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U D R, K A, S S, S R A, Dzubinska A, Reiffers M, Ramamoorthi N. Griffiths-like behavior and magnetocaloric properties of rare-earth silicide Tb 2Co 0.8Si 3.2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:195806. [PMID: 38306711 DOI: 10.1088/1361-648x/ad2586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 02/02/2024] [Indexed: 02/04/2024]
Abstract
Novel rare-earth silicide, Tb2Co0.8Si3.2compound, crystallizes in Lu2CoGa3structure, a distorted substitution variant of theAlB2structure. The compound exhibits a complex magnetic state, with a ferromagnetic transition at 58 K, followed by successive antiferromagnetic transitions at 24 K and 8 K, respectively. Isothermal and magnetic hysteresis studies indicate the prominence of competing antiferro and ferromagnetic interactions in the compound. However, this does not lead to the formation of spin glass behavior, as confirmed by AC magnetic susceptibility and heat capacity studies. In the paramagnetic state, the short-range ferromagnetic ordering of cobalt creates a Griffiths-like anomaly that is suppressed at higher magnetic fields. Investigation of magnetocaloric and magnetoresistance properties identifies the compound as a conventional second-order magnetocaloric material with negative magnetoresistance. Furthermore, the determination of Landau coefficients and subsequent analysis indicate that the isothermal entropy change of the compound can be calculated from these coefficients.
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Affiliation(s)
- Remya U D
- Intermetallics and Non-Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India
| | - Arun K
- Intermetallics and Non-Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India
| | - Swathi S
- Intermetallics and Non-Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India
| | - Athul S R
- Intermetallics and Non-Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India
| | | | - Marian Reiffers
- Faculty of Humanities and Natural Sciences, Presov University, Presov, Slovakia
- Institute of Experimental Physics, SAS, Kosice, Slovakia
| | - Nagalakshmi Ramamoorthi
- Intermetallics and Non-Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India
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Chatterjee S, Giri S, Majumdar S, Dutta P, Singha P, Banerjee A. Observation of Griffiths-like phase in the quaternary Heusler compound NiFeTiSn. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:295803. [PMID: 35533668 DOI: 10.1088/1361-648x/ac6e1f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 05/09/2022] [Indexed: 06/14/2023]
Abstract
The quaternary Heusler compound NiFeTiSn can be considered to be derived from the exotic pseudogap-compound Fe2TiSn by the replacement of one Fe atom by Ni. In contrast to Fe2TiSn, which shows a disorder induced ferromagnetic phase, the ground state of NiFeTiSn is antiferromagnetic with the signature of spin canting. Interestingly, NiFeTiSn shows a Griffiths-like phase characterized by isolated ferromagnetic clusters before attaining the antiferromagnetic state. The Griffiths-like phase is possibly associated with the antisite disorder between Fe and Ti sites as evident from our powder x-ray diffraction study. The compound also shows rather unusual temperature dependence of resistivity, which can be accounted by the prevailing structural disorder in the system. NiFeTiSn turned out to be a rare example where Griffiths-like phase is observed in a semiconducting 3dtransition metal based intermetallic compound with antiferromagnetic ground state.
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Affiliation(s)
- Snehashish Chatterjee
- School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Saurav Giri
- School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Subham Majumdar
- School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Prabir Dutta
- Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - Pintu Singha
- Department of Physics, University of Calcutta, Kolkata 700009, India
| | - Aritra Banerjee
- Department of Physics, University of Calcutta, Kolkata 700009, India
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Indra A, Mukherjee S, Gutowski O, Zimmermann MV, Majumdar S, Giri S. Structural correlation to ferroelectric order, non-Griffiths like phase and magnetocaloric effect in YbCrO 4. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:155402. [PMID: 35073536 DOI: 10.1088/1361-648x/ac4e46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 01/24/2022] [Indexed: 06/14/2023]
Abstract
We report a ferroelectric order around ∼99 K (TFE), which is considerably above the long range ferrimagnetic order at 25 K (TN). The value of saturation electric polarization is considerable as ∼570μC m-2for a poling field of 5 kV cm-1. The ferroelectric order is associated with a significant magnetoelectric coupling below ∼90 K. A weak signature ofTFEis observed in the dielectric constant, which is associated with a linear magnetodielectric response at 18 K(<TN). A transition to a polar structure has been correlated with the occurrence of ferroelectric order. A non-Griffiths like phase is observed around ∼48 K, which is also linked with the structural distortion. A reasonable value of the magnetic entropy change of 5.07 J Kg-1 K-1is noted atTNfor a change in field of 50 kOe, which involves a strong magnetoelastic coupling. The results indicate considerable structural instabilities, which is linked with the observed multifunctional properties of YbCrO4.
