Unusually large magnetic moment and tricritical behavior of the CMR compound NaCr2O4 revealed with high resolution neutron diffraction and SR
The mixed valence Cr ^3+ /Cr ^4+ compound NaCr _2 O _4 , hosts a plethora of unconventional electronic properties. In the present study, muon spin rotation/relaxation ( $\mu^+$ SR) and high-resolution time-of-flight neutron powder diffraction measurements were carried out on high-quality samples to...
| मुख्य लेखकों: | , , , , , , , , , , , , |
|---|---|
| स्वरूप: | लेख |
| भाषा: | English |
| प्रकाशित: |
IOP Publishing
2023-01-01
|
| श्रृंखला: | JPhys Materials |
| विषय: | |
| ऑनलाइन पहुंच: | https://doi.org/10.1088/2515-7639/acdf21 |
| _version_ | 1827908949192474624 |
|---|---|
| author | Elisabetta Nocerino Ola Kenji Forslund Hiroya Sakurai Akinori Hoshikawa Nami Matsubara Daniel Andreica Anton Zubayer Federico Mazza Takashi Saito Jun Sugiyama Izumi Umegaki Yasmine Sassa Martin Månsson |
| author_facet | Elisabetta Nocerino Ola Kenji Forslund Hiroya Sakurai Akinori Hoshikawa Nami Matsubara Daniel Andreica Anton Zubayer Federico Mazza Takashi Saito Jun Sugiyama Izumi Umegaki Yasmine Sassa Martin Månsson |
| author_sort | Elisabetta Nocerino |
| collection | DOAJ |
| description | The mixed valence Cr ^3+ /Cr ^4+ compound NaCr _2 O _4 , hosts a plethora of unconventional electronic properties. In the present study, muon spin rotation/relaxation ( $\mu^+$ SR) and high-resolution time-of-flight neutron powder diffraction measurements were carried out on high-quality samples to clarify the complex magnetic ground state of this unique material. We identified a commensurate canted antiferromagnetic order (C-AFM) with a canting angle of the Cr spin axial vector equal to $\theta_{\mathrm{c}} = (8.8\pm0.5)^{\circ}$ , and an estimated Cr moment $\mu^{\mathrm{C}}_{\mathrm{Cr}} \sim (4.30\pm0.01)\mu_\mathrm{B}$ . Such an unusually large value of $\mu^{\mathrm{C}}_{\mathrm{Cr}}$ is compatible with the existence of high-spin Cr sites created by the presence of an unconventional negative charge transfer state in NaCr _2 O _4 . In addition to the C-AFM structure, a novel magnetic supercell was also revealed. Such supercell display an incommensurate (IC)-AFM propagation vector (0 0 ${\textstyle \frac{1}{2}-}\delta$ ), having a Cr moment $\mu^{\mathrm{IC}}_{\mathrm{Cr}} = (2.20\pm0.03)\mu_\mathrm{B}$ . It is suggested that the C-AFM and IC-AFM modulations have two different electronic origins, being due to itinerant and localized contributions to the magnetic moment respectively. Finally, the direct measurement of the magnetic order parameter for the C-AFM structure provided a value of the critical exponent $\beta = 0.245 \approx \frac{1}{4}$ , suggesting a non conventional critical behavior for the magnetic phase transition in NaCr _2 O _4 . |
| first_indexed | 2024-03-13T01:29:32Z |
| format | Article |
| id | doaj.art-d9037ce1179f4120959b51fac8af7318 |
| institution | Directory Open Access Journal |
| issn | 2515-7639 |
| language | English |
| last_indexed | 2024-03-13T01:29:32Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | JPhys Materials |
| spelling | doaj.art-d9037ce1179f4120959b51fac8af73182023-07-04T09:30:26ZengIOP PublishingJPhys Materials2515-76392023-01-016303500910.1088/2515-7639/acdf21Unusually large magnetic moment and tricritical behavior of the CMR compound NaCr2O4 revealed with high resolution neutron diffraction and SRElisabetta Nocerino0https://orcid.org/0000-0003-4441-8882Ola Kenji Forslund1Hiroya Sakurai2Akinori Hoshikawa3Nami Matsubara4Daniel Andreica5Anton Zubayer6Federico Mazza7Takashi Saito8Jun Sugiyama9Izumi Umegaki10Yasmine Sassa11https://orcid.org/0000-0003-1416-5642Martin Månsson12KTH Royal Institute of Technology, Department of Applied Physics, Alba Nova University Center , Stockholm SE-114 21, SwedenChalmers University of Technology, Department of Physics , Göteborg SE-412 96, SwedenNational Institute for Materials Science , Namiki, Tsukuba, Ibaraki 305-0044, JapanFrontier Research Center for Applied Atomic Sciences, Ibaraki University , 162-1 Shirakata, Tokai, Ibaraki 319-1106, JapanKTH Royal Institute of Technology, Department of Applied Physics, Alba Nova University Center , Stockholm SE-114 21, SwedenFaculty of Physics, Babes-Bolyai University , 3400 Cluj-Napoca, RomaniaDepartment of Physics, Chemistry and Biology (IFM), Linköping University , SE-581 83 Linköping, SwedenInsitute of Solid State Physics, TU Wien , Wiedner Haupstraße 8-10, AT-1040 Wien, AustriaInstitute of Materials Structure Science, High Energy Accelerator Research Organization , 203-1 Shirakata, Tokai, Ibaraki 319-1107, JapanNeutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS) , Tokai, Ibaraki 