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article

Symmetry‐Mismatch‐Induced Ferromagnetism in the Interfacial Layers of CaRuO₃/SrTiO₃ Superlattices

Wenxiao Shi, Jine Zhang, Xiaobing Chen, Qinghua Zhang, more

Advanced Functional Materials > 33 > 22 > n/a - n/a

By modifying the entangled multi‐degrees of freedom of transition‐metal oxides, interlayer coupling usually produces interfacial phases with unusual functionalities. Herein, a symmetry‐mismatch‐driven interfacial phase transition from paramagnetic to ferromagnetic state is reported. By constructing superlattices using CaRuO₃ and SrTiO₃, two oxides with different oxygen octahedron networks, the tilting/rotation...

article

The Emergence of an Itinerant Ferromagnetic State in Co‐Doped YNi₅: A Critical Behavior Study of the Phase Transition

Suraj K. Karmakar, Saurav Giri, Subham Majumdar

physica status solidi (b) > 257 > 12 > n/a - n/a

YNi₅ is an enhanced Pauli paramagnetic material, and this work is devoted to the effect of Co doping at the Ni site of YNi₅. It is found that at 10% Co doping, the sample turns ferromagnetic, with a weak itinerant character. The critical behaviours of the 10% Co‐doped sample (i.e., YNi_4.5CO_0.5) in its polycrystalline form are examined through bulk magnetization measurements. The second‐order phase...

article

Critical phenomenon in the itinerant ferromagnet Cr11Ge19 studied by scaling of the magnetic entropy change

Hui Han, Lei Zhang, Xiangde Zhu, Haifeng Du, more

Journal of Alloys and Compounds > 2017 > 693 > C > 389-393

Critical phenomenon of the noncentrosymmetric Cr₁₁Ge₁₉, which exhibits an itinerant ferromagnetic ground state, is investigated by scaling of the magnetic entropy change [ΔS_M(T,H)]. It is found that parameters δ_FWHM (the full width at half maximum), −ΔSMmax (the maximum of the magnetic entropy change), and RCP (the relative cooling power) of ΔS_M(T) are governed by the power law of critical exponents...

article

Enhanced ferromagnetism induced by structural phase transitions in Co2As1−xPx

Chih-Wei Chen, Jiakui K. Wang, E. Morosan

Physica B: Condensed Matter > 2016 > 481 > C > 236-243

P doping in Co₂As induces two structural transitions, resulting in an enhanced ferromagnetic state at intermediate P compositions. In Co₂As_1−xP_x, doping induces a room temperature α-to-β structural distortion around x=0.04, similar to what temperature (T=725K) does in the parent compound (x=0). The resulting β phase displays an enhanced ferromagnetic ground state. Close to x=0.85, a hexagonal-to-orthorhombic...

article

Effect of external pressure on the magnetic properties of RCoAsO (R=La, Pr, Sm): a μSR study

G. Prando, S. Sanna, R. Khasanov, A. Pal, more

Journal of Physics and Chemistry of Solids > 2015 > 84 > C > 63-69

We report on a detailed investigation of the itinerant ferromagnets LaCoAsO, PrCoAsO and SmCoAsO performed by means of muon spin spectroscopy upon the application of external hydrostatic pressures p up to 2.4GPa. These materials are shown to be magnetically hard in view of the weak dependence of both critical temperatures T_C and internal fields at the muon site on p. In the cases R=La and Sm, the...

article

Contact Potential Instability in the Path-Integral Description of Itinerant Ferromagnetism

E. Vermeyen, J. Tempere

Journal of Low Temperature Physics > 2015 > 179 > 3-4 > 175-185

It has long been predicted that a two-component non-localized Fermi gas will exhibit spontaneous polarization for sufficiently strong repulsive interactions, a phenomenon which is called itinerant ferromagnetism. Recent experiments with ultracold atomic gases have reached the interaction strength for which theoretical models have predicted the occurrence of the normal-to-itinerant-ferromagnetic phase...

article

Finite range and upper branch effects on itinerant ferromagnetism in repulsive Fermi gases: Bethe–Goldstone ladder resummation approach

Lianyi He

Annals of Physics > 2014 > 351 > C > 477-503

We investigate the ferromagnetic transition in repulsive Fermi gases at zero temperature with upper branch and effective range effects. Based on a general effective Lagrangian that reproduces precisely the two-body s-wave scattering phase shift, we obtain a nonperturbative expression of the energy density as a function of the polarization by using the Bethe–Goldstone ladder resummation. For hard sphere...

article

Dominant itinerant ferromagnetism in Eu0.5Sr0.5CoO3: Evidences from both critical analysis and Rhodes-Wohlfarth’s criterion

