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Mentré O, Leclercq B, Arevalo-Lopez AM, Pautrat A, Petit S, Minaud C, Daviero-Minaud S, Hovhannisyan RA, Stolyarov VS. Multivalued Memory via Freezing of Super-Hard Magnetic Domains in a Quasi 2D-Magnet. SMALL METHODS 2023; 7:e2300491. [PMID: 37490517 DOI: 10.1002/smtd.202300491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 06/26/2023] [Indexed: 07/27/2023]
Abstract
The design of high-density non-volatile memories is a long-standing dream, limited by conventional storage "0" or "1" bits. An alternative paradigm exists in which regions within candidate materials can be magnetized to intermediate values between the saturation limits. In principle, this paves the way to multivalued bits, vastly increasing storage density. Single-molecule magnets, are good examples offering transitions between intramolecular quantum levels, but require ultra-low temperatures and limited relaxation time between magnetization states. It is showed here that the quasi 2D-Ising compound BaFe2 (PO4 )2 overcomes these limitations. The combination of giant magneto-crystalline anisotropy, strong ferromagnetic exchange, and strong intrinsic pinning creates remarkably narrow magnetic domain walls, collectively freezing under Tf ≈15 K. This results in a transition from a soft to a super-hard magnet (coercive force > 14 T). Any magnetization can then be printed and robustly protected from external fields with an energy barrier >9T at 2 K.
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Affiliation(s)
- Olivier Mentré
- UCCS - Axe Chimie du Solide - Groupe MISSP, UMR-CNRS 8181, Université de Lille, Cedex, 59652, France
| | - Bastien Leclercq
- UCCS - Axe Chimie du Solide - Groupe MISSP, UMR-CNRS 8181, Université de Lille, Cedex, 59652, France
| | - Angel M Arevalo-Lopez
- UCCS - Axe Chimie du Solide - Groupe MISSP, UMR-CNRS 8181, Université de Lille, Cedex, 59652, France
| | - Alain Pautrat
- CRISMAT, CNRS, Normandie Univ, ENSICAEN, UNICAEN, Caen, 14050, France
| | - Sylvain Petit
- Laboratoire Léon Brillouin, CEA, CNRS, Université Paris-Saclay, Gif sur Yvette Cedex, F-91191, France
| | - Claire Minaud
- Institut Michel-Eugène Chevreul - CNRS (FR2638), Université de Lille, Université d'Artois, Centrale Lille, CNRS, l'INRAE, Villeneuve-d'Ascq, 59650, France
| | - Sylvie Daviero-Minaud
- UCCS - Axe Chimie du Solide - Groupe MISSP, UMR-CNRS 8181, Université de Lille, Cedex, 59652, France
| | - Razmik A Hovhannisyan
- Advanced Mesoscience and Nanotechnology Centre, Moscow Institute of Physics and Technology, Dolgoprudny, 141700, Russia
| | - Vasily S Stolyarov
- Advanced Mesoscience and Nanotechnology Centre, Moscow Institute of Physics and Technology, Dolgoprudny, 141700, Russia
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Chandra M, Yadav S, Rawat R, Singh K. Enhancement of magnetoelectric coupling in Cr doped Mn 2O 3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:295703. [PMID: 32168503 DOI: 10.1088/1361-648x/ab7fdc] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The effect of Cr doping has been undertaken to investigate its effect on the structural, magnetic, dielectric and magnetoelectric properties of newly discovered multiferroics material α-Mn2O3. The Cr doping modifies the room temperature crystal symmetry i.e. transforms from orthorhombic to cubic symmetry. Similar to α-Mn2O3, two magnetic transitions have been observed in all Cr doped samples. The effect of Cr doping manifested on the low temperature transition. The lower magnetic transition shifted toward higher temperature (25 K for pristine to 40 K for Cr = 10%) whereas the high temperature transition decreases slightly with increasing Cr content. A clear frequency independent transition is observed in temperature dependent complex dielectric measurements for Mn2-x Cr x O3 (0 ⩽ x ⩽ 0.10) samples around high temperature magnetic ordering ∼80 K which corroborate the magnetoelectric coupling in these samples. Interestingly, the magnetodielectric value enhanced significantly with Cr doping and a maximum increase of ∼21% is observed for 10% Cr doped sample at 5 K around 70 kOe magnetic field.