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Affiliation(s)
- A Indra
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
- Department of Physics, Srikrishna College, Bagula, Nadia, WB 741502, India
| | - S Mukherjee
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - O Gutowski
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - M V Zimmermann
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - S Majumdar
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - S Giri
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Chatterjee A, Indra A, Gutowski O, Zimmerman MV, Majumdar S, Giri S. Significant magneto-elastic coupling at Griffiths-like phase boundaries in low dimensional oxides, ASb 2O 6( A=Ni and Mn). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:195701. [PMID: 33542167 DOI: 10.1088/1361-648x/abe350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 02/04/2021] [Indexed: 06/12/2023]
Abstract
The compounds, NiSb2O6(NSO) and MnSb2O6(MSO) attract the community for the quasi one-dimensional and layered structure composed of Ni2+and Mn2+, which orders antiferromagnetically atTN= 6.7 and 12 K, respectively. Here, we report the Griffiths-like phase much aboveTNin the range of 37-85 K and 25-80 K for NSO and MSO, respectively. The dc magnetization results indicate the Griffiths-like phase, following the modified Curie-Weiss law. The magneto-capacitive responses for both the compounds show anomalies at the onset of the Griffiths-like phase. Intriguingly, the low temperature synchrotron diffraction results are conclusive for determining the singularities for both the compounds. Interplay between the low-dimensionality, magnetic frustration, and magneto-elastic coupling correlates the observed short range ordered state, which is suggested as a Griffiths-like phase, aboveTNfor both the compounds.
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Affiliation(s)
- A Chatterjee
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - A Indra
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
- Department of Physics, Sri Krishna College, Bagula, Nadia, W.B. 741502, India
| | - O Gutowski
- Deutsches Elektronen-Synchrotron, Notkestraβe 85, 22607 Hamburg, Germany
| | - M V Zimmerman
- Deutsches Elektronen-Synchrotron, Notkestraβe 85, 22607 Hamburg, Germany
| | - S Majumdar
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - S Giri
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Pal A, Singh P, Gangwar VK, Joshi AG, Khuntia P, Dwivedi GD, Gupta PK, Alam M, Anand K, Sethupathi K, Ghosh AK, Chatterjee S. Probing the Griffiths like phase, unconventional dual glassy states, giant exchange bias effects and its correlation with its electronic structure in Pr 2-x Sr x CoMnO 6. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:215801. [PMID: 31671415 DOI: 10.1088/1361-648x/ab5326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Crystal, electronic structure, dc and ac magnetization properties of the hole substituted (Sr2+) and partially B-site disordered double perovskite Pr2-x Sr x CoMnO6 system have been investigated. The XRD pattern analysis showed a systematic decrease in the lattice parameters owing to the enhanced oxidation states of the Co/Mn ions. The electronic structure study by XPS measurements suggested the presence of mixed valence states of the B-site ions (Co2+ /Co3+ and Mn3+ /Mn4+) with significant enhancement of the average oxidation states due to hole doping. The mere absence of electronic states near the Fermi level in the valence band (VB) spectra for both pure (x = 0.0) and Sr doped (x = 0.5) systems indicated the insulating nature of the samples. Sr substitution is observed to increase the spectral weight near the Fermi level suggesting for an enhanced conductivity of the hole doped system. The dc magnetization data divulged a Griffiths like phase above the long-range ordering temperature. A typical re-entrant spin glass like phase driven by the inherent anti-site disorder (ASD) has been recognized by ac susceptibility study for both the pure and doped systems. Most interestingly, the emergence of a new cluster glass like phase (immediately below the magnetic ordering temperature and above the spin-glass transition temperature) solely driven by the Sr substitution has been unravelled by ac magnetization dynamics study. Observation of these dual glassy states in a single system is scarce and hence placed the present system amongst the rare materials. The isothermal magnetization measurements further probed the exhibition of the giant exchange bias effect originated from the interfacial exchange interactions due to existence of low temperature antiferromagnetic clusters embedded in the glassy matrix.
