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Light-induced thermal hysteresis and high-spin low-spin domain formation evidenced by optical microscopy in a spin-crossover single crystal

hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
dc.contributor.authorFOURATI, Houcem
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
dc.contributor.authorNDIAYE, Mamadou
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
hal.structure.identifierDepartment of Physics [Ziguinchor]
dc.contributor.authorSY, Mouhamadou
hal.structure.identifierChimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
dc.contributor.authorTRIKI, Smail
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHASTANET, Guillaume
hal.structure.identifierCristallographie, Résonance Magnétique et Modélisations [CRM2]
dc.contributor.authorPILLET, Sébastien
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
dc.contributor.authorBOUKHEDDADEN, Kamel
dc.date.issued2022-05-31
dc.identifier.issn2469-9950
dc.description.abstractEnThe low-temperature photoinduced effects of the spin-crossover [{Fe(2−pytrz)2[Pd(CN)4]}].3H2O single crystal have been investigated by means of a cryogenic optical microscopy technique down to 10 K from which the imaging and quantitative analysis of the spatiotemporal transformation are derived. The magnetic investigations revealed that this compound exhibits an incomplete spin transition between a full high-spin (HS) state at high temperature and an intermediate HS and low-spin (LS) state, where HS and LS species coexist, as a result of the existence of an elastic frustration at the molecular scale, most likely caused by the rigidity of the interconnected [Pd(CN)4] [Fe(II)/Pd(II)] two-dimensional network. At low temperature (10 K), thanks to reverse light-induced excited spin-state trapping effect, we could switch the system from the intermediate HS-LS state to the fully photoinduced LS state by irradiating the sample in near-infrared region, revealed by photomagnetic and optical microscopy studies. Optical microscopy images showed monotonous and homogeneous transformation of the crystal color along this process, corresponding to a gradual change of the spin state under light. In contrast, the thermal relaxation in the dark of this photoinduced LS-LS state shows a transition to the intermediate HS-LS state at ∼90 K with domain formation, which is characteristic of a first-order transition at equilibrium. Interestingly, the same behavior is also obtained during the heating process of the reverse light-induced thermal hysteresis cycle with a heating branch almost unchanged, confirming that light does not act on this transition. It is then concluded that the transition from the full LS to the intermediate HS-LS transition is of first order and therefore the LS state reached by light is a hidden stable state of the system until ∼90 K. These experimental results are modeled using an adapted version of the electroelastic model including photoexcitation effects and solved by Monte Carlo method. Both thermal equilibrium and light-induced thermal hysteresis are reproduced, in fair qualitative agreement with the experimental data of photomagnetism and optical microscopy.
dc.description.sponsorshipDes Complexes Moléculaires aux Solides Synergiques Multi-Commutables et Fluorescents - ANR-20-CE07-0028
dc.language.isoen
dc.publisherAmerican Physical Society
dc.title.enLight-induced thermal hysteresis and high-spin low-spin domain formation evidenced by optical microscopy in a spin-crossover single crystal
dc.typeArticle de revue
dc.identifier.doi10.1103/physrevb.105.174436
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]
dc.subject.halChimie
dc.subject.halSciences de l'ingénieur [physics]
bordeaux.journalPhysical Review B
bordeaux.page174436 (16 p.)
bordeaux.volume105
bordeaux.peerReviewedoui
hal.identifierhal-03689350
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03689350v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical%20Review%20B&rft.date=2022-05-31&rft.volume=105&rft.spage=174436%20(16%20p.)&rft.epage=174436%20(16%20p.)&rft.eissn=2469-9950&rft.issn=2469-9950&rft.au=FOURATI,%20Houcem&NDIAYE,%20Mamadou&SY,%20Mouhamadou&TRIKI,%20Smail&CHASTANET,%20Guillaume&rft.genre=article


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