Renwen Li, Feng Li, Jun Fang, Wei Tong, more

Journal of Alloys and Compounds > 2013 > 577 > Complete > 303-308

The critical behaviors of ferromagnet Eu _0.5 Sr _0.5 CoO ₃ around T _C =140.5K have been comprehensively investigated by analyzing a series of isothermal magnetization M(H) curves. Both modified Arrott plot and Kouvel–Fisher methods give nearly the same critical exponents, which scale nicely the M(H) curves into two different branches below and above T _C . The...

article

Symmetry argument of cyano-bridged copper-molybdenum complexes

Jun Ohara, Shoji Yamamoto

Journal of the Korean Physical Society > 2013 > 62 > 12 > 1797-1801

Motivated by photoinduced magnetism in the mixed-valent bimetallic compounds with the general formula Cu ₂ ^II [Mo^IV(CN)₈]·xH₂O, we investigate their ground-state properties, in comparison with those of nickel-molybdenum analogs, by employing a group-theoretical technique. These bimetallic assemblies consist of octacyanomolybdenum complexes with a square antiprism configuration and crystallize in...

article

Correlation effect in bcc iron at finite temperatures

Muneyuki Nishishita, Dai Hirashima, Sudhakar Pandey

Journal of the Korean Physical Society > 2013 > 62 > 12 > 2160-2163

Self-consistent second-order perturbation theory is applied to a multi-band Hubbard model to study the static and the dynamical properties of iron at finite temperatures. Reasonable values of the Curie temperature and the Curie constant are obtained for a realistic band structure and realistic values of the local Coulomb interaction. The dynamical transverse susceptibility in the ferromagnetic phase...

article

Repulsive polarons and itinerant ferromagnetism in strongly polarized Fermi gases

P. Massignan, G. M. Bruun

The European Physical Journal D > 2011 > 65 > 1-2 > 83-89

We analyze the properties of a single impurity immersed in a Fermi sea. At positive energy and scattering lengths, we show that the system possesses a well-defined but metastable excitation, the repulsive polaron, and we calculate its energy, quasiparticle residue and effective mass. From a thermodynamic argument we obtain the number of particles in the dressing cloud, illustrating the repulsive character...

article

Superconductivity in Itinerant Ferromagnetic Systems

A. A. Díaz, J. J. Rodríguez-Núñez, A. A. Schmidt, I. Ţifrea

Journal of Superconductivity and Novel Magnetism > 2011 > 24 > 7 > 2091-2098

We studied the possible superconducting state in an electronic itinerant ferromagnetic system characterized by a density of states that presents a moderately strong peak that is controlled by a specific parameter a and is positioned near the band edge. Specifically, we investigated the superconducting critical temperature, T _c, and the zero-temperature superconducting gap, Δ₀. The analysis is done...

article

Coexistence of Superconductivity and Itinerant Ferromagnetism in Ferromagnetic Metals UCoGe and UIr

Subhra Kakani, K. C. Pancholi, S. L. Kakani

Journal of Superconductivity and Novel Magnetism > 2011 > 24 > 5 > 1527-1545

A microscopic coexistence of itinerant ferromagnetism (FM) and superconductivity (SC) is studied in a single band homogenous system, following an equation of motion method and Green’s function technique. Self-consistent equations for superconducting order parameter (Δ) and magnetization parameter (M) are derived. It is shown that there generally exists a coexistent (Δ≠0, M≠0) solution to the coupled...

article

Pressure induced novel-phenomena in Mott insulator Ca2RuO4

Yohei Yamauchi, Fumihiko Nakamura, Mariko Sakaki, Tetsuo Takemoto, more

Physica C: Superconductivity > 2010 > 470 > S1 > S740-S741

In order to explore unconventional superconductivity, we have studied pressure effect on a 4d-electron Mott insulator Ca₂RuO₄. Pressurisation to Ca₂RuO₄ above 0.5GPa transforms it from a Mott insulator to a metal with a ferromagnetic ground state. The itinerancy of the ferromagnetic state at 2GPa is quantitatively evidenced by the magnetisation process at 2K. Moreover, the pressure phase diagram of...

article

Weakly first-order behavior in ferromagnetic transition of UCoGe revealed by 59Co-NQR studies

T. Hattori, K. Ishida, Y. Nakai, T. Ohta, more

Physica C: Superconductivity > 2010 > 470 > S1 > S561-S563

We have performed ⁵⁹Co nuclear quadrupole resonance (NQR) measurements on ferromagnetic (FM) superconductor UCoGe, in which ferromagnetism occurs at T_Curie∼2.5K. By measuring NQR spectrum at various temperatures, we investigated the development of local magnetic moment around T_Curie, and suggest that FM transition possesses weakly first-order character. This first-order behavior is consistent with...

article

Spin fluctuations and ferromagnetic order in two-dimensional itinerant systems with Van Hove singularities