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Affiliation(s)
- Mohit Chandra
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, 452001, India
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Gupta S, Upadhyay SK, Siruguri V, Sathe VG, Sampathkumaran EV. Observation of magnetoelastic and magnetoelectric coupling in Sc doped BaFe 12O 19 due to spin-glass-like phase. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:295701. [PMID: 30965302 DOI: 10.1088/1361-648x/ab1798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The present work reports magnetic, magnetoelastic and magnetoelectric (ME) response of scandium (Sc) doped barium hexaferrite, BaFe10Sc2O19. DC magnetization shows that partial substitution of non-magnetic Sc for Fe in barium hexaferrite results in a reduction of Curie temperature (T C) from 730 K known for the parent compound BaFe12O19 to 430 K. Magnetization measurements show that, in BaFe10Sc2O19, in addition to the magnetic transition at 250 K corresponding to longitudinal conical magnetic structure, another magnetic anomaly occurs in the vicinity of 50 K (T max). Ac susceptibility and magnetic relaxation show that the magnetic transition at T max is associated with spin glass like dynamics. Field dependence of this glassy transition temperature follows the Almeida-Thouless (A-T) line expected for spin glass-like behaviour. Unit cell volume obtained from the neutron diffraction (ND) measurements shows deviation from the Debye-Gruneisen behaviour below 50 K, revealing the magnetoelastic coupling. Existence of magnetoelastic coupling is also confirmed by Raman spectra as Raman modes show anomalous changes around 50 K and also indicates presence of lattice modulation. Further, the magnetic structure obtained from ND data shows that incommensurate longitudinal conical ferrimagnetic structure persists from 210 K to 3 K. The integrated intensity of (0 0 2) peak and magnetic moments undergoes a subtle change below 50 K that seems to favour coexistence of long range magnetic ordering and spin glass-like dynamics. Significant magneto-dielectric effect was observed around 50 K. Temperature dependent studies of dielectric constant and pyroelectric current indicate the presence of ferroelectricity even in zero magnetic field. Further, existence of ME coupling below 50 K is confirmed by temperature dependence of pyroelectric current under magnetic fields up to 70 kOe. In short, this work identifies a new magnetic anomaly around 50 K, which is spin-glass-like inducing magnetoelastic and ME anomalies, even in the absence of external magnetic fields.
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Affiliation(s)
- Surbhi Gupta
- UGC-DAE Consortium for Scientific Research, Mumbai Centre, BARC Campus, Mumbai 400085, India
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Nandi M, Prabhakaran D, Mandal P. Spin-charge-lattice coupling in quasi-one-dimensional Ising spin chain CoNb 2O 6. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:195802. [PMID: 30731434 DOI: 10.1088/1361-648x/ab0539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Magnetization, magnetostriction and dielectric constant measurements are performed on single crystals of quasi-one-dimensional Ising spin chain CoNb2O6 at temperatures below and above the antiferromagnetic phase transition. Field-induced magnetic transitions are clearly reflected in magnetodielectric and magnetostriction data. Sharp anomalies are observed around the critical fields of antiferromagnetic to ferrimagnetic and ferrimagnetic to saturated-paramagnetic transition in both magnetodielectric and magnetostriction experiments. Detailed analysis of temperature and field dependence of dielectric constant and magnetostriction suggests that spins are coupled with lattice as well as charges in CoNb2O6. Below the antiferromagnetic transition temperature, the overall resemblance in anomalies, observed in various physical parameters such as magnetization, dielectric constant, magnetostriction and magnetic entropy change gives a deeper insight about the influence of spin configuration on these parameters in CoNb2O6.
