Nofs ta' kelma

Ġabra ta’ poeżiji u proża li tinkludi: Alla kbir bla qies! ta’ R. M. B. – Tantum ergo – Lil kewkba feġġa – Għajjiena le xebagħna ta’ Ros. Briffa – Sliem ta’ Dun Karm – Kewkba ta’ Dun Karm – Nofs ta’ kelma ta’ A. C.N/

Ottubru

Ġabra ta’ poeżiji u proża li tinkludi: Lil San Pawl ta’ Dun Karm – Il-Ġid u d-Deni ta’ J. C. – Il-Gass ta’ Dun Karm – Ħolm ir-Ramla tan-Nadur ta’ Kr. Vella Ħaber – Dawl ta’ Tama ta’ Ġużi Chetcuti – Ottubru ta’ R. P.N/

Tallaba

Ġabra ta’ poeżiji u proża li tinkludi: Il-Bravi fid-Dar ta’ Luċija ta’ Dun Pawl – X’Qasma ta’ Qalb ta’ C. M. D – Innu ta’ G. M. A. – Ġens il-Malti ta’ R. Briffa – It-Tallaba minn ta’ Matilde Serao ta’ Ġużè Micallef GoggiN/

Qalb ta’ Tifel

Ġabra ta’ poeżiji u proża li tinkludi: Lil Malta ta’ Dun Karm – Fuq il-Fruntiera ta’ Dun Karm – Jum li jibqa’ jissemma ta’ Ġużè Chetcuti – Xbihet Malta ta’ Arthur V. Vassallo – Għanja ta’ Mħabba ta’ Ġużè Chetcuti – Żewġ Poeżijiet tal-kittieb Malti Antonio Calleja ta’ A. C. – Twettiqa ta’ Calleja – Lil Ħabib Għeluq Sninu ta’ Calleja – Taħt is-Salib ta’ R. M. B. – Lil Dun Karm ta’ Fran. Camilleri – Frak mill-weraq ta’ Byron ta’ A. C. – Irrid Immur Ta’ Xbiex ta’ Fran. Camilleri – Il-Cottonera fil-Ħamrun ta’ N. Biancardi – Qalb ta’ Tifel ta’ R. M. B.N/

Strong competition between orbital ordering and itinerancy in a frustrated spinel vanadate

The crossover from localized to itinerant electron regimes in the geometrically frustrated spinel system Mn1-x CoxV2O4 is explored by neutron-scattering measurements, first-principles calculations, and spin models. At low Co doping, the orbital ordering (OO) of the localized V3+ spins suppresses magnetic frustration by triggering a tetragonal distortion. At high Co doping levels, however, electronic itinerancy melts the OO and lessens the structural and magnetic anisotropies, thus increasing the amount of geometric frustration for the V-site pyrochlore lattice. Contrary to the predicted paramagentism induced by chemical pressure, the measured noncollinear spin states in the Co-rich region of the phase diagram provide a unique platform where localized spins and electronic itinerancy compete in a geometrically frustrated spinel.open1

Opportunities for mesoscopics in thermometry and refrigeration: Physics and applications

This review presents an overview of the thermal properties of mesoscopic structures. The discussion is based on the concept of electron energy distribution, and, in particular, on controlling and probing it. The temperature of an electron gas is determined by this distribution: refrigeration is equivalent to narrowing it, and thermometry is probing its convolution with a function characterizing the measuring device. Temperature exists, strictly speaking, only in quasiequilibrium in which the distribution follows the Fermi-Dirac form. Interesting nonequilibrium deviations can occur due to slow relaxation rates of the electrons, e.g., among themselves or with lattice phonons. Observation and applications of nonequilibrium phenomena are also discussed. The focus in this paper is at low temperatures, primarily below 4 K, where physical phenomena on mesoscopic scales and hybrid combinations of various types of materials, e.g., superconductors, normal metals, insulators, and doped semiconductors, open up a rich variety of device concepts. This review starts with an introduction to theoretical concepts and experimental results on thermal properties of mesoscopic structures. Then thermometry and refrigeration are examined with an emphasis on experiments. An immediate application of solid-state refrigeration and thermometry is in ultrasensitive radiation detection, which is discussed in depth. This review concludes with a summary of pertinent fabrication methods of presented devices.Comment: Close to the version published in RMP; 59 pages, 35 figure