Magnetic phase diagram of Al-doped spinel MnV2O4

Huang, Zijun; Luo, X.; Lin, Shuai; Huang, Yisen; Hu, Ling; Zhang, L.; Sun, Yipeng

doi:10.1016/j.ssc.2013.01.011

Cited by 10 publications

(22 citation statements)

References 23 publications

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“…Thereupon, μ A μ B = 1 and one can use the representation μ B = 1/μ A . Then, μ A and Hartree-Fock parameters are solution of a system of four equations, equations (11) The customary formula for the entropy of a Bose system with Hamiltonian (7) is…”

Section: Methods Of Calculationmentioning

confidence: 99%

See 1 more Smart Citation

Model for the field cooled and zero field cooled ferrimagnetic spinel

Karchev

2015

Journal of Magnetism and Magnetic Materials

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Section: Methods Of Calculationmentioning

confidence: 99%

“…The system of equations for the Hartree-Fock parameters Eqs. (11), in terms of the Bose functions of the α and β excitations, adopt the form…”

Section: Appendix a Spin-fermion Model Of Spinel Ferrimagnetmentioning

confidence: 99%

Model for the field cooled and zero field cooled ferrimagnetic spinel

Karchev

2015

Journal of Magnetism and Magnetic Materials

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“…If the applied field is below 0.01T it is zero field cooled (ZFC). The magnetization-temperature and magnetic susceptibility curves for (ZFC) and (FC) spinel show a remarkable difference below Néel T N temperature [36][37][38][39][40][41][42][43][44][45][46][47][48] . In the case of F eCr 2 S 4 spinel the curves, which show the temperature dependence of spontaneous magnetization M s , are depicted in Fig.…”

mentioning

confidence: 92%

Sequence of superconducting states in field cooled $FeCr_2S_4$

Karchev

2021

Preprint

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In the present article we discuss theoretically the emergence of superconductivity in field cooled F eCr2S4. The chromium electrons form a triplet t2g states and due to antiferromagnetic exchange with the iron spins have Zeeman splitting. Applied, during preparation, magnetic field along the moment of iron ions, successively compensates the Zeeman splittings. The chromium electrons with zero Zeeman energy form Cooper pairs induced by iron magnons. In that way, we predict theoretically the existence of sequence of superconducting states in field cooled F eCr2S4. Actually there are three different superconductors prepared applying, during preparation, different magnetic fields. In these compounds superconductivity coexist with the saturated magnetism of iron ions.

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“…When the magnetic field is below the critical one H < H cr1 the prepared material, with switched off magnetic field, is spin−1/2 antiferromagnetic insulator, while when H > H cr1 the sublattice A electrons are delocalized and the material is metal, with well defined Fermi surfaces and Fermi liquid-type quasiparticles. This method of preparation of ferrimagnetic spinel is very popular [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The magnetizationtemperature and magnetic susceptibility curves for zerofield-cooled (ZFC) and field-cooled (FC) ferrimagnetic spinel display a notable difference below Néel T N temperature.…”

Section: Introductionmentioning

confidence: 99%

Magnon-induced superconductivity in field-cooled spin-1/2 antiferromagnets

Karchev

2017

Phys. Rev. B

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If, during the preparation, an external magnetic field is applied upon cooling we say it has been field cooled. A novel mechanism for insulator-metal transition and superconductivity in field-cooled spin-1/2 antiferromagnets on bcc lattice is discussed. Applying a magnetic field along the sublattice B magnetization, we change the magnetic and transport properties of the material. There is a critical value Hcr1. When the magnetic field is below the critical one H < Hcr1 the prepared material is a spin−1/2 antiferromagnetic insulator. When H > Hcr1 the sublattice A electrons are delocalized and the material is metal. There is a second critical value Hcr2 > Hcr1. When H = Hcr2, it is shown that the Zeeman splitting of the sublattice A electrons is zero and they do not contribute to the magnetization of the system. At this quantum partial order point (QPOP) the sublattice B transversal spin fluctuations (magnons) interact with sublattice A electrons inducing spin anti-parallel p-wave superconductivity which coexists with magnetism. At zero temperature the magnetic moment of sublattice B electrons is maximal. Below the Néel temperature (TN ) the gap is approximately constant with a small increase when the system approaches TN . It abruptly falls down to zero at temperatures above TN .

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Magnetic phase diagram of Al-doped spinel MnV2O4

Cited by 10 publications

References 23 publications

Model for the field cooled and zero field cooled ferrimagnetic spinel

Model for the field cooled and zero field cooled ferrimagnetic spinel

Sequence of superconducting states in field cooled $FeCr_2S_4$

Magnon-induced superconductivity in field-cooled spin-1/2 antiferromagnets

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