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Affiliation(s)
- Moumita Nandi
- Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Calcutta 700 064, India
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Upadhyay SK, Iyer KK, Gohil S, Ghosh S, Paulose PL, Sampathkumaran EV. Pyrocurrent anomalies and intrinsic magnetodielectric behavior near room temperature in Li 2Ni 2Mo 3O 12, a compound with distorted honeycomb and spin-chains. Sci Rep 2017; 7:4449. [PMID: 28667268 PMCID: PMC5493632 DOI: 10.1038/s41598-017-04025-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 05/08/2017] [Indexed: 11/09/2022] Open
Abstract
Keeping current interests to identify materials with intrinsic magnetodielectric behaviour near room temperature and with novel pyroelectric current anomalies, we report temperature and magnetic-field dependent behavior of complex dielectric permittivity and pyroelectric current for an oxide, Li2Ni2Mo3O12, containing magnetic ions with (distorted) honey-comb and chain arrangement and ordering magnetically below 8 K. The dielectric data reveal the existence of relaxor ferroelectricity behaviour in the range 160-240 K and there are corresponding Raman mode anomalies as well in this temperature range. Pyrocurrent behavior is also consistent with this interpretation, with the pyrocurrent peak-temperature interestingly correlating with the poling temperature. 7Li NMR offer an evidence for crystallographic disorder intrinsic to this compound and we therefore conclude that such a disorder is apparently responsible for the randomness of local electric field leading to relaxor ferroelectric property. Another observation of emphasis is that there is a notable decrease in the dielectric constant with the application of magnetic field to the tune of about -2.4% at 300 K, with the magnitude varying marginally with temperature. Small loss factor values validate the intrinsic behaviour of the magnetodielectric effect at room temperature.
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Affiliation(s)
- Sanjay Kumar Upadhyay
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, 400005, India
| | - Kartik K Iyer
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, 400005, India
| | - Smita Gohil
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, 400005, India
| | - Shankar Ghosh
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, 400005, India
| | - P L Paulose
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, 400005, India
| | - E V Sampathkumaran
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, 400005, India.
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Schmidt M, Zimmer FM, Magalhaes SG. Spin liquid and infinitesimal-disorder-driven cluster spin glass in the kagome lattice. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:165801. [PMID: 28300040 DOI: 10.1088/1361-648x/aa6060] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The interplay between geometric frustration (GF) and bond disorder is studied in the Ising kagome lattice within a cluster approach. The model considers antiferromagnetic short-range couplings and long-range intercluster disordered interactions. The replica formalism is used to obtain an effective single cluster model from where the thermodynamics is analyzed by exact diagonalization. We found that the presence of GF can introduce cluster freezing at very low levels of disorder. The system exhibits an entropy plateau followed by a large entropy drop close to the freezing temperature. In this scenario, a spin-liquid (SL) behavior prevents conventional long-range order, but an infinitesimal disorder picks out uncompensated cluster states from the multi-degenerate SL regime, potentializing the intercluster-disordered coupling and bringing the cluster spin-glass state. To summarize, our results suggest that the SL state combined with low levels of disorder can activate small clusters, providing hypersensitivity to the freezing process in geometrically frustrated materials and playing a key role in the glassy stabilization. We propose that this physical mechanism could be present in several geometrically frustrated materials. In particular, we discuss our results in connection with the recent experimental investigations of the Ising kagome compound Co3Mg(OH)6Cl2.
