Magnetic phase transition in the itinerant helimagnet MnSi: Thermodynamic and transport properties
نویسندگان
چکیده
A careful study of thermodynamic and transport properties of a high-quality single crystal of MnSi at ambient pressure suggests that its transition to a helical magnetic state near 29 K is weakly first order. The heat capacity, temperature derivative of resistivity, thermal expansion, and magnetic susceptibility exhibit a specific structure around the phase transition point, interpreted as a combination of firstand second-order features. Striking mirror symmetry between the temperature derivative of resistivity and the thermal expansion coefficient is observed. Conclusions drawn from these experiments question prevailing views on the phase diagram of MnSi. Disciplines Condensed Matter Physics | Metallurgy Comments This article is from Physical Review B 76 (2007): 052405, doi:10.1103/PhysRevB.76.052405. Authors Sergei M. Stishov, Alla E. Petrova, S. Khasonov, G. Kh. Panova, Anatoly A. Shikov, Jason C. Lashley, D. Wu, and Thomas A. Lograsso This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/ameslab_pubs/77 Magnetic phase transition in the itinerant helimagnet MnSi: Thermodynamic and transport properties S. M. Stishov,1,* A. E. Petrova,1 S. Khasanov,2 G. Kh. Panova,3 A. A. Shikov,3 J. C. Lashley,4 D. Wu,5 and T. A. Lograsso5 1Institute for High Pressure Physics, Troitsk, Moscow Region, Russia 2Institute of Solid State Physics, Chernogolovka, Moscow Region, Russia 3Russian Research Center Kurchatov Institute, Moscow, Russia 4Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 5Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA Received 8 June 2007; revised manuscript received 3 July 2007; published 16 August 2007 A careful study of thermodynamic and transport properties of a high-quality single crystal of MnSi at ambient pressure suggests that its transition to a helical magnetic state near 29 K is weakly first order. The heat capacity, temperature derivative of resistivity, thermal expansion, and magnetic susceptibility exhibit a specific structure around the phase transition point, interpreted as a combination of firstand second-order features. Striking mirror symmetry between the temperature derivative of resistivity and the thermal expansion coefficient is observed. Conclusions drawn from these experiments question prevailing views on the phase diagram
منابع مشابه
Non-Fermi Liquid Behavior in a Weak Itinerant Ferromagnet MnSi
MnSi is a weak itinerant helimagnet with a relatively low order magnetic moment. Temperature dependance of resistivity shows that it enters non-Fermi liquid state above a critical pressure pc which remains to be understood. The observed partial magnetic order above pc indicates novel metallic state. Here, Fermi liquid and non-Fermi liquid theories are discussed with the main focus on the temper...
متن کاملChirality induced anomalous-Hall effect in helical spin crystals
Under pressure, the itinerant helimagnet MnSi displays unusual magnetic properties. We have previously discussed a BCC helical spin crystal as a promising starting point for describing the high pressure phenomenology. This state has topologically nontrivial configurations of the magnetization field. Here we note the consequences for magneto-transport that arise generally from such spin textures...
متن کاملQuantum order-by-disorder near criticality and the secret of partial order in MnSi.
The vicinity of quantum phase transitions has proven fertile ground in the search for new quantum phases. We propose a physically motivated and unifying description of phase reconstruction near metallic quantum-critical points using the idea of quantum order by disorder. Certain deformations of the Fermi surface associated with the onset of competing order enhance the phase space available for ...
متن کاملElectron localization into spin-polaron state in MnSi
Strong electron localization into a bound state has been found in both paramagnetic and ferromagnetic states of the transition metal compound MnSi by muon spin-rotation spectroscopy in magnetic fields up to 7 T and from 2 K to room temperature. This bound state, with a characteristic radius R≈0.4 nm and net spin S=24±2, is consistent with confinement of the electron’s wave function within rough...
متن کاملQuantum phase transitions of magnetic rotons.
Because of weak spin-orbit coupling and broken inversion symmetry the paramagnons of an itinerant, almost ferromagnetic system become magnetic rotons. Using self-consistent Hartree and renormalization group calculations, we study weak fluctuation-driven first-order quantum phase transitions, a quantum tricritical point controlled by anisotropy, and non-Fermi liquid behavior associated with the ...
متن کامل