Charge density wave like behavior with magnetic ordering in orthorhombic S m2R u3G e5
Abstract
In order to explore the physical properties of orthorhombic U2C o3S i5 -type S m2R u3G e5 , we have carried out a combined study by means of the measurements of the magnetic susceptibility χ, electrical resistivity ρ, Seebeck coefficient S, and specific heat Cp. An antiferromagnetic phase transition at the Néel temperature TN≃7 K has been identified by all measured physical quantities. Remarkably, another intrinsic phase transition characterized by marked features has been discerned at T*≃240 K . The distinct peak in Cp at T* with the lack of thermal hysteresis behavior provides strong evidence for the second-order phase transition in nature. It is noticed that the observations near T* are reminiscent of a typical charge density wave (CDW) ordering. We compared the experimental results with those observed in a polymorph of S m2R u3G e5 with the tetragonal S c2F e3S i5 -type structure which was recently reported to exhibit the coexistence of magnetic and CDW phase transitions. On this basis, the observed features in orthorhombic S m2R u3G e5 have been discussed by comparing with the results in tetragonal S m2R u3G e5 as well as other CDW systems.
- Publication:
-
Physical Review B
- Pub Date:
- April 2020
- DOI:
- 10.1103/PhysRevB.101.155140
- Bibcode:
- 2020PhRvB.101o5140K