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Affiliation(s)
- M Schmidt
- Departamento de Física, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
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Sharma MK, Basu T, Mukherjee K, Sampathkumaran EV. Enhancement of magnetic ordering temperature and magnetodielectric coupling by hole doping in a multiferroic DyFe 0.5Cr 0.5O 3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:085801. [PMID: 28060774 DOI: 10.1088/1361-648x/aa5472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the results of our investigation of magnetic, thermodynamic and dielectric properties of Ca substituted half-doped orthochromite, Dy0.6Ca0.4Fe0.5Cr0.5O3. Magnetic susceptibility and heat capacity data bring out that this compound undergoes two antiferromagnetic transitions, one at ~132 and the other at ~22 K. These values are higher than those of DyFe0.5Cr0.5O3. This finding highlights that non-magnetic hole doping in form of Ca+2 in the place of magnetic Dy+3 tends to enhance magnetic transition temperatures in this half-doped orthochromite. We attribute it to possible change in the valence state of Cr/Fe-ion ions due to hole doping. Dielectric anomalies are also seen near the magnetic ordering temperatures indicating magnetodielectric coupling, which is confirmed by magnetic field dependent dielectric studies. The most notable observation is that magnetodielectric coupling strength gets significantly enhanced as compared to DyFe0.5Cr0.5O3. The results reveal that it is possible to tune magnetodielectric coupling by hole doping in this system.
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Affiliation(s)
- Mohit K Sharma
- School of Basic Sciences, Indian Institute of Technology Mandi, Mandi 175005, Himachal Pradesh, India
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Sharma MK, Basu T, Mukherjee K, Sampathkumaran EV. Effect of rare-earth (Er and Gd) substitution on the magnetic and multiferroic properties of DyFe0.5Cr0.5O3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:426003. [PMID: 27588356 DOI: 10.1088/0953-8984/28/42/426003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the results of our investigations on the influence of partial substitution of Er and Gd for Dy on the magnetic and magnetoelectric properties of DyFe0.5Cr0.5O3, which is known to be a multiferroic system. Magnetic susceptibility and heat capacity data, apart from confirming the occurrence of magnetic transitions at ~121 and 13 K in DyFe0.5Cr0.5O3, bring out that the lower transition temperature only is suppressed by rare-earth substitution. Multiferroic behavior is found to persist in Dy0.4Ln0.6Fe0.5Cr0.5O3 (Ln = Er and Gd). There is an evidence for magnetoelectric coupling in all these materials with qualitative differences in its behavior as the temperature is changed across these two transitions. Remnant electric polarization is observed for all the compounds. The most notable observation is that electric polarization is seen to get enhanced as a result of rare-earth substitution with respect to that in DyFe0.5Cr0.5O3. Interestingly, a similar trend is seen in the magnetocaloric effect, consistent with the existence of magnetoelectric coupling. The results thus provide evidence for the tuning of magnetoelectric coupling by rare-earth substitution in this family of oxides.
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Affiliation(s)
- Mohit K Sharma
- School of Basic Sciences, Indian Institute of Technology Mandi, Mandi 175005, Himachal Pradesh, India
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Basu T, Kishore VVR, Gohil S, Singh K, Mohapatra N, Bhattacharjee S, Gonde B, Lalla NP, Mahadevan P, Ghosh S, Sampathkumaran EV. Displacive-type ferroelectricity from magnetic correlations within spin-chain. Sci Rep 2014; 4:5636. [PMID: 25005869 PMCID: PMC4088096 DOI: 10.1038/srep05636] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 06/23/2014] [Indexed: 11/09/2022] Open
Abstract
Observation of ferroelectricity among non-d(0) systems, which was believed for a long time an unrealistic concept, led to various proposals for the mechanisms to explain the same (i.e. magnetically induced ferroelectricity) during last decade. Here, we provide support for ferroelectricity of a displacive-type possibly involving magnetic ions due to short-range magnetic correlations within a spin-chain, through the demonstration of magnetoelectric coupling in a Haldane spin-chain compound Er2BaNiO5 well above its Néel temperature of (TN = ) 32 K. There is a distinct evidence for electric polarization setting in near 60 K around which there is an evidence for short-range magnetic correlations from other experimental methods. Raman studies also establish a softening of phonon modes in the same temperature (T) range and T-dependent x-ray diffraction (XRD) patterns also reveal lattice parameters anomalies. Density-functional theory based calculations establish a displacive component (similar to d(0)-ness) as the root-cause of ferroelectricity from (magnetic) NiO6 chain, thereby offering a new route to search for similar materials near room temperature to enable applications.
