Hysteresis and change of transition temperature in thin films of Fe{[Me2Pyrz]3BH}2, a new sublimable spin-crossover molecule | Zendy

Vincent Davesne | Zendy; Manuel Gruber | Zendy; Michał Studniarek | Zendy; Won Hui Doh | Zendy; Spyridon Zafeiratos | Zendy; L. Joly | Zendy; Fausto Sirotti | Zendy; Mathieu G. Silly | Zendy; A.B. Gaspar | Zendy; José Antonio Real | Zendy; G. Schmerber | Zendy; Martin Bowen | Zendy; W. Weber | Zendy; S. Boukari | Zendy; V. Da Costa | Zendy; J. Arabski | Zendy; Wulf Wulfhekel | Zendy; Emmanuel Beaurepaire | Zendy

Open Access

Hysteresis and change of transition temperature in thin films of Fe{[Me2Pyrz]3BH}2, a new sublimable spin-crossover molecule

Author(s) -

Vincent Davesne,

Manuel Gruber,

Michał Studniarek,

Won Hui Doh,

Spyridon Zafeiratos,

L. Joly,

Fausto Sirotti,

Mathieu G. Silly,

A.B. Gaspar,

José Antonio Real,

G. Schmerber,

Martin Bowen,

W. Weber,

S. Boukari,

V. Da Costa,

J. Arabski,

Wulf Wulfhekel,

Emmanuel Beaurepaire

Publication year - 2015

Publication title -

the journal of chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.071

H-Index - 357

eISSN - 1089-7690

pISSN - 0021-9606

DOI - 10.1063/1.4921309

Subject(s) - spin crossover , thin film , excited state , materials science , hysteresis , spin transition , absorption (acoustics) , spin (aerodynamics) , condensed matter physics , transition temperature , spin states , nanotechnology , atomic physics , superconductivity , composite material , physics , thermodynamics

Thin films of the spin-crossover (SCO) molecule Fe{[Me2Pyrz]3BH}2 (Fe-pyrz) were sublimed on Si/SiO2 and quartz substrates, and their properties investigated by X-ray absorption and photoemission spectroscopies, optical absorption, atomic force microscopy, and superconducting quantum interference device. Contrary to the previously studied Fe(phen)2(NCS)2, the films are not smooth but granular. The thin films qualitatively retain the typical SCO properties of the powder sample (SCO, thermal hysteresis, soft X-ray induced excited spin-state trapping, and light induced excited spin-state trapping) but present intriguing variations even in micrometer-thick films: the transition temperature decreases when the thickness is decreased, and the hysteresis is affected. We explain this behavior in the light of recent studies focusing on the role of surface energy in the thermodynamics of the spin transition in nano-structures. In the high-spin state at room temperature, the films have a large optical gap (∼5 eV), decreasing at thickness below 50 nm, possibly due to film morphology.

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