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Affiliation(s)
- Arkadeb Pal
- Department of physics, Indian Institute of Technology (BHU) Varanasi, India. Department of physics, Indian Institute of Technology, Madras, India
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Kamel R, Tozri A, Dhahri E, Hlil EK. Anomalous behavior above the Curie temperature in (Nd 1-x Gd x ) 0.55Sr 0.45MnO 3 ( x = 0, 0.1, 0.3 and 0.5). RSC Adv 2019; 9:27541-27548. [PMID: 35529229 PMCID: PMC9070623 DOI: 10.1039/c9ra03303c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 08/16/2019] [Indexed: 11/23/2022] Open
Abstract
Magnetic properties were studied just above the ferromagnetic–paramagnetic (FM–PM) phase transition of (Nd1−xGdx)0.55Sr0.45MnO3 with x = 0, 0.1, 0.3 and 0.5. The low-field inverse susceptibility (χ−1) of Nd0.55Sr0.45MnO3 exhibits a Curie–Weiss-PM behavior. For x ≥ 0.1, we observe a deviation in χ−1(T) behavior from the Curie–Weiss law. The anomalous behavior of the χ−1(T) was qualified as Griffiths phase (GP)-like. The study of the evolution of the GP through a susceptibility exponent, the GP temperature and the temperature range of the GP reveals that the origin of the GP is primary due to the accommodated strain. Likewise, the magnetic data reveal distinct features visible only for x = 0.5 at a low magnetic field that can be qualitatively understood as the result of ferromagnetic polarons, entailed by the strong effect of chemical/structural disorder, whose concentration increases upon cooling towards the Curie temperature. We explained the magnetic properties at a high temperature for the heavily Gd-doped sample (x = 0.5) within the phase-separation scenario as an assembly of ferromagnetic nanodomains, antiferromagnetically coupled by correlated Jahn–Teller polarons. Magnetic properties were studied just above the ferromagnetic–paramagnetic (FM–PM) phase transition of (Nd1−xGdx)0.55Sr0.45MnO3 with x = 0, 0.1, 0.3 and 0.5.![]()
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Affiliation(s)
- R Kamel
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B. P. 1171 Sfax 3000 Tunisia
| | - A Tozri
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B. P. 1171 Sfax 3000 Tunisia .,Physics Department, College of Science, Jouf University P. O. Box: 2014 Sakaka Saudi Arabia
| | - E Dhahri
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B. P. 1171 Sfax 3000 Tunisia
| | - E K Hlil
- Institut Néel, CNRS - Université J. Fourier B. P. 166 38042 Grenoble France
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Chakraborty T, Nair HS, Nhalil H, Ramesh Kumar K, Strydom AM, Elizabeth S. Disordered ferromagnetism in Ho 2NiMnO 6 double perovskite. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:025804. [PMID: 27842004 DOI: 10.1088/0953-8984/29/2/025804] [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
Magnetic and dielectric properties of the double perovskite Ho2NiMnO6 are reported. The compound is synthesized by nitrate route and is found to crystallize in monoclinic P21/n space group. Lattice parameters obtained by refining powder x-ray diffraction data are; a = 5.218(2) Å, b = 5.543(2) Å, c = 7.480(3) Å and the monoclinic angle is [Formula: see text](4). A phase transition is observed at [Formula: see text] K in the temperature-dependent magnetization curve, M(T). The inverse magnetic susceptibility, (1/[Formula: see text]) fits reasonably well with modified Curie-Weiss law by incorporating the paramagnetic response of Ho3+. 1/[Formula: see text] manifests as an upward deviation from ideal Curie-Weiss behaviour well above the ferromagnetic transition. Signs of inherent Griffiths phase pertaining to the Ni/Mn subsystem are visible when one subtracts the Ho3+ paramagnetic contribution from total susceptibility and does the power-law analysis. The magnetic hysteresis at 2 K gives the maximum value of magnetization [Formula: see text] [Formula: see text]/f.u. at 50 kOe. Field-derivative of magnetization at 2 K shows discontinuities which indicates the existence of metamagnetic transitions in this compound. This needs to be probed further. Out of the two dielectric relaxations observed, the one at low temperature may be attributed to phononic frequencies and that at higher temperature may be due to Maxwell-Wagner relaxation. A correlation between magnetic and lattice degrees of freedom is plausible since the anomaly in dielectric constant coincides with T C.
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Ghosh K, Mazumdar C, Ranganathan R, Mukherjee S. Griffiths phase behaviour in a frustrated antiferromagnetic intermetallic compound. Sci Rep 2015; 5:15801. [PMID: 26515256 PMCID: PMC4626802 DOI: 10.1038/srep15801] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 09/25/2015] [Indexed: 11/30/2022] Open
Abstract
The rare coexistence of a Griffiths phase (GP) and a geometrically frustrated antiferromagnetism in the non-stoichiometric intermetallic compound GdFe0.17Sn2 (the paramagnetic Weiss temperature θp ~ −59 K) is reported in this work. The compound forms in the Cmcm space group with large structural anisotropy (b/c ~ 4). Interestingly, all the atoms in the unit cell possess the same point group symmetry (Wycoff position 4c), which is rather rare. The frustration parameter, f = |θp|/TN has been established as 3.6, with the Néel temperature TN and Griffiths temperature TG being 16.5 and 32 K, respectively. The TG has been determined from the heat capacity measurement and also from the magnetocaloric effect (MCE). It is also shown that substantial difference in GP region may exist between zero field and field cooled measurements - a fact hitherto not emphasized so far.
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Affiliation(s)
- Krishanu Ghosh
- Department of Physics, The University of Burdwan, Golapbag, Bardhaman - 713104, West Bengal, India
| | - Chandan Mazumdar
- Condensed Matter Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India
| | - R Ranganathan
- Condensed Matter Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India
| | - S Mukherjee
- Department of Physics, The University of Burdwan, Golapbag, Bardhaman - 713104, West Bengal, India
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