Sökning: WFRF:(Sarkar R.)
> (2020-2024) >
Neutron diffraction...
Neutron diffraction evidence for local spin canting, weak Jahn-Teller distortion, and magnetic compensation in Ti1-xMnxCo2O4 spinel
-
- Pramanik, P. (författare)
- Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, Assam, India
-
- Joshi, Deep C. (författare)
- Uppsala universitet,Fasta tillståndets fysik,Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, Assam, India
-
- Reehuis, M. (författare)
- Helmholtz Zentn Berlin Mat & Energie, Hahn Meitner Pl 1, D-14109 Berlin, Germany
-
visa fler...
-
- Hoser, A. (författare)
- Helmholtz Zentn Berlin Mat & Energie, Hahn Meitner Pl 1, D-14109 Berlin, Germany
-
- Hoffmann, J-U (författare)
- Helmholtz Zentn Berlin Mat & Energie, Hahn Meitner Pl 1, D-14109 Berlin, Germany
-
- Manna, R. S. (författare)
- Indian Inst Technol Tirupati, Dept Phys, Tirupati 517506, Andhra Pradesh, India
-
- Sarkar, Tapati (författare)
- Uppsala universitet,Fasta tillståndets fysik
-
- Thota, S. (författare)
- Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, Assam, India
-
visa färre...
-
(creator_code:org_t)
- IOP PUBLISHING LTD, 2020
- 2020
- Engelska.
-
Ingår i: Journal of Physics. - : IOP PUBLISHING LTD. - 0953-8984 .- 1361-648X. ; 32:24
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- A systematic study using neutron diffraction and magnetic susceptibility is reported on Mn substituted ferrimagnetic inverse spinel Ti1-xMnxCo2O4 in the temperature interval 1.6 K T 300 K. Our neutron diffraction study reveals cooperative distortions of the TO6 octahedra in the Ti1-xMnxCo2O4 system for all the Jahn-Teller active ions T = Mn3+ , Ti3+ and Co3+ , having the electronic configurations 3d(1), 3d(4) and 3d(6), respectively which are confirmed by the x-ray photoelectron spectroscopy. Two specific compositions (x = 0.2 and 0.4) have been chosen in this study because these two systems show unique features such as; (i) noncollinear Yafet-Kittel type magnetic ordering, and (ii) weak tetragonal distortion with c/a < 1, in which the apical bond length d(c)(T-B-O) is longer than the equatorial bond length d(ab)(T-B-O) due to the splitting of the e(g) level of Mn3+ ions into and . For the composition x = 0.4, the distortion in the TBO6 octahedra is stronger as compared to x = 0.2 because of the higher content of trivalent Mn. Ferrimagnetic ordering in Ti0.6Mn0.4Co2O4 and Ti0.8Mn0.2Co2O4 sets in at 110.3 and 78.2 K, respectively due to the presence of unequal magnetic moments of cations, where Ti3+ , Mn3+ , and Co3+ occupy the octahedral, whereas, Co2+ sits in the tetrahedral site. For both compounds an additional weak antiferromagnetic component could be observed lying perpendicular to the ferrimagnetic component. The analysis of static and dynamic magnetic susceptibilities combined with the heat-capacity data reveals a magnetic compensation phenomenon (MCP) at T-COMP = 25.4 K in Ti0.8Mn0.2Co2O4 and a reentrant spin-glass behaviour in Ti0.6Mn0.4Co2O4 with a freezing temperature of 110.1 K. The MCP in this compound is characterized by sign reversal of magnetization and bipolar exchange bias effect below T-COMP with its magnitude depending on the direction of external magnetic field and the cooling protocol.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- neutron diffraction
- ferrimagnetism
- Jahn-Teller distortion
- magnetic compensation
- spin-glass
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas