh 2 P 2 the ESR signal above 50 K is not practically observed.…”

Section: Intensity Of the Esr Linesupporting

confidence: 52%

Spin and Valence Fluctuation in Eu Compounds with CaAl₂Si₂-Structure

Goryunov

Nateprov

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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We measured the X-band electron spin resonance (ESR) in the family of ternary Eu pnictides with structure CaAl 2 Si 2type (sp.gr. P3¯m1). Temperature dependences of position and width of resonance line well described by the contribution of the form (T- ) -1/2 ( >0) and  = T N or  =  c-w ; T N ,  c-w -Neel and the Curie-Weiss temperatures). In the case  c-w > T N , experiment obviously indicates the existence of a magnetic phase between the AFM and PM states and relevant quantum critical point. Exchange interaction between localized magnetic moments and the current carriers causes the broadening of the ESR line ΔδH 0 and the gfactor shift Δg K (electronic Knight shift) of Eu 2+ ions relatively free electron. It is known that linewidth of the ESR due the Dzyaloshinsky-Moriya interaction depends on the correlation length  as (/a 0 ) (a 0 -lattice constant), while the symmetric anisotropic interaction as (/a 0 ) 3 . This allows to conclude that experimental results are explained by the dominant contribution of valence and spin fluctuations caused by mentioned symmetrical anisotropic interaction.

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“…In contrast to a peak occurring in the χ ( T ) curves for H along the c ‐axis (Figure 1e), the χ ( T ) curve remains flat below T N when H is parallel to the ab ‐plane. This indicates that the ordered moments are along the c ‐axis 23,24,28–30. On the other hand, a recent resonant elastic X‐ray scattering (REXS) study suggests the same A‐type antiferromagnetic structure, but with in‐plane ( ab ‐plane) magnetic moments 22…”

Section: The Number Of Occupied Bands With Even and Odd Parity At Thementioning

confidence: 99%

“…So far, two different A-type AFM orders have been suggested for the magnetic ground state of EuCd 2 As 2 , [22][23][24] i.e., one with spin along the in-plane direction [22] and one with spin along the out-of-plane direction. [23,24] Using density functional theory (DFT) calculations, we show that the DSM state can exist when the ground state of EuCd 2 As 2 is in the out-ofplane spin configuration. In agreement with previous theoretical studies, [14] the Dirac crossing points are protected by the C3 rotation symmetry around the z-axis.…”

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confidence: 99%

Emergence of Nontrivial Low‐Energy Dirac Fermions in Antiferromagnetic EuCd₂As₂

Wang

Nie

et al. 2020

Advanced Materials

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Parity‐time symmetry plays an essential role for the formation of Dirac states in Dirac semimetals. So far, all of the experimentally identified topologically nontrivial Dirac semimetals (DSMs) possess both parity and time reversal symmetry. The realization of magnetic topological DSMs remains a major issue in topological material research. Here, combining angle‐resolved photoemission spectroscopy with density functional theory calculations, it is ascertained that band inversion induces a topologically nontrivial ground state in EuCd2As2. As a result, ideal magnetic Dirac fermions with simplest double cone structure near the Fermi level emerge in the antiferromagnetic (AFM) phase. The magnetic order breaks time reversal symmetry, but preserves inversion symmetry. The double degeneracy of the Dirac bands is protected by a combination of inversion, time‐reversal, and an additional translation operation. Moreover, the calculations show that a deviation of the magnetic moments from the c‐axis leads to the breaking of C3 rotation symmetry, and thus, a small bandgap opens at the Dirac point in the bulk. In this case, the system hosts a novel state containing three different types of topological insulator: axion insulator, AFM topological crystalline insulator (TCI), and higher order topological insulator. The results provide an enlarged platform for the quest of topological Dirac fermions in a magnetic system.

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A ¹²¹Sb and ¹⁵¹Eu Mössbauer Spectroscopic Investigation of EuCd₂X₂ (X = P, As, Sb) and YbCd₂Sb₂

Cited by 57 publications

References 41 publications

Structure and properties of EuTSb (T= Cu, Pd, Ag, Pt, Au) and YbIrSb

Structure and properties of EuTSb (T= Cu, Pd, Ag, Pt, Au) and YbIrSb

Spin and Valence Fluctuation in Eu Compounds with CaAl₂Si₂-Structure

Emergence of Nontrivial Low‐Energy Dirac Fermions in Antiferromagnetic EuCd₂As₂

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A 121Sb and 151Eu Mössbauer Spectroscopic Investigation of EuCd2X2 (X = P, As, Sb) and YbCd2Sb2

Cited by 57 publications

References 41 publications

Structure and properties of EuTSb (T= Cu, Pd, Ag, Pt, Au) and YbIrSb

Structure and properties of EuTSb (T= Cu, Pd, Ag, Pt, Au) and YbIrSb

Spin and Valence Fluctuation in Eu Compounds with CaAl2Si2-Structure

Emergence of Nontrivial Low‐Energy Dirac Fermions in Antiferromagnetic EuCd2As2

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A ¹²¹Sb and ¹⁵¹Eu Mössbauer Spectroscopic Investigation of EuCd₂X₂ (X = P, As, Sb) and YbCd₂Sb₂

Spin and Valence Fluctuation in Eu Compounds with CaAl₂Si₂-Structure

Emergence of Nontrivial Low‐Energy Dirac Fermions in Antiferromagnetic EuCd₂As₂