319-1106, Japan; Advanced Science Research Center, Japan Atomic Energy Agency , Tokai, Ibaraki 319-1195, JapanMuon Science Laboratory, Institute of Materials Structure Science, KEK , Tokai, Ibaraki 319-1106, JapanChalmers University of Technology, Department of Physics , Göteborg SE-412 96, SwedenKTH Royal Institute of Technology, Department of Applied Physics, Alba Nova University Center , Stockholm SE-114 21, SwedenThe mixed valence Cr ^3+ /Cr ^4+ compound NaCr _2 O _4 , hosts a plethora of unconventional electronic properties. In the present study, muon spin rotation/relaxation ( $\mu^+$ SR) and high-resolution time-of-flight neutron powder diffraction measurements were carried out on high-quality samples to clarify the complex magnetic ground state of this unique material. We identified a commensurate canted antiferromagnetic order (C-AFM) with a canting angle of the Cr spin axial vector equal to $\theta_{\mathrm{c}} = (8.8\pm0.5)^{\circ}$ , and an estimated Cr moment $\mu^{\mathrm{C}}_{\mathrm{Cr}} \sim (4.30\pm0.01)\mu_\mathrm{B}$ . Such an unusually large value of $\mu^{\mathrm{C}}_{\mathrm{Cr}}$ is compatible with the existence of high-spin Cr sites created by the presence of an unconventional negative charge transfer state in NaCr _2 O _4 . In addition to the C-AFM structure, a novel magnetic supercell was also revealed. Such supercell display an incommensurate (IC)-AFM propagation vector (0 0 ${\textstyle \frac{1}{2}-}\delta$ ), having a Cr moment $\mu^{\mathrm{IC}}_{\mathrm{Cr}} = (2.20\pm0.03)\mu_\mathrm{B}$ . It is suggested that the C-AFM and IC-AFM modulations have two different electronic origins, being due to itinerant and localized contributions to the magnetic moment respectively. Finally, the direct measurement of the magnetic order parameter for the C-AFM structure provided a value of the critical exponent $\beta = 0.245 \approx \frac{1}{4}$ , suggesting a non conventional critical behavior for the magnetic phase transition in NaCr _2 O _4 .https://doi.org/10.1088/2515-7639/acdf21neutron diffractionmuon spin rotationunconventional magnetismcolossal magnetoresistance |
| spellingShingle | Elisabetta Nocerino Ola Kenji Forslund Hiroya Sakurai Akinori Hoshikawa Nami Matsubara Daniel Andreica Anton Zubayer Federico Mazza Takashi Saito Jun Sugiyama Izumi Umegaki Yasmine Sassa Martin Månsson Unusually large magnetic moment and tricritical behavior of the CMR compound NaCr2O4 revealed with high resolution neutron diffraction and SR JPhys Materials neutron diffraction muon spin rotation unconventional magnetism colossal magnetoresistance |
| title | Unusually large magnetic moment and tricritical behavior of the CMR compound NaCr2O4 revealed with high resolution neutron diffraction and SR |
| title_full | Unusually large magnetic moment and tricritical behavior of the CMR compound NaCr2O4 revealed with high resolution neutron diffraction and SR |
| title_fullStr | Unusually large magnetic moment and tricritical behavior of the CMR compound NaCr2O4 revealed with high resolution neutron diffraction and SR |
| title_full_unstemmed | Unusually large magnetic moment and tricritical behavior of the CMR compound NaCr2O4 revealed with high resolution neutron diffraction and SR |
| title_short | Unusually large magnetic moment and tricritical behavior of the CMR compound NaCr2O4 revealed with high resolution neutron diffraction and SR |
| title_sort | unusually large magnetic moment and tricritical behavior of the cmr compound nacr2o4 revealed with high resolution neutron diffraction and sr |
| topic | neutron diffraction muon spin rotation unconventional magnetism colossal magnetoresistance |
| url | https://doi.org/10.1088/2515-7639/acdf21 |
| work_keys_str_mv | AT elisabettanocerino unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT olakenjiforslund unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT hiroyasakurai unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT akinorihoshikawa unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT namimatsubara unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT danielandreica unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT antonzubayer unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT federicomazza unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT takashisaito unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT junsugiyama unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT izumiumegaki unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT yasminesassa unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr AT martinmansson unusuallylargemagneticmomentandtricriticalbehaviorofthecmrcompoundnacr2o4revealedwithhighresolutionneutrondiffractionandsr |