Importance of Epitaxial Strain at a Spin-Crossover Molecule–Metal Interface
Cynthia Fourmental
(1)
,
Sourav Mondal
(2)
,
Rajdeep Banerjee
(2)
,
Amandine Bellec
(1)
,
Yves Garreau
(1)
,
Alessandro Coati
(3)
,
Cyril Chacon
(1)
,
Yann Girard
(1)
,
Jerome Lagoute
(1)
,
Sylvie Rousset
(1)
,
Marie-Laure Boillot
(4)
,
Talal Mallah
(5)
,
Cristian Enachescu
(6)
,
Cyril Barreteau
(7)
,
Yann Dappe
(7)
,
Alexander Smogunov
(7)
,
Shobhana Narasimhan
(8)
,
Vincent Repain
(1)
1
MPQ (UMR_7162) -
Laboratoire Matériaux et Phénomènes Quantiques
2 JNCASR - Jawaharlal Nehru Centre for Advanced Scientific Research
3 SSOLEIL - Synchrotron SOLEIL
4 ICMMO - Institut de Chimie Moléculaire et des Matériaux d'Orsay
5 LCI - Laboratoire de chimie inorganique
6 Department of Solid State and Theoretical Physics
7 GMT - Groupe Modélisation et Théorie
8 Theoretical Sciences Unit
2 JNCASR - Jawaharlal Nehru Centre for Advanced Scientific Research
3 SSOLEIL - Synchrotron SOLEIL
4 ICMMO - Institut de Chimie Moléculaire et des Matériaux d'Orsay
5 LCI - Laboratoire de chimie inorganique
6 Department of Solid State and Theoretical Physics
7 GMT - Groupe Modélisation et Théorie
8 Theoretical Sciences Unit
Amandine Bellec
- Fonction : Auteur
- PersonId : 735579
- IdHAL : amandine-bellec
- ORCID : 0000-0001-7410-9736
- IdRef : 130673951
Yves Garreau
- Fonction : Auteur
- PersonId : 759451
- ORCID : 0000-0002-7594-0262
Alessandro Coati
- Fonction : Auteur
- PersonId : 1146368
- ORCID : 0000-0001-7732-5688
Cyril Chacon
- Fonction : Auteur
- PersonId : 848600
- IdHAL : cyrilchacon-carrillo
Yann Girard
- Fonction : Auteur
- PersonId : 738803
- IdHAL : yann-girard
- ORCID : 0000-0001-5708-4338
- IdRef : 151158940
Jerome Lagoute
- Fonction : Auteur
- PersonId : 738548
- IdHAL : jerome-lagoute
- ORCID : 0000-0002-0568-6991
- IdRef : 074446193
Sylvie Rousset
- Fonction : Auteur
- PersonId : 170520
- IdHAL : sylvie-rousset
- ORCID : 0000-0001-9827-4402
- IdRef : 089052056
Marie-Laure Boillot
- Fonction : Auteur
- PersonId : 740795
- IdHAL : marie-laure-boillot
- ORCID : 0000-0001-6710-4523
- IdRef : 145847691
Talal Mallah
- Fonction : Auteur
- PersonId : 751446
- IdHAL : talalmallah
- ORCID : 0000-0002-9311-3463
- IdRef : 032901194
Cristian Enachescu
- Fonction : Auteur
- PersonId : 756774
- ORCID : 0000-0001-5173-5451
Alexander Smogunov
- Fonction : Auteur
- PersonId : 1188411
- ORCID : 0000-0003-2398-3073
- IdRef : 189548746
Résumé
Spin-crossover molecules are very appealing for use in multifunctional spintronic devices because of their ability to switch between high-spin and low-spin states with external stimuli such as voltage and light. In actual devices, the molecules are deposited on a substrate, which can modify their properties. However, surprisingly little is known about such molecule–substrate effects. Here we show for the first time, by grazing incidence X-ray diffraction, that an FeII spin-crossover molecular layer displays a well-defined epitaxial relationship with a metal substrate. Then we show, by both density functional calculations and a mechanoelastic model, that the resulting epitaxial strain and the related internal pressure can induce a partial spin conversion at low temperatures, which has indeed been observed experimentally. Our results emphasize the importance of substrate-induced spin state transitions and raise the possibility of exploiting them.