Charge density wave like behavior with magnetic ordering in orthorhombic Sm2Ru3Ge5

It Runs in the BaAl4 Family: Relating the Structure and Properties of Middle Child Ln2Co3Ge5 (Ln = Pr, Nd, and Sm) to its Siblings LnCo2Ge2 and LnCoGe3

“…Ln 2 M 3 Ge 5 (Ln = lanthanide element; M = transition metal) is rich in intriguing physical phenomena, with La 2 Pt 3 Ge 5 showing superconductivity and Pr 2 Pt 3 Ge 5 showing superconductivity and antiferromagnetism. − Another highlight is Sm 2 Ru 3 Ge 5 , which adopts two different polymorphs: one in the Sc 2 Fe 3 Si 5 structure type ( P 4/ mnc ) and the other in the U 2 Co 3 Si 5 structure type ( Ibam ). Each polymorph shows charge density wave order: one at 175 °C and the other at 240 °C, respectively. , There are six different structure types reported for intermetallic tetrels with the formula Ln 2 M 3 X 5 : two of which are the orthorhombic U 2 Co 3 Si 5 and the monoclinic Lu 2 Co 3 Si 5 -type structures, both distorted supercells of the BaAl 4 prototype . Ce 2 Co 3 Ge 5 has been identified in the U 2 Co 3 Si 5 structure type, and its transport and magnetic properties are well reported in powder samples, with Ce understood to be valence instable. , The Pr , and Nd analogues, however, have been previously identified in both the orthorhombic U 2 Co 3 Si 5 and monoclinic Lu 2 Co 3 Si 5 ( C 2/ c ) structure types. , The Sm analogue adopts the monoclinic structure .…”

“…Each polymorph shows charge density wave order: one at 175 °C and the other at 240 °C, respectively. 9,10 There are six different structure types reported for intermetallic tetrels with the formula Ln 2 M 3 X 5 : 11 two of which are the orthorhombic U 2 Co 3 Si 5 12 and the monoclinic Lu 2 Co 3 Si 5 -type structures, 13 both distorted supercells of the BaAl 4 prototype. 14 Ce 2 Co 3 Ge 5 has been identified in the U 2 Co 3 Si 5 structure type, and its transport and magnetic properties are well reported in powder samples, with Ce understood to be valence instable.…”

Modulated crystal structure of the atypical charge density wave state of single-crystal Lu2Ir3Si5

“…However, CDWs have been discovered in a large number of compounds which do not belong to this category. Examples include α-uranium [7], CuV 2 S 4 [8][9][10][11], La 3 Co 4 Sn 13 [12][13][14], RTe 3 (R = La, Sm, Gd, Tb, Dy, Ho, Er, and Tm) [15][16][17], RTe 2 (R = La and Ce) [18,19], R 5 Ir 4 Si 10 (R = Dy, Ho, Er, Yb, and Lu) [5], and Sm 2 Ru 3 Ge 5 [20]. Temperature-dependent single-crystal x-ray diffraction (SXRD) experiments have established multiple phase transitions with incommensurate and commensurate CDWs in several compounds RNiC 2 (R = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, and Tm) [2,[21][22][23][24][25][26].…”

Anisotropic magnetic and transport properties of orthorhombic o-Pr2Co3Ge5

“…The Ln 2 M 3 X 5 (Ln = lanthanide or actinide; M = transition metal; X = Ga, Si, Ge, Sn) family of intermetallic compounds is rich in complex magnetic and strongly correlated electron behavior. This includes charge density waves in Sm 2 Ru 3 Ge 5 and Nd 2 Ru 3 Ge 5 [1,2], superconductivity in Y 2 Ir 3 Ge 5 and La 2 Ir 3 Ge 5 [3][4][5], Kondo lattice behavior in Ce 2 Rh 3 Ge 5 , Ce 2 Ir 3 Ge 5 , and Yb 2 Ir 3 Ge 5 [6][7][8], competition between ferromagnetic and antiferromagnetic ordering in Pr 2 Ni 3 Si 5 , Ho 2 Ni 3 Si 5 , and Tb 2 Co 3 Ge 5 [9][10][11][12], intermediate/mixed valance states in Ce 2 Co 3 Ge 5 , Ce 2 Re 3 Si 5 , and Eu 2 Pt 3 Si 5 [13][14][15][16], and pressure induced quantum critical behavior in Ce 2 Ni 3 Ge 5 [17,18]. The Pr 2 M 3 Ge 5 (M = Co [19], Ni [20], Ru [19], Rh [19], Pd, Ir [3,19], Pt) compounds show many exotic phenomena such as charge density waves and polymorphism in Pr 2 Ru 3 Ge 5 [1], heavy electron behavior in Pr 2 Rh 3 Ge 5 [21], and magnetoresistance of nearly ten-fold increase in Pr 2 Pd 3 Ge 5 [21], A superconducting transition has been observed in Pr 2 Pt 3 Ge 5 at T SC = 6.7 K, coexisting with two antiferromagnetic transitions below T = 5 K [5,22,23] and non-Fermi liquid behavior, suggesting a field dependent quantum critical point [24].…”