Magnetization of Crystalline and Amorphous Phases of R2Ti2O7 and R2Zr2O7 (R = Gd, Dy, Tb)

Кузнецов, А. В.; Churkin, O. A.; Попов, В. В.; Щетинин, И. В.; Иванов, А. А.; Yastrebtsev, А. А.; Gaynanov, B. R.; Yaroslavtsev, Alexander; Chernysheva, Olga; d’Acapito, Francesco; Puri, Alessandro; Alekseev, P. A.; Менушенков, А. П.

doi:10.1007/s10948-019-05388-y

Cited by 7 publications

(5 citation statements)

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“…Hideo Aoki [92] This is a typical scenario near a Lifshitz transition for the appearing of a new Fermi surface spot described for organics [86] and predicted also for pressurized sulfur hydrides [93][94][95]. Advances on quantum mechanics of orbital physics which is today a hot topic have been obtained by Oleś group showing orbital dilution in d 4 oxides by tuning crystal field potential [96] and magnetic properties of crystalline and ferroelectric layered rare-earth-titanate by Kuznetsov et al [97]. Strain Induced orbital dynamics across the metal insulator transition in thin VO 2 films [98] provide further information on nanoscale phase separation in the correlation-driven insulator-metal transition in vanadium dioxide [99][100][101][102].…”

Section: The Superstripes 2019 Conferencementioning

confidence: 92%

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Bianconi

2020

J Supercond Nov Magn

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While in XX century the theory of superconductivity has focused on a homogeneous metal with a rigid lattice which can be reduced to a single effective conduction band in the dirty limit. Today in the XXI century, the physics of superconductivity is focusing on complexity of quantum matter where novel quantum functionalities with lattice inhomogeneity at nanoscale (between 1 nm and 100 nm) and at mesoscopic scale (in the range 100-10000 nm), where the electronic structure need to be described by multiple Fermi surfaces and multiple gaps in the superconducting phase in the clean limit. The present issue of Journal of superconductivity and Novel magnetism collects papers presented at the

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Section: The Superstripes 2019 Conferencementioning

confidence: 92%

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Bianconi

2020

J Supercond Nov Magn

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“…The x =0.9 sample already shows a saturation magnetization of 6.44(1) μ B Gd atom −1 , which corresponds to an almost parallel spin alignment in the magnetically ordered state. With the strong dilution of the gadolinium substructure, the magnetization isotherms more and more approach the Brillouin function for a free Gd 3+ ion ( S =7/2) [3,44–47] . The still active weak antiferromagnetic interactions in Gd 0.1 Y 0.9 AuMg weaken the effect of the external field on the gadolinium magnetic moments and result in a slight deviation from the Brillouin function.…”

Section: Methodsmentioning

confidence: 97%

“…With the strong dilution of the gadolinium substructure, the magnetization isotherms more and more approach the Brillouin function for a free Gd 3 + ion (S = 7/2). [3,[44][45][46][47] The still active weak antiferromagnetic interactions in Gd 0.1 Y 0.9 AuMg weaken the effect of the external field on the gadolinium magnetic moments and result in a slight deviation from the Brillouin function. Summing up, yttrium-gadolinium substitution in GdAuMg is an excellent tool for adjusting the Néel temperature.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Gadolinium spin dilution in the solid solution Gd_1–xY_xAuMg – gradual decrease of the Néel temperature

Reimann

Pöttgen

2021

Zeitschrift anorg allge chemie

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Dedicated to Professor Josef Breu on the Occasion of his 60 th Birthday.The intermetallic compounds GdAuMg and YAuMg form a continuous solid solution Gd 1-x Y x AuMg. Samples in x = 0.1 steps were synthesized from the elements in sealed tantalum ampoules in an induction furnace. Phase purity of the samples was checked by powder X-ray diffraction. The structures of two members of the solid solution were refined from single crystal X-ray diffractometer data: ZrNiAl type, P � 62m, a = 756.16( 6), c = 413.06(4) pm, wR2 = 0.0402, 328 F 2 values, 16 variables for Gd 0.80(2) Y 0.20(2) AuMg and a = 754.82(7), c = 411.24(4) pm, wR2 = 0.0292, 325 F 2 values, 16 variables for Gd 0.37(1) Y 0.63(1) AuMg. Temperature dependent magnetic susceptibility studies show a continuous decrease of the Néel temperature from T N = 81.1(1) K (GdAuMg) to 3.5(1) K (Gd 0.1 Y 0.9 AuMg). With increasing x in Gd 1-x Y x AuMg the saturation magnetization increases, with a maximal value of 6.44(1) μ B Gd atom À 1 for Gd 0.1 Y 0.9 AuMg at 3 K. The dilution of the gadolinium substructure with yttrium pushes the magnetization isotherms close to Brillouin type behavior (free Gd 3 + ).

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“…The stability of the pyrochlore structure is determined by two-parameters: radius ratio (r A /r B ) of cations A 3+ and B 4+ and the positional parameter x(O) of 48f site of the oxygen atom. For stable pyrochlore the r A /r B should lie in the range 1.48 -1.78 and x(O) ∼ 0.3323 [22]. Any deviation from these values gives rise to disorder in the pyrochlore lattice or the formation of a new lattice structure fluorite/perovskite.…”

Section: A Structural Studiesmentioning

confidence: 99%

Structure and magnetic studies of geometrically frustrated disordered pyrochlores A$_{2}$Zr$_{2}$O$_{7}$: (A = Eu, Gd, Er)

Yadav

2021

Preprint

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The spin ice system Dy2Ti2O7 exhibits strong frequency-dependent spin-freezing at ∼ 16 K temperature. Although it has been a matter of discussion for years, the origin of this unusual spin freezing is still unknown. The replacement of Ti with isovalent Zr leads to the dynamic magnetic ground state at low temperatures in Dy2Zr2O7 and prevents the formation of high-temperature spin freezing. Interestingly the high-temperature spin freezing re-emerges in the presence of the magnetic field. In this direction, we have studied a series of disordered pyrochlore oxides A2Zr2O7 (A = Eu, Gd, Er) and compared their crystal structure, magnetic, and heat capacity behavior with that of Dy2Zr2O7 and Ho2Zr2O7 systems. Our study shows that depending on the disordered parameter, the spin-freezing behavior can be retained by slowing down the spin dynamic with a suitable choice of the magnetic field. We observe that unlike titanates, modification at the rare earth site does not make considerable change in the magnetic ground state of these zirconates compounds.

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Magnetization of Crystalline and Amorphous Phases of R2Ti2O7 and R2Zr2O7 (R = Gd, Dy, Tb)

Cited by 7 publications

References 59 publications

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Gadolinium spin dilution in the solid solution Gd_1–xY_xAuMg – gradual decrease of the Néel temperature

Structure and magnetic studies of geometrically frustrated disordered pyrochlores A$_{2}$Zr$_{2}$O$_{7}$: (A = Eu, Gd, Er)

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Magnetization of Crystalline and Amorphous Phases of R2Ti2O7 and R2Zr2O7 (R = Gd, Dy, Tb)

Cited by 7 publications

References 59 publications

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Gadolinium spin dilution in the solid solution Gd1–xYxAuMg – gradual decrease of the Néel temperature

Structure and magnetic studies of geometrically frustrated disordered pyrochlores A$_{2}$Zr$_{2}$O$_{7}$: (A = Eu, Gd, Er)

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Gadolinium spin dilution in the solid solution Gd_1–xY_xAuMg – gradual decrease of the Néel temperature