P.A. Igoshev, A.A. Katanin, H. Yamase, V. Yu. Irkhin

Journal of Magnetism and Magnetic Materials > 2009 > 321 > 7 > 899-902

The quasistatic approach is used to analyze the criterion of ferromagnetism for two-dimensional (2D) systems with the Fermi level near Van Hove (VH) singularities of the electron spectrum. It is shown that the spectrum of spin excitations (paramagnons) is positively defined when the interaction between electrons and paramagnons, determined by the Hubbard on-site repulsion U, is sufficiently large...

article

Coexistence of Itinerant Ferromagnetism and Superconductivity in ZrZn₂

Shubhra Kakani, M. L. Kalra, S. L. Kakani

Journal of Superconductivity and Novel Magnetism > 2008 > 21 > 3 > 177-185

A microscopic coexistence of itinerant ferromagnetism and superconductivity is studied in a single- band homogeneous system, using an equation of motion method and Green’s function technique. Self-consistent equations for the superconducting order parameter Δ and magnetization m are derived. It is shown that there generally exists coexistent (Δ≠0 and m≠0) solutions to the coupled equations of the...

article

Interplay of Superconductivity and Ferromagnetism in UGe₂

Shubhra Kakani, M. L. Kalra, S. L. Kakani

Journal of Superconductivity and Novel Magnetism > 2008 > 21 > 5 > 301-311

The emergence of pressure induced superconductivity (SC) under the background of ferromagnetic state in 5f-electron based itinerant ferromagnetic superconductor UGe₂ is studied in the single band model by using a mean-field approximation. The solutions to the coupled equations of superconducting gap (Δ) and magnetization (m) are obtained using Green’s function technique and equation of motion method...

article

Large n-Expansion Limit of the Three-Dimensional Ferromagnetic Quantum Phase Transition

D. Bodea, M. Crisan, I. Grosu, I. Ţifrea

Journal of Low Temperature Physics > 2007 > 146 > 3-4 > 315-327

We use the large n-expansion method to study the role of the long-range interaction, topological and dissipation effects for the case of an itinerant quantum ferromagnet in the limit of the Landau–Ginzburg–Wilson theory. In the one-loop approximation, we calculate the explicit form of the electronic self-energy as a result of electron–fluctuation interaction and extract the temperature dependence...

article

Unconventional superconductivity in the itinerant ferromagnet UGe2:73Ge-NQR study under pressure

A. Harada, S. Kawasaki, H. Mukuda, Y. Kitaoka, more

Physica B: Physics of Condensed Matter > 2006 > 378-380 > Complete > 963-964

The superconducting characteristics on the itinerant ferromagnetic superconductor UGe ₂ have been investigated via the ⁷³ Ge-NQR measurements under pressure (P) near the critical pressure Px where the first-order transition takes place from the low-temperature (T) and low-P ferromagnetic phase (FM2) to high-T and high-P one (FM1). The measurements of nuclear spin-lattice relaxation...

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Symmetry‐Mismatch‐Induced Ferromagnetism in the Interfacial Layers of CaRuO₃/SrTiO₃ Superlattices

The Emergence of an Itinerant Ferromagnetic State in Co‐Doped YNi₅: A Critical Behavior Study of the Phase Transition

Critical phenomenon in the itinerant ferromagnet Cr11Ge19 studied by scaling of the magnetic entropy change

Enhanced ferromagnetism induced by structural phase transitions in Co2As1−xPx

Effect of external pressure on the magnetic properties of RCoAsO (R=La, Pr, Sm): a μSR study

Contact Potential Instability in the Path-Integral Description of Itinerant Ferromagnetism

Finite range and upper branch effects on itinerant ferromagnetism in repulsive Fermi gases: Bethe–Goldstone ladder resummation approach

Dominant itinerant ferromagnetism in Eu0.5Sr0.5CoO3: Evidences from both critical analysis and Rhodes-Wohlfarth’s criterion

Symmetry argument of cyano-bridged copper-molybdenum complexes

Correlation effect in bcc iron at finite temperatures

Repulsive polarons and itinerant ferromagnetism in strongly polarized Fermi gases

Superconductivity in Itinerant Ferromagnetic Systems

Coexistence of Superconductivity and Itinerant Ferromagnetism in Ferromagnetic Metals UCoGe and UIr

Pressure induced novel-phenomena in Mott insulator Ca2RuO4

Weakly first-order behavior in ferromagnetic transition of UCoGe revealed by 59Co-NQR studies

Spin fluctuations and ferromagnetic order in two-dimensional itinerant systems with Van Hove singularities

Coexistence of Itinerant Ferromagnetism and Superconductivity in ZrZn₂

Interplay of Superconductivity and Ferromagnetism in UGe₂

Large n-Expansion Limit of the Three-Dimensional Ferromagnetic Quantum Phase Transition

Unconventional superconductivity in the itinerant ferromagnet UGe2:73Ge-NQR study under pressure

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