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Affiliation(s)
- Tathamay Basu
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India
| | - V. V. Ravi Kishore
- S. N. Bose National Centre for Basic Sciences, Sector-III, Block-JD, Salt Lake, Kolkata - 700 098, India
| | - Smita Gohil
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India
| | - Kiran Singh
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore - 452001, India
| | - N. Mohapatra
- School of Basic Sciences, Indian Institute of Technology Bhubaneshwar, Bhubaneshwar-751013, India
| | - S. Bhattacharjee
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India
| | - Babu Gonde
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India
| | - N. P. Lalla
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore - 452001, India
| | - Priya Mahadevan
- S. N. Bose National Centre for Basic Sciences, Sector-III, Block-JD, Salt Lake, Kolkata - 700 098, India
| | - Shankar Ghosh
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India
| | - E. V. Sampathkumaran
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India
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Basu T, Paulose PL, Iyer KK, Singh K, Mohapatra N, Chowki S, Gonde B, Sampathkumaran EV. A reentrant phenomenon in magnetic and dielectric properties of Dy2BaNiO5 and an intriguing influence of external magnetic field. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:172202. [PMID: 24722401 DOI: 10.1088/0953-8984/26/17/172202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report that the spin-chain compound Dy2BaNiO5, recently proven by us to exhibit magnetoelectric coupling below its Néel temperature (TN) of 58 K, exhibits strong frequency-dependent behavior in ac magnetic susceptibility and complex dielectric properties at low temperatures (<10 K), mimicking the 'reentrant' multiglass phenomenon. Such a behavior is not known among undoped compounds. A new finding in the field of multiferroics is that the characteristic magnetic feature at low temperatures moves towards higher temperatures in the presence of a magnetic field (H), whereas the corresponding dielectric feature shifts towards lower temperatures with H, unlike the situation near TN. This observation indicates that the alignment of spins by external magnetic fields tends to inhibit glassy-like slow electric-dipole dynamics, at least in this system, possibly arising from peculiarities in the magnetic structure.
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Affiliation(s)
- Tathamay Basu
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
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Basu T, Singh K, Sampathkumaran EV. Modifications in the frustrated magnetism, oxidation state of Co and magnetoelectric coupling effects induced by a partial replacement of Ca by Gd in the spin-chain compound Ca3Co2O6. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:496013. [PMID: 24222434 DOI: 10.1088/0953-8984/25/49/496013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We have systematically investigated the influence of the gradual replacement of Ca by Gd on the magnetic and complex dielectric properties of the well-known geometrically frustrated spin-chain system Ca3Co2O6 (TN = 24 K with additional magnetic transitions below 12 K), by studying the series Ca3−xGdxCo2O6 (x ≤ 0.7), down to 1.8 K. Heat-capacity measurements establish that the reduction of TN with Gd substitution is much less compared to that by Y substitution. The magnetic moment data reveal that there are changes in the oxidation state of Co as well, unlike for Y substitution, beyond x = 0.2. Thus, despite being isovalent, both these substitutions interestingly differ in changing these magnetic properties in these oxides. We propose that the valence electrons of Y and those of R ions play different roles in deciding the magnetic characteristics of these mixed oxides. It is observed that a small amount (x = 0.3) of Gd substitution for Ca is enough to suppress glassy ac magnetic susceptibility behavior for the peak around 12 K. An additional low-temperature magnetic anomaly close to 5 K gets more prominent with increasing Gd concentration as revealed by heat-capacity data. Trends in temperature dependence of complex dielectric behavior were also tracked with varying composition and a frequency dependence is observed, not only for the transition in the region around 10 K (for some compositions), but also for the 5 K transition which is well resolved for a higher concentration of Gd. Thus, the Gd-substituted Ca3Co2O6 series is shown to reveal interesting magnetic and dielectric behaviors of this family of oxides.
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