000063179 001__ 63179
000063179 005__ 20171117104914.0
000063179 0247_ $$2doi$$a10.1103/PhysRevLett.112.117202
000063179 0248_ $$2sideral$$a100143
000063179 037__ $$aART-2014-100143
000063179 041__ $$aeng
000063179 100__ $$aMorello, A.
000063179 245__ $$aObservation of zero-point quantum fluctuations of a single-molecule magnet through the relaxation of its nuclear spin bath
000063179 260__ $$c2014
000063179 5060_ $$aAccess copy available to the general public$$fUnrestricted
000063179 5203_ $$aA single-molecule magnet placed in a magnetic field perpendicular to its anisotropy axis can be truncated to an effective two-level system, with easily tunable energy splitting. The quantum coherence of the molecular spin is largely determined by the dynamics of the surrounding nuclear spin bath. Here we report the measurement of the nuclear spin-lattice relaxation rate 1/T1n in a single crystal of the single-molecule magnet Mn12-ac, at T˜30 mK in perpendicular fields B¿ up to 9 T. The relaxation channel at B˜0 is dominated by incoherent quantum tunneling of the Mn12-ac spin S, aided by the nuclear bath itself. However for B¿>5 T we observe an increase of 1/T1n by several orders of magnitude up to the highest field, despite the fact that the molecular spin is in its quantum mechanical ground state. This striking observation is a consequence of the zero-point quantum fluctuations of S, which allow it to mediate the transfer of energy from the excited nuclear spin bath to the crystal lattice at much higher rates. Our experiment highlights the importance of quantum fluctuations in the interaction between an "effective two-level system" and its surrounding spin bath.
000063179 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000063179 590__ $$a7.512$$b2014
000063179 591__ $$aPHYSICS, MULTIDISCIPLINARY$$b6 / 78 = 0.077$$c2014$$dQ1$$eT1
000063179 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000063179 700__ $$0(orcid)0000-0003-0828-3212$$aMillán, A.$$uUniversidad de Zaragoza
000063179 700__ $$aDe Jongh, L. J.
000063179 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDepartamento de Física de la Materia Condensada$$cFísica de la Materia Condensada
000063179 773__ $$g112, 11 (2014), 117202 [5 pp]$$pPhys. rev. lett.$$tPHYSICAL REVIEW LETTERS$$x0031-9007
000063179 8564_ $$s1256737$$uhttps://zaguan.unizar.es/record/63179/files/texto_completo.pdf$$yVersión publicada
000063179 8564_ $$s119883$$uhttps://zaguan.unizar.es/record/63179/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000063179 909CO $$ooai:zaguan.unizar.es:63179$$particulos$$pdriver
000063179 951__ $$a2017-11-16-10:49:04
000063179 980__ $$aARTICLE