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Kaul, S. N.; Siruguri, V.; Chandra, Girish

doi:10.1103/physrevb.45.12343

Cited by 96 publications

(45 citation statements)

References 52 publications

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“…Whereas above ∼ 10 K it exhibits pronounced double-peak shape, just a narrow peak with a slight shoulder is observed at base temperature. These findings are precisely opposite to the expectations for inhomogeneous (cluster-like) scenario 29 . That the magnetic state below about 10 K is homogeneous as sensed by the Mössbauer nuclei, is also supported by the nearly coinciding saturation values of B hf for the two contributions.…”

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Microscopic coexistence of antiferromagnetic and spin-glass states

et al. 2013

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The disordered antiferromagnet PbFe 1/2 Nb 1/2 O3 (PFN ) is investigated in a wide temperature range by combining Mössbauer spectroscopy and neutron diffraction experiments. It is demonstrated that the magnetic ground state is a microscopic coexistence of antiferromagnetic and a spin-glass orders. This speromagnet-like phase features frozen-in short-range fluctuations of the Fe 3+ magnetic moments that are transverse to the long-range ordered antiferromagnetic spin component.Phase transitions in the presence of disorder and/or competing interactions are one of the central unresolved problems in modern condensed matter physics 1-4 . With both effects present, one may encounter a freezing of microscopic degrees of freedom without conventional longrange order. In magnetic systems, the corresponding phenomenon is referred to as a spin-glass (SG) transition 5 . By now, spin glasses are reasonably well understood for models with discrete (Ising) symmetries and long-range interactions 6,7 . In contrast, for continuous (Heisenberg and XY) symmetries with short-range coupling, the properties and sometimes the very existence of the SG phase remain a matter of debate [8][9][10][11][12] . An important outstanding question is whether the SG phase can coexist with true long-range order (LRO) 12,13 ? Theory 14-16 and numerical studies 17-20 have consistently provide an affirmative answer; see Ref.21 for a review. Both ferromagnetic (FM) 15 and AF 16 models demonstrate a SG freezing of spin components transverse to the long range order parameter. The problem gained a particular urgency in the context of cuprate superconductors, where SG and AF phases are adjacent on the concentrationtemperature phase diagram but appear to be mutually exclusive 22,23 .On the experimental side though, the situation is much less clear-cut and hotly debated. Most hurdles on this route are the known measurement issues endemic to spin glasses 1,24,25 . In addition, even if long range order and SG are shown to appear simultaneously, it may be extremely difficult to establish their co-existence on the microscopic scale, as opposed to an inhomogeneous phase separation. A great deal of work was done on amorphous, ferromagnetic Fe X Zr 100−X alloys. While strong support for uniformly coexisting SG and LRO in these systems have been presented 20,[26][27][28] , evidence pointing to a cluster-based scenario also exist 29 . In crystalline materials, simultaneous antiferromagnetic (AF) and SG states have been observed in Fe 0.6 Mn 0.4 TiO 3 30,31 and Co 2 (OH)PO 4 32 . However, even in these Ising systems, the microscopic nature of such coexistence is not unambiguous 31,32 .A solid experimental proof of microscopic SG and LRO coexistence in a crystalline material remains elu- sive. Besides finding an appropriate model compound, one has to strategically choose the experimental techniques. Momentum-resolved (scattering) experiments are well-suited to probe microscopic quantities averaged over the entire sample, but do not provide spatiallyresolved information. I...

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“…A great deal of work was done on amorphous, ferromagnetic Fe X Zr 100−X alloys. While strong support for uniformly coexisting SG and LRO in these systems have been presented 20,[26][27][28] , evidence pointing to a cluster-based scenario also exist 29 . Our target material, abbreviated PFN , is a well-known complex perovskite.…”

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Microscopic coexistence of antiferromagnetic and spin-glass states

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“…The amorphous Fe-Zr alloys have attracted much attention to both experimental and theoretical physicists (see [1] for references). These alloys show unusual compositional dependence of magnetic and transport properties.…”

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Spin-Wave Excitations and Fluctuations of the Exchange Interaction in Amorphous Fe_1-xZr_xAlloys

1993

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Detailed magnetization measurements were performed on amorphous F e 1 -x Z r x a l l o y s w i t h 0 . 1 4 < x < 0 . 4 8 a t t e m p e r a t u r e s r a n g i n g f r o m 4 . 2 K t o the Curie temperature in external magnetic field up to 5 T. An analysis of the experimental data reveals that' the fluctuations of the exchange integral resulting froni the structural disorder give important contribution to the thermal demagnetization and high-field susceptibility of Fe-rich alloys. For Zr-rich alloys the effect of fluctuations of the exchange integral is negligible and thermal demagnetization is described in terms of spin-wave excitations.No Stoner single-particle excitations were observed for alloys with x > 0.14.

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“…The Fe-Zr-B-Cu amorphous alloys with high iron content comprise of a very interesting group of materials; they exhibit a selection of anomalies due to lack of long range order in their atomic structure [1][2][3]. Moreover, with their specific chemical composition, their Curie temperature is close to room temperature which allows for their application in magnetic refrigerators.…”

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Microstructure and Soft Magnetic Properties of Fe-Zr-(Pt)-Nb-Cu-B Amorphous Alloys

Gondro

Błoch

Nabiałek

et al. 2017

Archives of Metallurgy and Materials

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alloys. The alloys were investigated in their as-quenched state, in the form of thin ribbons with approximate dimensions as follows: width 3 mm and thickness 20 μm.The investigations were performed utilizing Mössbauer spectrometry and X-ray diffractometry. Also, an evaluation of the low-field magnetic susceptibility and measurements of the magnetization versus temperature and magnetizing field were performed.

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Magnetization and Mössbauer study of the reentrant amorphousFe90Zr10

Cited by 96 publications

References 52 publications

Microscopic coexistence of antiferromagnetic and spin-glass states

Microscopic coexistence of antiferromagnetic and spin-glass states

Spin-Wave Excitations and Fluctuations of the Exchange Interaction in Amorphous Fe_1-xZr_xAlloys

Microstructure and Soft Magnetic Properties of Fe-Zr-(Pt)-Nb-Cu-B Amorphous Alloys

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Magnetization and Mössbauer study of the reentrant amorphousFe90Zr10

Cited by 96 publications

References 52 publications

Microscopic coexistence of antiferromagnetic and spin-glass states

Microscopic coexistence of antiferromagnetic and spin-glass states

Spin-Wave Excitations and Fluctuations of the Exchange Interaction in Amorphous Fe1-xZrxAlloys

Microstructure and Soft Magnetic Properties of Fe-Zr-(Pt)-Nb-Cu-B Amorphous Alloys

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Product

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Spin-Wave Excitations and Fluctuations of the Exchange Interaction in Amorphous Fe_1-xZr_xAlloys